(PDF version) – Microsoft Windows Workflow Foundation Cookbook – Educational Textbook Island.Microsoft windows workflow foundation 4.0 cookbook pdf download

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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In the bottom of the designer panel, click the Arguments button, and click Create Argument to create an OutArgument string named OutMessage. Drag two WriteLine activities from Toolbox into the Sequence activity and fill the textboxes with “Start…” and “End” respectively. The following are the httphandler mappings: 86 Chapter 3 According to the httphandler mappings, IIS will use the appropriate handler to handle the WCF request.

That is why the first request will take a little bit longer to get the response. There’s more WCF Windows Communication Foundation is Microsoft’s next-generation unified network programming model for building service-oriented applications.

WCF enables us to build secure, reliable, and distributed solutions with ease. We can work through the following tasks based on the understanding from this task. Of course we will understand the following tasks better if we are already equipped with enough WCF knowledge. This workflow will accept two integer numbers and return their sum to the caller. Create a workflow: Open the default created Service1.

We need to perform the following actions: i. Click the View parameter… link of the ReceiveRequest activity and add two Int32 type service parameters xIn and yIn as shown in the following screenshot: iii.

Right-click the ReceiveRequest activity and select Properties; the properties should be set as shown in the screenshot: 88 Chapter 3 iv. Click the View parameter… link of the SendResponse activity and add an Int32 type service parameter named addResult; refer to the following screenshot: Now, we can save and close the workflow. The final workflow should be like this: 3. Right-click Service1. If you have your Visual Studio installed in your own folder, you can type wcftestclient in the Run command box to search the tool.

Double-click the GetData method, input two numbers for xIn and yIn respectively, and then click the Invoke button. If we can get the addition result, we have successfully created the workflow service. Chapter 3 ii. Set the application’s Physical path to the project folder path: How it works There are two items we need to pay close attention to. We can also add or remove features by editing the Web.

If we want to know how to create and host the workflow service with imperative code, we may refer to the next task. This workflow will accept two integer numbers and return the addition sum to the caller. This workflow is hosted in a console application rather than IIS. Create the workflow in code: Add a new class file to the project and name it ReceiveAndReplyWorkflow. ServiceModel; using System.

Get aec. Add configuration code: Open the App. Create workflow service host code: Set up the workflow host in the Program. Linq; using System. WriteLine “Opening Service Open ; Console. ToString ; Console. Double-click GetData , input two numbers , click the Invoke button, and we will get the result. If we want to create workflow in imperative code, we have to take care of too many things; those are hidden in visual workflow.

On the other hand, creating code workflow will help us understand workflow better. After all, all visual workflow declared as XAML will be compiled to. NET assembly before execution. By using WorkflowService class, we can configure and access the properties of a workflow service. When we set CanCreateInstance property to true, every WCF request will create a new workflow instance to handle each request.

Getting ready For this task, we need to choose one of the previous tasks that we performed as the WF service—Receiving and replying a WCF message or Receiving and replying to a WCF message in code workflow. Find out service information: Before moving to authoring a workflow service client, we need to find out some basic WCF service information—as we stated in the first task of this chapter, the famous ABC of WCF services.

Double-click GetData , input two numbers, click the Invoke button, and we should get the service result. Drag a SendAndReceiveReply activity to the designer panel. Right-click the Send activity and select Properties. Specify four properties of the Send activity. We obtained this information in step 2. Make sure not to use double quotation marks ” ” around the AddressUri property. Just leave it there. Click the Define… link of the Send activity and input the operation parameters’ names, which we obtained in step 2.

Click the Define… link of the ReceiveReplyForSend activity and input the response parameter we obtained in step 2. ToString in the text expression box. Now the workflow should look like the following screenshot: Messaging and Transaction 4. We will see the following: How it works The Send activity enables us to start a conversation with the WCF service.

In the behind stage, the Send activity will fetch the wsdl file according to the endpoint address, and then generate a proxy that can be used to call the WCF service.

So, the Send activity gets many tedious things done and we can use the activity by just performing some configurations. We can use a Send activity alone to send a message without expecting a response, or we can use a Send activity paired with a Receive activity to send a message and wait till a response is received from the service.

In this task, we use the second pattern by dragging the built-in SendAndReceiveReply pattern to the designer panel. There’s more We can also add the WF service to the project service reference and use the service like a local activity.

We can accomplish it by following the next steps: 1. Add a WF service to the project’s service reference. Build the project. Now we can see the WF service operation appearing in the toolbox. Use the GetData activity just like a local activity. Edit the properties of the GetData activity: Messaging and Transaction 6.

Save the workflow and build the project. It is easy to consume a WF service like this; however, there are two drawbacks as follows: ff Visual Studio is needed, which is not available in the customized WF designer by default. While many workflows exist in XAML files and may even be stored in a database, adding references is not an option for standalone workflows.

Getting ready Now that we have finished at least one of the previous tasks—Receiving and replying to a WCF message or Receiving and replying to a WCF message in code workflow—we can choose one of them as the WF service in this task. In this task I will use the code-style WF service. Create workflow host code: Open the Program. Invoke srw. Run it: Follow the steps given next: i. In this task, there are three important activities we need to focus on.

Please note that the Send activity will generate a WCF contract dynamically when it is running. By using these properties, the Send activity is able to establish a “connection” not always connected with WF service. Every ReceiveReply activity will receive messages initiated by a Send activity in the same correlation scope.

Using CancellationScope activity As we know, the Parallel activity will not finish execution until all of its child branches have finished execution.

Sometimes, we want to break the parallel if one of its branch finishes execution and cancel the other branches. To do this, we can use a CancellationScope activity. In this task, we want to order products from two dealers Dealer A and Dealer B at the same time. In this situation, the two dealers are in a competition, and so the one who ships the product faster wins the business. Create a code workflow file: Add to the project a new class file and name it WorkflowWithCancellationScope.

Invoke wcs. Because dealer A uses 6 seconds to ship the product to us, whereas dealer B uses only 5 seconds, we will see the following result: How it works This workflow is simply a Parallel activity with two CancellationScope activities.

By default, a Parallel activity will finish executing once all of its child branches have finished executing. While in this task, we set CompletionCondition to true so that the Parallel will finish if one of its branch runs to its end. Drag a Parallel activity to the workflow designer panel. Right-click the activity and select Properties.

Set the ConpletionCondition property to True: 2. Drag two CancellationScope activities into the Parallel activity. Drag two Sequence activities to the bodies of the two CancellationScope activities respectively.

Drag two Delay activities to the two Sequence activities respectively. Set the left Delay activity’s delay time to 6 seconds and set the right Delay activity’s delay time to 5 seconds.

Add two WriteLine activities below the Delay activities respectively. Input string “DealerA: Your product has been shipped. Add two WriteLine activities to the two CancelationHandler activities. Input string “DealerA, cancel my order” to the left WriteLine activity and input string “DealerB, cancel my order” to the right Writeline activity.

Add references to the project: Add a reference to the System. Tranactions namespace because we are going to use IsolationLevel enumeration in our code. By using this activity, we can insert a row of data into the database that has been created in advance. Fill the file with the following code. Replace the SQL Server connection string with our own one. SqlConnection ; con. CreateCommand ; cmd. Get context ; cmd. ExecuteNonQuery ; con.

Create workflow code: Add a new class file in the project and name it TransactionWorkflow. The class will define the workflow structure. GetInstance ; wfApp. WriteLine arg. Message ; return UnhandledExceptionAction. By default, we will see the following: If we open the database table, we will find no data has been inserted into the table.

Next, we have to change the workflow definition TransactionWorkflow. Let’s start from the Program. WriteLine “Attempted to divide by zero exception, database rolled back. In our workflow, the divided-by-zero exception will be handled here. Once an exception occurs, workflow will be terminated and the database rolled back.

Be aware of the fact that the table will be locked during the transaction processing. Serializable By doing this, the database will place locks on all data that is used in a transaction, and will prevent other users from updating and making non-repeatable reads.

Then we need to create a workflow as shown in the following screenshot: Chapter 3 Please note that if we cannot find the InsertDataToDBActivity activity, we need to rebuild the project by pressing F6.

Performing compensation by using Compensable activity Imagine a scenario where we are buying a computer online and money has been deducted from our bank account. Suddenly an unexpected exception occurs, workflow stops, and the purchase gets cancelled. Obviously, such a thing should not happen in real life. If an exception occurs that induces workflow stop, the money should be returned back to our account. In WF4 we can use a Compensable activity to handle such a compensation job.

Create workflow code: Add a new class file to the project and name it CompensationWokflow. We should see this: How it works As soon as the workflow starts, the Writeline activity in the body of CompensableActivity performs its action and prints its message to the control.

Next, the Assign activity will generate a divided-by-zero exception due to the setting of 0 as the value of the Variable num2. Create workflow code: Add a new class file to the project and name it CompensationWorkflow. Create host code: Open the Program. Invoke cw. How could a compensate activity know which CompensableActivity it is going to compensate? We use CompensationToken to link them together.

Performing confirmation by using Confirm activity Like performing compensation, we can also perform confirmation by explicitly using a Confirm activity. Confirmation will also be triggered when workflow is successfully finished. Create workflow code: Add a new class file to the project and name it ConfirmationWorkflow.

Then fill the file with the following code: using System; using System. If we have a careful look at the result, we shall see that compensableActivity1 and compensableActivity2 execute one after the other, and then the confirm activity executes as the confirm activity is linked to CompensableActivity2 by token. The ConfirmationHandler executes and prints a line of message to the console.

When the workflow finishes successfully, the ConfirmationHandler of CompensableActivity1 will take action automatically and print a line of message to the console. Printing collection items In this task, we will customize an activity that can print all collection items to Console Application. Manipulating Collections How to do it 1. Refer to the following screenshot: Open the CollectionPrinter.

Generic; using System. Get context ; if collection. WriteLine item. WriteLine “Collection is empty. Build the project: Build the project so that the custom activity will appear in the toolbox.

Create a visual workflow: To create visual workflow, we need to perform the following actions: i. Open the default created workflow file Workflow1. Drag a Sequence activity to the design panel. Drag a CollectionPrinterActivity activity onto the Sequence activity.

A dialog box will appear asking us to choose type; here we choose String. Click the Imports button and type in System. ObjectModel to imported the namespace System. ObjectModel to this workflow. The following is the final workflow: 5. In this task, we created an activity that can accept generic type Collection object. We will use this activity throughout this chapter.

We need to make sure we have finished this task before moving ahead. There’s more We can also use CollectionPrinterActivity in code-style workflow. To create a corresponding workflow in code, open the Program. Invoke new Workflow1 ; WorkflowInvoker. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinterActivity activity in this task.

Create a visual workflow: We need to perform the following actions: i. Open the Workflow1. ObjectModel to import the System. ObjectModel namespace to this workflow. Drag a Sequence activity to the workflow designer and then drag an AddToCollection activity onto the Sequence activity. Add a new ICollection variable named people to the Sequence’s scope. We can see the workflow shown in the following screenshot: Chapter 4 iii.

Set the properties of the AddToCollection activity as shown in the following screenshot: iv. Set the properties of the CollectionPrinter activity: Manipulating Collections 3.

We will see: How it works The AddToCollection activity will append the new item to the end of the collection object. If we want to insert an item to a specified position, we may need to create our own activity to do this.

There’s more We can also use the AddToCollection activity in code-style workflow. To use AddToCollection in code workflow, open the Program. Invoke new Workflow1 ; Using ClearCollection activity In this task, we will use the ClearCollection activity to clear the content of a collection object. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinter activity in this task.

Create a visual workflow: Perform the following steps in order to create a visual workflow: i. Drag a Sequence activity to the workflow designer and then drag a CollectionPrinter activity to the designer panel two times to add two CollectionPrinter activities to the designer panel.

Next, drag a ClearCollection activity between the two CollectionPinter activities—the type is String. We can see the workflow as shown in the following screenshot: iii. Set the properties of both the CollectionPrinter activities: Chapter 4 iv. Set the properties for the ClearCollection activity: 3. By using this activity, we can remove all collection items, so that we can reuse the collection variable again rather than defining a new one.

Open the program. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinterActivity in this task.

Create a workflow: We need to perform the following tasks to create a workflow: i. Drag a Sequence activity to the workflow designer panel. Next, drag CollectionPrinter activity to the designer panel two times.

Set the properties of both the CollectionPrinter activities: iv. Set the properties of the RemoveFromCollection activity: Chapter 4 3. The Result property of RemoveFromCollection activity indicates whether or not an item is deleted successfully. If the item exists and is deleted by this activity, then the Result property will be assigned a True value.

Generic; System. Invoke new Workflow1 ; Chapter 4 Using ExistsInCollection activity In this task, we will use the ExistsInCollection activity to check whether or not a specified item exists in the collection object. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use CollectionPrinterActivity in this task. Create a workflow: We need to perform the following actions to create a workflow: i. Drag a Sequence activity into the designer panel.

Now drag a WriteLine activity below the ExistsCollection activity. Add a Boolean type variable result to the Sequence’s scope. Set the propertes of the CollectionPrinter activity: iv.

Set the properties of the ExistsInCollection activity: Chapter 4 v. Set the Text property of the WriteLine activity as follows. ToString 3. It is a simple activity by which we can test whether or not a specified item exists in a particular collection object. Please note that we have to set the correct TypeArgument for this activity. WF4 provides some build-in activities that can be used directly in the workflow designer panel.

But many times, we need to create our own activities—for example, an activity that can send e-mail to inform someone about finishing a task or any other important thing. To define our own activity, we should write a class that implements the root abstract Activity or one of its predefined subclasses. Custom Activities The following is the activity modeling class hierarchy diagram: This chapter intends to provide readers not only with some additional activities besides the built-in activities, but also with some concepts on how to build our own activities.

Before moving ahead, please create two projects. The first is the ActivityLibrary project named ActivityLibrary. Delete Workflow1. We will use these two projects throughout this chapter. The ActivityLibrary project is for all customized activities, whereas the WorkflowConsoleApp project is used for testing our customized activities.

The following screenshot shows the project structure: Creating an activity by inheriting the root activity The abstract Activity class is the root of all subactivity classes. In this task, we will create a custom activity inheriting directly from Activity. Customize an Activity: Add a new code file MyActivity. Add a reference to ActivityLibrary: In the WorkflowConsoleApp project, add an assembly reference to ActivityLibrary for us to be able to use these customized activities in the WorkflowConsoleApp project.

Please note that when we add a new workflow to the project, we actually select Activity in the Add New Item dialog. Drag a Sequence activity to the designer panel. Drag a WriteLine activity into the Sequence activity and input Workflow start… in the textbox. Drag MyActivity below the WriteLine activity. Check the Program. We should see the following: How it works The abstract Activity class is a base class for all activities in WF4.

This abstract class defines the basic properties, method, and structure for all activities. We can directly create a concrete activity by inheriting this Activity class. In real workflow applications, when we need a complex flow control activity that was not provided in the built-in activities, we can use this Activity class to create a new one.

We can put our logic code in its Execute method. In this task, we are going to create an activity that will write data to a text file. Then replace all default code with the following code: using System; using System. StreamWriter fileName. Get context ; file. Sleep ; file. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof.

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Start by pressing the button below! Microsoft Windows Workflow Foundation 4. Author: Andrew Zhu. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in посетить страницу case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of download games real football 2013 for pc book to ensure microsoft windows workflow foundation 4.0 cookbook pdf download accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied.

Neither the author, Packt Publishing, nor its dealers or distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide cookboo, information about all the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. ISBN www. Two and half years ago he joined Microsoft. He has been supporting WF4 since its beta1 version. No book cookboook the product of just the author—he just happens to be the one with his name on the cover. A number of people contributed to this book, and it would take windwos space scarface world is yours game download I have to thank each one individually.

I must thank my colleague Steven Cheng and Packt acquisition editor Rashmi Phadnis—without you, I wouldn’t have a chance to write this book. You two stayed with me throughout the writing process.

I cannot imagine what could come out without your help. My thanks also go to the Copy Editor of this title Sanchari Mukherjee. Roundation for your patience and comments. Without your effort, the book would have been full детальнее на этой странице mistakes and incomplete.

Finally, I want to thank my Mom and Dad, thanks for your love and understanding. About the Reviewers Geert van Horrik, after finishing high school indecided fkundation wanted to learn more about software development. During his education microsoft windows workflow foundation 4.0 cookbook pdf download a downloa engineer in university, he wrote a some applications using Delphi.

During his study, one of his open source workfloe became very popular, and he spent most of his time writing new features for this project. After finishing education in Software Engineering microsodt laude, he decided to learn some more about business administration at another university. However, the combination of his addiction to software development and the open source projects made him quit the new study and start a company cookbooi CatenaLogic.

The most important product of CatenaLogic is Updater—a tool to easily deploy new versions of software on all clients. Geert van Horrik is also available as a freelance software developer, and mostly concentrates on the latest technologies such nicrosoft C and WPF. Geert also loves helping games download free cricket for pc 2010 people with software development problems on forums, and foubdation to participate in open source projects microsoft windows workflow foundation 4.0 cookbook pdf download the spare time he has left.

Ryan Vice is an enterprise programmer with 10 years of experience working with Microsoft Enterprise solutions. Over those 10 windkws, he has worked on network security systems, high-volume e-commerce systems, microsoft windows workflow foundation 4.0 cookbook pdf download management systems, and a highvolume financial trading application.

Additionally he has built workflow solutions for a geoseismic system and for a credit counseling management system. He has microsoft windows workflow foundation 4.0 cookbook pdf download with both thick and thin clients and is currently specializing in the WinFX suite of tools.

He also founsation teaches classes on WF throughout Texas. I’d like to thank my father Ken for being a huge inspiration downliad both my career and my family, my mother Telsa for helping me get my career started, my beautiful wife Microsoft windows workflow foundation 4.0 cookbook pdf download for all iwndows support and love over the years and willingness to let winddows spend a lot of my free time tinkering with software technology, my daughter Grace for reminding me of how amazing the simple pleasures in life can be, and my new-born son Dylan for bringing so much more joy and love into our lives.

Therefore, before learning this new framework, it’s important to understand why Microsoft feels it is so important. For WF 4. Microsoft’s ultimate goal is to microsoft windows workflow foundation 4.0 cookbook pdf download a higher rate of adoption of WF and to attempt to make WF an essential component of the enterprise developer’s tool downoad. The questions that most developers and architects, who are first exposed to workflow, will be likely to have winows ff Why do I need it?

These are the questions that need to be answered before mlcrosoft start to learn the details of how to use the WF framework, as learning WF is not a small task and understanding the benefits would go a long way in helping motivate you and your team.

This section of the book will help you better understand the “WHYs” of WF and lay the foundation for the rest of the book, which will allow you to hit the ground running by getting up to speed on the “HOWs” of WF.

This book consists of short, easy-to-understand examples or recipes that show how to take advantage of the many benefits of WF. Fooundation first read will allow you to get familiar with all the various features and extensibility points of the WF 4. After reading this short ckokbook, you will be ready to simplify your enterprise development architectures by taking advantage of this powerful new workflow framework and all of its built-in, out-of-the-box features.

Let’s get to it then… Why workflow? For starters, what kinds of problems does workflow make easier downloaf solve? Let’s suppose you need to build a solution for an accounting firm and that firm wants microsoft windows workflow foundation 4.0 cookbook pdf download have a system built to allow them to provide income tax services.

This system needs to support the following features. How would a system like this be built without using a workflow framework? Our first attempt might be to create a set of web services that support: ff Creating of a client account ff Submitting income tax information for an existing account ff Querying for income tax submissions assigned to an accountant ff Querying for a specific tax читать больше ff Requesting more information from the client about an income tax submission ff Approving the information submitted to indicate that the income tax information is complete and ready for an accountant to make an income tax return to be submitted to the IRS This income tax process could take several weeks or months to complete and so it’s not feasible that we could have a thread on the server waiting for the next input for an account ссылка на подробности arrive.

For this application to scale and work with any type of realistic enterprise volume, we’d have to persist the state of the dpf and when sindows web service request arrives, we’d have to take microsoft windows workflow foundation 4.0 cookbook pdf download kind of identifier account ID or accountant ID and retrieve the current state of the account before we could determine if the call could proceed.

A microsoft windows workflow foundation 4.0 cookbook pdf download can’t submit income tax information before they’ve created an account and the service for submitting income tax information would have to query our persistence store database or whatever we are using to verify this. All of this custom state-management code that would allow for sharing the account data among the various client applications from the various servers would need to be written by the developers including ways to deal with concurrency.

We can’t allow two clients to update the same data at the same time, so we’d have to provide for that in our implementation. Assuming we get all that worked out, what about the parts of this process that aren’t driven by web-services calls?

How are we going to assign clients to accounts after they submit their tax forms? How are we going manage our notifications that will be sent to the clients when: ff We receive their information ff We approve or reject their information ff We need to request more information ff We’ve submitted their taxes to the IRS We’d also need to build a scheduling system and an event pcf or messaging system to help us satisfy these needs.

How do we deal with scalability? One solution microsoft windows workflow foundation 4.0 cookbook pdf download be to break apart the functional components of the application and deploy each one to a different server or adventure pc games free download of servers so that you’d have a server cookbooo ff Cooking dash free pc accounts ff Submitting tax data ff Assigning accountants to clients Founsation this approach would allow us to scale but would make the application logic separated and hard to understand and maintain, as it would be http://replace.me/2585.txt over several deployments on different servers.

The ideal solution would be to have a framework that would allow us to: ff Build our workflow logic in a unified way ff Execute our workflow logic in a distributed way, across several servers ff Allow for easy sharing of and persisting of state without having to worry about concurrency ff Allow for easily windowe events or messages that can drive microsoft windows workflow foundation 4.0 cookbook pdf download logic, including support for scheduling these events or messages ff Allow us to track the history of an account If we had a framework that allowed for all these things, then it might be worth our time to go out and learn how to use that new workflow framework as it would provide us a cownload of built-in benefits that would save us from dwonload to reinvent the microsoft windows workflow foundation 4.0 cookbook pdf download over and over again.

The good news is that this is only part of what Workflow Foundation provides. Coobook addition to helping solve these problems, WF also provides: ff A re-hostable designer to allow us to create administration tools microsoft windows workflow foundation 4.0 cookbook pdf download visualizing and managing our cookvook logic ff Support for parallel processing of cookboo ff Support for creating our own workflow constructs or activities to allow us to model our own domain-specific languages ff An extensible architecture that allows us to provide our own implementations for things such as state persistence, workflow execution tracking, threading, and so on Given all that WF 4.

NET Framework 4. Traditionally, when we design a long-running application, we break a large application downloaad lots of small code blocks to address the business logic and use a database to store the intermediate data. With the growing complexity of logic, managing code blocks and authoring logic workflows becomes difficult. Now, with WF4, we can design and create distributed, long-running programs founvation. The aim of this book is to provide http://replace.me/11732.txt step-by-step guide to help us start WF4 programming.

Every recipe in this book is runnable. What this book covers Chapter 1, Workflow Program, provides recipes that will help us understand basic information about WF4 programming. Chapter 2, Built-in Flow Control Activities, provides recipes that demonstrate the usage of the built-in control activities.

Chapter 3, Messaging and Transaction, provides recipes that demonstrate how to send and receive WCF messages in workflow. The nfs download for pc hot pursuit part of this chapter focuses on applying transactions in a workflow program. Chapter 4, Manipulating Collections, demonstrates how to microsoft windows workflow foundation 4.0 cookbook pdf download collection data in workflow programs with WF4 built-in activities.

Chapter 5, Custom Activities, windoss how to create our own custom activities; the microsoft windows workflow foundation 4.0 cookbook pdf download powerful unit of workflow.

Chapter 6, WF4 Extensions, demonstrates how to use the built-in extensions such as persistence and tracking, and also how to create microsoft windows workflow foundation 4.0 cookbook pdf download own extensions.

This chapter also provides recipes that demonstrate host workflow in ASP. Chapter 8, Custom Workflow Designer, helps us create our own Coobkook workflow designer http://replace.me/20422.txt visual tracking function.

We can also use Windows XP, but it is not recommended. Once we install. To develop WF4 workflow applications, we should also have Visual Studio installed on our computer. Who this book is for If you pcf yourself working with Windows Workflow Microsoft windows workflow foundation 4.0 cookbook pdf download 4. With this book, you will be cookbpok to enhance your applications with flexible workflow capabilities using WF 4. To follow the recipes, you will need to be comfortable with.

Conventions In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning. Code words in pdc are shown as follows: “The ActivityLibrary project is for all customized activities, whereas the WorkflowConsoleApp project is used for testing our customized activities”. Words that you see on dindows screen, in menus, or dialog boxes for example, appear in our text like this: “Click the Invoke button to get the result”.

Warnings or important notes appear in a box like this. Tips and tricks appear like this. Reader feedback Feedback from foudnation readers workfolw always welcome. Let us know what you think about this book— what you liked or may have disliked.

Reader feedback is important for us to develop titles that you really get the dwonload out of. To send us general feedback, simply drop an e-mail to [email protected]and mention the book title in the subject of your message. Customer support Now that you are the downloar owner of a Packt book, we have a number of things to help you to get the most from your purchase.

If you find a mistake in one of our books—maybe a mistake in the text or the code—we would be grateful if you would report this to us. By doing so, you can save other readers from frustration and help us improve subsequent versions of this book. Once your errata are verified, your submission will be accepted and the errata will be uploaded on our website, or added to any list of existing errata, under the Errata section of that title.

WebOct 02,  · @Andrew Zhu, Can you let me know, when the book will be published. I pre-ordered the ebook, but not sure when that will be out. · Hi, Packt told me that they will. WebIt is a fast moving and to-the-point guide, it takes you thru the $ elements it’s good to recognize whilst operating with home windows WF. the diversity of subject matters that . WebIt is a fast moving and to-the-point guide, it takes you thru the real elements you should be aware of while operating with home windows WF. the diversity of subject matters that . WebNo deadline once you receive your Ebook downloadable PDF through your email, you can keep it forever and there is no deadline for using it; Interactive Features Easily highlight .
WebOct 02,  · @Andrew Zhu, Can you let me know, when the book will be published. I pre-ordered the ebook, but not sure when that will be out. · Hi, Packt told me that they will. WebIt is a fast moving and to-the-point guide, it takes you thru the real elements you should be aware of while operating with home windows WF. the diversity of subject matters that . WebThis book provides both step-by-step recipes and relevant background information. it covers all the important aspects of Windows Workflow Foundation the best thing about . WebIt is a fast moving and to-the-point guide, it takes you thru the $ elements it’s good to recognize whilst operating with home windows WF. the diversity of subject matters that .

Windows Workflow Foundation 4. NET Framework 4. WF makes workflow technology available to every single programmer that uses the. It is easy to create long running and distributed programs using WF with the right knowledge. With this book, you will discover that working with workflows is easy. This book provides both step-by-step recipes and relevant background information. It covers all the important aspects of Windows Workflow Foundation 4. The best thing about this book is that all recipes are based on real-world experiences of Andrew Zhu.

This book covers everything you need to know, when working with workflows. Get to grips with flow control activities, messaging, and transaction processes with easy to understand steps followed by explanations. You will quickly learn to use collection and custom WF activities and WF services. Lastly, you will discover how easily you can customize W4 Designer with WF rule engine and others.

Considering workflow programs as imperative programs, we need to think of three fundamental things:. In WF4, we can define a workflow in either managed. There are two kinds of code workflow authoring styles:.

After defining workflows, we can build workflow applications as we build normal. NET applications. Before moving ahead, make sure we have the following installed on our computer:. In this task we will create our first workflow to print “Hello Workflow” to the console application.

A dialog is presented, as shown in the following screenshot. Name the project HelloWorkflow. Name the solution Chapter01 and make sure to create a directory for the solution. Author the workflow program :. First, drag a Sequence activity to the designer from Toolbox , next drag a WriteLine activity into the Sequence activity.

Finally, input “Hello Workflow” in the expression box of the WriteLine activity. We can see in the following screenshot:. The result is as shown in the following screenshot:. The preceding statement starts the workflow. We can open Workflow1. Right-click on Workflow1. All XAML files will be compiled to. We need a copy of Visual Studio installed on our computer to use WF4 Designer, otherwise we can only create workflows by imperative code or by writing pure XAML files.

In this task, we will create the same “HelloWorkflow” function workflow using pure C code, beginning from a Console Application. Create a new Console Application project under the Chapter01 solution. Name the project HelloCodeWorkflow. The following screenshot shows the Console Application new project dialog:.

Add reference to the System. Activities assembly :. By default, a new Console Application doesn’t have reference to the System. Activities assembly, due to which we need to perform this step. Create workflow definition code :. As expected, the result should be just like the previous result shown. Because WorflowInvoker class belongs to System.

Activities namespace. Sequence activity, WriteLine activity belongs to System. This code statement loads a workflow instance up and runs it automatically. The WorkflowInvoker. Invoke method is synchronous and invokes the workflow on the same thread as the caller. WF4 also provides us a class DynamicActivity by which we can create a workflow instance dynamically in the runtime. In other words, by using DynamicActivity , there is no need to define a workflow class before initializing a workflow instance.

Here is some sample code:. In this task, we will create a WF program that accepts arguments when initialized in the WF host.

In WF4, we can use InArguments to define the way data flows into an activity. Create a new Workflow Console Application under the Chapter01 solution. Name the project UseInArgument. Author the WF program :. Write code to host the workflow. The application should run in a console window and print the following message:. FirstName is an InArgument type , but how can we assign a string to InArgument without any explicit cast? This is because InArgument is declared with an attribute System.

TypeConverterAttribute System. The class inheritance is shown in the following diagram:. This also applies to WF4. If we are creating workflows using imperative code, we can use InArgument in the following way:.

Create a workflow project :. Drag a Sequence activity from Toolbox to the designer panel. In the bottom of the designer panel, click the Arguments button, and click Create Argument to create an OutArgument string named OutMessage. Drag two WriteLine activities from Toolbox into the Sequence activity and fill the textboxes with “Start…” and “End” respectively. Drag an Assign activity from Toolbox to the designer panel.

Fill the right expression box with OutArgument as OutMessage , whereas fill the right expression box with the following string: This is a message from workflow. Set UseOutArgument as Startup project.

The application should run in a console window and print the message as shown in the next screenshot:. OutMessage is the name of OutArgument we defined in Workflow1. Invoke method will return a IDictionary type object. There is a third type of workflow argument: InOutArgument. It is a binding terminal that represents the flow of data into and out of an activity. But there are still some differences—for example, we cannot assign a string to InOutArgument , while it is allowed to assign a string to InArgument directly in the host program.

This type of argument is used to receive values and is also used to pass values out to the caller WF host. Author a workflow :.

Author a WF program as shown in the following screenshot. The application should run in a console window and print the message as shown in the following screenshot:. The string Now, I am InMessage is printed by the workflow. The string Now, I am an OutMessage is a message altered in the workflow and passed to the host and then printed by the host program. We cannot assign a string to InOutArgument directly, and the following style of parameter initialization is not allowed:.

We can use Variable temporarily to store a value when a WF program is running. In this task, we will create a WF program that prints five numbers to the console in a loop. We will use the NumberCounter variable as a number counter.

Then, author the workflow as shown in the following screenshot. Set UseVariable as Startup project. To make the workflow logic easy to understand, translate the workflow into C code. It will look like:. While we can use arguments to flow data into and out of a workflow, we use Variable to store data in a workflow. Every variable has its scope, and can be accessed by activities within its scope. Variable in WF4 is pretty much like variables in imperative language such as C.

Please note that we cannot access to the workflow variables from the outside host. WF4 variables are designed for sharing data inside the workflow instance.

We can use Bookmark to access the workflow from the outside host. In the previous tasks, we used the WorkflowInvoker. Invoke method to start a workflow instance on the same thread as the main program.

 
 

 

About this ebook.Microsoft windows workflow foundation 4.0 cookbook pdf download

 
WebNo deadline once you receive your Ebook downloadable PDF through your email, you can keep it forever and there is no deadline for using it; Interactive Features Easily highlight . WebIt is a fast moving and to-the-point guide, it takes you thru the $ elements it’s good to recognize whilst operating with home windows WF. the diversity of subject matters that . WebOct 02,  · Downloads. Visual Studio; SDKs; Trial software. Free downloads; Office resources; Programs. Subscriptions. Overview; Administrators; Students. Microsoft .

A dialog will show up asking for type; choose Product type for it. See the following screenshot: 66 Chapter 2 5. A console application will show the result: How it works Traditionally, in C , a switch statement can operate only on primitive types such as Boolean, Int32, String, and enumeration types.

In WF4, a Switch activity can operate on a userdefined type at runtime. To enable this interesting feature, we must perform the following steps: 1. Create a type converter class to convert an object of user-defined type to a string and a string to object. Override the following two methods of user-defined classes: public override bool Equals object obj and public override int GetHashCode. We can then see the Product class for the implementation sample.

Using the FlowSwitch activity In the flowchart, we should use the FlowSwitch Activity instead of the Switch activity, which we used in the previous task. In this task, we will create a flowchart workflow using the FlowSwitch activity. This switch activity will operate on a string.

Author a workflow: Open Workflow1. Please note that when we drag the Flowswitch activity to the flowchart, we will be shown a dialog to choose the type. In this task, we have chosen String. Because the Flowswitch activity will not only operate on strings but also other types. A console application will show the result. How it works Like the switch key word in C , the FlowSwitch activity is a Flowchart condition node that handles multiple selections by passing control to one of the branch activities.

Please note that if the flow branching requires only two paths, we should use the FlowDescision activity instead. See Also A number guessing game in a flowchart. Using the Parallel activity In this task, we will create a sample that will use the Parallel activity. The Parallel activity can execute its child activities in parallel, asynchronously. Create a workflow: Open Workflow1. Workflow execution starts from Sequence1, then there is a delay of 5 seconds and the execution of Parallel will shift to the Sequence2 branch immediately.

Now Sequence2 will delay for 5 seconds and the execution shift to the Sequence1 branch again, and now, both Sequence1 and Sequence2 are in a delaying state. The whole Parallel activity will wait there until one of them awakes. The embedded parallel branches are scheduled and run asynchronously, but they do not run on separate threads.

So, each successive branch will execute only when the previous branch completes or goes idle. ParallelForEach itself is akin to a Parallel activity for its child activities. Let’s create a sample to see how it works. We can refer the following screenshot: How it works We should find that the Delay activity in Seqence2 branch seems not to take effect at all. In fact, whenever the ParallelForEach’s embedded statement goes idle, the next statement will be executed immediately rather than waiting there, that is why we call it the ParallelForEach activity.

This activity will execute one of its parallel subactivities, and only one of its activities will be executed before the Pick activity completes.

Typically, we use Pick to set up a time-out for an activity. Create a workflow: Create a workflow as shown in the following screenshot: We are not allowed to define variables in the Pick activity scope. Create a workflow host: Open the Program. Set ; wfApp. Run ; waitHandler. In this workflow, there are two branches in the Pick activity.

Each branch has a Delay activity— Branch1 is delayed by 3 seconds, whereas Branch2 is delayed by 5 seconds. At execution time, both branches are executed in parallel. When Branch1 completes, Branch2 is cancelled. There’s more If we are already familiar with customized activities and bookmark, we can replace one of the Delay activity with a bookmark activity. To create a bookmark: 1. Add a new code file to the project and name the file as MyBookmark. Fill the file with the following code: using System.

CreateBookmark BookmarkName. Open Workflow1. Click the left Trigger Branch1 and create an inputString Variable. Create an InArgument named BookmarkName. We now need to replace the left Delay activity with our bookmark activity: MyBookmark. Change the host code in the program.

Run ; wfApp. ReadLine ; waitHandler. WaitOne ; 4. In the opening console application, we can either input a string or wait for 5 seconds, and the workflow will time out and terminate. Handling errors In this task, we are going to create a Sequence workflow with a TryCatch activity. There will be a dividend assigned with zero, and hence we can generate a divide-by-zero exception deliberately so that we can handle this error in a TryCatch activity.

Create a code workflow: Create a new class file and name it ErrorHandlingWorkflow. Fill the file with the following code: using System; using System. Create host code: Open Program. Invoke errorHandlingWorkflow. We will be able to see a console application like this: How it works They both have “try”, “catch”, and “finally”, and they even share similar structure.

Net Remoting, Web Service, and so on. Starting from. NET Framework 3. By using WCF, messaging has become an easy and flexible task. WF4 takes advantage of WCF and provides some out of the box messaging activities. In this chapter, we will focus on the built-in messaging activities shipped by WF4. Messaging and Transaction In the case of service host, though we can use the Local Web Development Server shipped with.

NET Framework4. Please remember its folder path. We will create files in this folder in the following steps. Please also note that the WCFSite should run in. Next, create a StockService. Fill the StockService. Create an svc file: In the application folder, create a new file named StockService. Create a config file: In the application folder, create the configuration file by the name of Web. Test it: If we have finished the above steps, in the IIS content panel we shall see the following: 84 Chapter 3 We can test it in two ways.

Using an internet browser: Right-click the StockService. IIS will open the service in IE by default. If we have our Visual Studio installed in another path, we can type wcftestclient in the Run command box to search for the tool. Add the StockPriceService to the tool, double-click the GetPrice method, and then click the Invoke button to get the result. Because of B, the service client knows how to use the service.

There are many binding types such as basicHttpBinding, wsHttpBinding, and so on. Different services use different binding types. In this task, we use wsHttpBinding. This is defined in the web. Because of C, the service client knows what content the service provides.

When the request comes, IIS will capture the request. IIS finds that the request is postfixed with svc. The following are the httphandler mappings: 86 Chapter 3 According to the httphandler mappings, IIS will use the appropriate handler to handle the WCF request.

That is why the first request will take a little bit longer to get the response. There’s more WCF Windows Communication Foundation is Microsoft’s next-generation unified network programming model for building service-oriented applications. WCF enables us to build secure, reliable, and distributed solutions with ease. We can work through the following tasks based on the understanding from this task.

Of course we will understand the following tasks better if we are already equipped with enough WCF knowledge. This workflow will accept two integer numbers and return their sum to the caller. Create a workflow: Open the default created Service1. We need to perform the following actions: i. Click the View parameter… link of the ReceiveRequest activity and add two Int32 type service parameters xIn and yIn as shown in the following screenshot: iii.

Right-click the ReceiveRequest activity and select Properties; the properties should be set as shown in the screenshot: 88 Chapter 3 iv. Click the View parameter… link of the SendResponse activity and add an Int32 type service parameter named addResult; refer to the following screenshot: Now, we can save and close the workflow. The final workflow should be like this: 3.

Right-click Service1. If you have your Visual Studio installed in your own folder, you can type wcftestclient in the Run command box to search the tool. Double-click the GetData method, input two numbers for xIn and yIn respectively, and then click the Invoke button.

If we can get the addition result, we have successfully created the workflow service. Chapter 3 ii. Set the application’s Physical path to the project folder path: How it works There are two items we need to pay close attention to.

We can also add or remove features by editing the Web. If we want to know how to create and host the workflow service with imperative code, we may refer to the next task. This workflow will accept two integer numbers and return the addition sum to the caller. This workflow is hosted in a console application rather than IIS. Create the workflow in code: Add a new class file to the project and name it ReceiveAndReplyWorkflow. ServiceModel; using System.

Get aec. Add configuration code: Open the App. Create workflow service host code: Set up the workflow host in the Program. Linq; using System.

WriteLine “Opening Service Open ; Console. ToString ; Console. Double-click GetData , input two numbers , click the Invoke button, and we will get the result.

If we want to create workflow in imperative code, we have to take care of too many things; those are hidden in visual workflow. On the other hand, creating code workflow will help us understand workflow better. After all, all visual workflow declared as XAML will be compiled to. NET assembly before execution. By using WorkflowService class, we can configure and access the properties of a workflow service. When we set CanCreateInstance property to true, every WCF request will create a new workflow instance to handle each request.

Getting ready For this task, we need to choose one of the previous tasks that we performed as the WF service—Receiving and replying a WCF message or Receiving and replying to a WCF message in code workflow.

Find out service information: Before moving to authoring a workflow service client, we need to find out some basic WCF service information—as we stated in the first task of this chapter, the famous ABC of WCF services.

Double-click GetData , input two numbers, click the Invoke button, and we should get the service result. Drag a SendAndReceiveReply activity to the designer panel. Right-click the Send activity and select Properties. Specify four properties of the Send activity. We obtained this information in step 2. Make sure not to use double quotation marks ” ” around the AddressUri property. Just leave it there. Click the Define… link of the Send activity and input the operation parameters’ names, which we obtained in step 2.

Click the Define… link of the ReceiveReplyForSend activity and input the response parameter we obtained in step 2. ToString in the text expression box. Now the workflow should look like the following screenshot: Messaging and Transaction 4. We will see the following: How it works The Send activity enables us to start a conversation with the WCF service.

In the behind stage, the Send activity will fetch the wsdl file according to the endpoint address, and then generate a proxy that can be used to call the WCF service. So, the Send activity gets many tedious things done and we can use the activity by just performing some configurations.

We can use a Send activity alone to send a message without expecting a response, or we can use a Send activity paired with a Receive activity to send a message and wait till a response is received from the service. In this task, we use the second pattern by dragging the built-in SendAndReceiveReply pattern to the designer panel.

There’s more We can also add the WF service to the project service reference and use the service like a local activity. We can accomplish it by following the next steps: 1.

Add a WF service to the project’s service reference. Build the project. Now we can see the WF service operation appearing in the toolbox. Use the GetData activity just like a local activity. Edit the properties of the GetData activity: Messaging and Transaction 6. Save the workflow and build the project. It is easy to consume a WF service like this; however, there are two drawbacks as follows: ff Visual Studio is needed, which is not available in the customized WF designer by default.

While many workflows exist in XAML files and may even be stored in a database, adding references is not an option for standalone workflows. Getting ready Now that we have finished at least one of the previous tasks—Receiving and replying to a WCF message or Receiving and replying to a WCF message in code workflow—we can choose one of them as the WF service in this task. In this task I will use the code-style WF service. Create workflow host code: Open the Program.

Invoke srw. Run it: Follow the steps given next: i. In this task, there are three important activities we need to focus on. Please note that the Send activity will generate a WCF contract dynamically when it is running. By using these properties, the Send activity is able to establish a “connection” not always connected with WF service. Every ReceiveReply activity will receive messages initiated by a Send activity in the same correlation scope.

Using CancellationScope activity As we know, the Parallel activity will not finish execution until all of its child branches have finished execution. Sometimes, we want to break the parallel if one of its branch finishes execution and cancel the other branches.

To do this, we can use a CancellationScope activity. In this task, we want to order products from two dealers Dealer A and Dealer B at the same time. In this situation, the two dealers are in a competition, and so the one who ships the product faster wins the business. Create a code workflow file: Add to the project a new class file and name it WorkflowWithCancellationScope.

Invoke wcs. Because dealer A uses 6 seconds to ship the product to us, whereas dealer B uses only 5 seconds, we will see the following result: How it works This workflow is simply a Parallel activity with two CancellationScope activities.

By default, a Parallel activity will finish executing once all of its child branches have finished executing. While in this task, we set CompletionCondition to true so that the Parallel will finish if one of its branch runs to its end. Drag a Parallel activity to the workflow designer panel. Right-click the activity and select Properties. Set the ConpletionCondition property to True: 2. Drag two CancellationScope activities into the Parallel activity.

Drag two Sequence activities to the bodies of the two CancellationScope activities respectively. Drag two Delay activities to the two Sequence activities respectively. Set the left Delay activity’s delay time to 6 seconds and set the right Delay activity’s delay time to 5 seconds.

Add two WriteLine activities below the Delay activities respectively. Input string “DealerA: Your product has been shipped. Add two WriteLine activities to the two CancelationHandler activities.

Input string “DealerA, cancel my order” to the left WriteLine activity and input string “DealerB, cancel my order” to the right Writeline activity. Add references to the project: Add a reference to the System.

Tranactions namespace because we are going to use IsolationLevel enumeration in our code. By using this activity, we can insert a row of data into the database that has been created in advance. Fill the file with the following code. Replace the SQL Server connection string with our own one. SqlConnection ; con. CreateCommand ; cmd.

Get context ; cmd. ExecuteNonQuery ; con. Create workflow code: Add a new class file in the project and name it TransactionWorkflow. The class will define the workflow structure. GetInstance ; wfApp. WriteLine arg. Message ; return UnhandledExceptionAction. By default, we will see the following: If we open the database table, we will find no data has been inserted into the table.

Next, we have to change the workflow definition TransactionWorkflow. Let’s start from the Program. WriteLine “Attempted to divide by zero exception, database rolled back. In our workflow, the divided-by-zero exception will be handled here.

Once an exception occurs, workflow will be terminated and the database rolled back. Be aware of the fact that the table will be locked during the transaction processing. Serializable By doing this, the database will place locks on all data that is used in a transaction, and will prevent other users from updating and making non-repeatable reads. Then we need to create a workflow as shown in the following screenshot: Chapter 3 Please note that if we cannot find the InsertDataToDBActivity activity, we need to rebuild the project by pressing F6.

Performing compensation by using Compensable activity Imagine a scenario where we are buying a computer online and money has been deducted from our bank account.

Suddenly an unexpected exception occurs, workflow stops, and the purchase gets cancelled. Obviously, such a thing should not happen in real life. If an exception occurs that induces workflow stop, the money should be returned back to our account. In WF4 we can use a Compensable activity to handle such a compensation job.

Create workflow code: Add a new class file to the project and name it CompensationWokflow. We should see this: How it works As soon as the workflow starts, the Writeline activity in the body of CompensableActivity performs its action and prints its message to the control. Next, the Assign activity will generate a divided-by-zero exception due to the setting of 0 as the value of the Variable num2.

Create workflow code: Add a new class file to the project and name it CompensationWorkflow. Create host code: Open the Program.

Invoke cw. How could a compensate activity know which CompensableActivity it is going to compensate? We use CompensationToken to link them together. Performing confirmation by using Confirm activity Like performing compensation, we can also perform confirmation by explicitly using a Confirm activity.

Confirmation will also be triggered when workflow is successfully finished. Create workflow code: Add a new class file to the project and name it ConfirmationWorkflow. Then fill the file with the following code: using System; using System. If we have a careful look at the result, we shall see that compensableActivity1 and compensableActivity2 execute one after the other, and then the confirm activity executes as the confirm activity is linked to CompensableActivity2 by token.

The ConfirmationHandler executes and prints a line of message to the console. When the workflow finishes successfully, the ConfirmationHandler of CompensableActivity1 will take action automatically and print a line of message to the console. Printing collection items In this task, we will customize an activity that can print all collection items to Console Application. Manipulating Collections How to do it 1.

Refer to the following screenshot: Open the CollectionPrinter. Generic; using System. Get context ; if collection. WriteLine item. WriteLine “Collection is empty. Build the project: Build the project so that the custom activity will appear in the toolbox. Create a visual workflow: To create visual workflow, we need to perform the following actions: i. Open the default created workflow file Workflow1. Drag a Sequence activity to the design panel.

Drag a CollectionPrinterActivity activity onto the Sequence activity. A dialog box will appear asking us to choose type; here we choose String. Click the Imports button and type in System. ObjectModel to imported the namespace System. ObjectModel to this workflow. The following is the final workflow: 5. In this task, we created an activity that can accept generic type Collection object.

We will use this activity throughout this chapter. We need to make sure we have finished this task before moving ahead. There’s more We can also use CollectionPrinterActivity in code-style workflow. To create a corresponding workflow in code, open the Program. Invoke new Workflow1 ; WorkflowInvoker. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinterActivity activity in this task.

Create a visual workflow: We need to perform the following actions: i. Open the Workflow1. ObjectModel to import the System. ObjectModel namespace to this workflow. Drag a Sequence activity to the workflow designer and then drag an AddToCollection activity onto the Sequence activity. Add a new ICollection variable named people to the Sequence’s scope. We can see the workflow shown in the following screenshot: Chapter 4 iii. Set the properties of the AddToCollection activity as shown in the following screenshot: iv.

Set the properties of the CollectionPrinter activity: Manipulating Collections 3. We will see: How it works The AddToCollection activity will append the new item to the end of the collection object. If we want to insert an item to a specified position, we may need to create our own activity to do this. There’s more We can also use the AddToCollection activity in code-style workflow. To use AddToCollection in code workflow, open the Program.

Invoke new Workflow1 ; Using ClearCollection activity In this task, we will use the ClearCollection activity to clear the content of a collection object. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinter activity in this task. Create a visual workflow: Perform the following steps in order to create a visual workflow: i.

Drag a Sequence activity to the workflow designer and then drag a CollectionPrinter activity to the designer panel two times to add two CollectionPrinter activities to the designer panel. Next, drag a ClearCollection activity between the two CollectionPinter activities—the type is String. We can see the workflow as shown in the following screenshot: iii. Set the properties of both the CollectionPrinter activities: Chapter 4 iv.

Set the properties for the ClearCollection activity: 3. By using this activity, we can remove all collection items, so that we can reuse the collection variable again rather than defining a new one. Open the program. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinterActivity in this task. Create a workflow: We need to perform the following tasks to create a workflow: i.

Drag a Sequence activity to the workflow designer panel. Next, drag CollectionPrinter activity to the designer panel two times. Set the properties of both the CollectionPrinter activities: iv. Set the properties of the RemoveFromCollection activity: Chapter 4 3. The Result property of RemoveFromCollection activity indicates whether or not an item is deleted successfully.

If the item exists and is deleted by this activity, then the Result property will be assigned a True value. Generic; System. Invoke new Workflow1 ; Chapter 4 Using ExistsInCollection activity In this task, we will use the ExistsInCollection activity to check whether or not a specified item exists in the collection object.

Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use CollectionPrinterActivity in this task.

Create a workflow: We need to perform the following actions to create a workflow: i. Drag a Sequence activity into the designer panel. Now drag a WriteLine activity below the ExistsCollection activity. Add a Boolean type variable result to the Sequence’s scope.

Set the propertes of the CollectionPrinter activity: iv. Set the properties of the ExistsInCollection activity: Chapter 4 v. Set the Text property of the WriteLine activity as follows. ToString 3. It is a simple activity by which we can test whether or not a specified item exists in a particular collection object.

Please note that we have to set the correct TypeArgument for this activity. WF4 provides some build-in activities that can be used directly in the workflow designer panel. But many times, we need to create our own activities—for example, an activity that can send e-mail to inform someone about finishing a task or any other important thing. To define our own activity, we should write a class that implements the root abstract Activity or one of its predefined subclasses.

Custom Activities The following is the activity modeling class hierarchy diagram: This chapter intends to provide readers not only with some additional activities besides the built-in activities, but also with some concepts on how to build our own activities.

Before moving ahead, please create two projects. The first is the ActivityLibrary project named ActivityLibrary. Delete Workflow1. We will use these two projects throughout this chapter. The ActivityLibrary project is for all customized activities, whereas the WorkflowConsoleApp project is used for testing our customized activities. The following screenshot shows the project structure: Creating an activity by inheriting the root activity The abstract Activity class is the root of all subactivity classes.

In this task, we will create a custom activity inheriting directly from Activity. Customize an Activity: Add a new code file MyActivity. Add a reference to ActivityLibrary: In the WorkflowConsoleApp project, add an assembly reference to ActivityLibrary for us to be able to use these customized activities in the WorkflowConsoleApp project. Please note that when we add a new workflow to the project, we actually select Activity in the Add New Item dialog. Drag a Sequence activity to the designer panel.

Drag a WriteLine activity into the Sequence activity and input Workflow start… in the textbox. Drag MyActivity below the WriteLine activity. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact alibabacloud.

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If you find any instances of plagiarism from the community, please send an email to: info-contact alibabacloud. Alibaba Cloud offers highly flexible support services tailored to meet your exact needs. A comprehensive suite of global cloud computing services to power your business. International – English International English. Log In Sign Up. Account Creation: The system will allow clients to create accounts either by coming into a branch where an employee can create the account via a thick client application or by allowing the client to create the account via a website.

Income Tax Information Submission: The system will allow clients to submit income tax-related information for review by an accountant either in a branch office or on the Web. Management of Assigning of Clients to Accountants: The system will allow for the automated assigning of clients to accountants with support for manual updating of assignments.

Managing the Approval Process: The system will allow for managing the review and approval process involved in preparing income tax papers for submission to the IRS, including management of requesting more information from clients, following up with clients, and routing information received from clients to correct accounts.

Notifications: The system will allow for notifying clients of various account and tax submission-related events.

How would a system like this be built without using a workflow framework? Our first attempt might be to create a set of web services that support:. Approving the information submitted to indicate that the income tax information is complete and ready for an accountant to make an income tax return to be submitted to the IRS.

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Explore Documents. Enjoy millions of ebooks, audiobooks, magazines, and more, with a free trial. Ebook pages 2 hours. Start your free days. Read preview. About this ebook This is a fast-paced and to-the-point handbook, it takes you through the important aspects that you need to know when working with Windows WF. The range of topics that we cover in this book is driven by what the working developer needs to know. It is neither a comprehensive reference to the whole WF architecture, nor a strategic guide to the complete application development lifecycle.

If you find yourself working with Windows Workflow Foundation 4. With this book, you will be able to enhance your applications with flexible workflow capabilities using WF 4. To follow the recipes, you will need to be comfortable with.

Language English. Publisher Packt Publishing. Release date Sep 24, ISBN Related to Microsoft Windows Workflow Foundation 4.

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WebIt is a fast moving and to-the-point guide, it takes you thru the real elements you should be aware of while operating with home windows WF. the diversity of subject matters that . WebWindows Workflow Foundation (WF) is a significant part replace.me Framework WF makes workflow technology available to every single programmer that uses replace.me . WebNo deadline once you receive your Ebook downloadable PDF through your email, you can keep it forever and there is no deadline for using it; Interactive Features Easily highlight .
WebOct 02,  · @Andrew Zhu, Can you let me know, when the book will be published. I pre-ordered the ebook, but not sure when that will be out. · Hi, Packt told me that they will. WebIt is a fast moving and to-the-point guide, it takes you thru the real elements you should be aware of while operating with home windows WF. the diversity of subject matters that . WebThis book provides both step-by-step recipes and relevant background information. it covers all the important aspects of Windows Workflow Foundation the best thing about . WebOct 02,  · Downloads. Visual Studio; SDKs; Trial software. Free downloads; Office resources; Programs. Subscriptions. Overview; Administrators; Students. Microsoft .

NET applications. Before moving ahead, make sure we have the following installed on our computer:. In this task we will create our first workflow to print “Hello Workflow” to the console application.

A dialog is presented, as shown in the following screenshot. Name the project HelloWorkflow. Name the solution Chapter01 and make sure to create a directory for the solution. Author the workflow program :. First, drag a Sequence activity to the designer from Toolbox , next drag a WriteLine activity into the Sequence activity.

Finally, input “Hello Workflow” in the expression box of the WriteLine activity. We can see in the following screenshot:. The result is as shown in the following screenshot:. The preceding statement starts the workflow.

We can open Workflow1. Right-click on Workflow1. All XAML files will be compiled to. We need a copy of Visual Studio installed on our computer to use WF4 Designer, otherwise we can only create workflows by imperative code or by writing pure XAML files. In this task, we will create the same “HelloWorkflow” function workflow using pure C code, beginning from a Console Application.

Create a new Console Application project under the Chapter01 solution. Name the project HelloCodeWorkflow. The following screenshot shows the Console Application new project dialog:. Add reference to the System. Activities assembly :. By default, a new Console Application doesn’t have reference to the System. Activities assembly, due to which we need to perform this step. Create workflow definition code :. As expected, the result should be just like the previous result shown.

Because WorflowInvoker class belongs to System. Activities namespace. Sequence activity, WriteLine activity belongs to System. This code statement loads a workflow instance up and runs it automatically. The WorkflowInvoker. Invoke method is synchronous and invokes the workflow on the same thread as the caller.

WF4 also provides us a class DynamicActivity by which we can create a workflow instance dynamically in the runtime. In other words, by using DynamicActivity , there is no need to define a workflow class before initializing a workflow instance.

Here is some sample code:. In this task, we will create a WF program that accepts arguments when initialized in the WF host. In WF4, we can use InArguments to define the way data flows into an activity. Create a new Workflow Console Application under the Chapter01 solution. Name the project UseInArgument. Author the WF program :.

Write code to host the workflow. The application should run in a console window and print the following message:. FirstName is an InArgument type , but how can we assign a string to InArgument without any explicit cast? This is because InArgument is declared with an attribute System. TypeConverterAttribute System. The class inheritance is shown in the following diagram:.

This also applies to WF4. If we are creating workflows using imperative code, we can use InArgument in the following way:. Create a workflow project :. Drag a Sequence activity from Toolbox to the designer panel. In the bottom of the designer panel, click the Arguments button, and click Create Argument to create an OutArgument string named OutMessage. Drag two WriteLine activities from Toolbox into the Sequence activity and fill the textboxes with “Start…” and “End” respectively.

Drag an Assign activity from Toolbox to the designer panel. Fill the right expression box with OutArgument as OutMessage , whereas fill the right expression box with the following string: This is a message from workflow. Set UseOutArgument as Startup project. The application should run in a console window and print the message as shown in the next screenshot:.

OutMessage is the name of OutArgument we defined in Workflow1. Invoke method will return a IDictionary type object. We can also add or remove features by editing the Web.

If we want to know how to create and host the workflow service with imperative code, we may refer to the next task. This workflow will accept two integer numbers and return the addition sum to the caller. This workflow is hosted in a console application rather than IIS. Create the workflow in code: Add a new class file to the project and name it ReceiveAndReplyWorkflow. ServiceModel; using System. Get aec. Add configuration code: Open the App.

Create workflow service host code: Set up the workflow host in the Program. Linq; using System. WriteLine “Opening Service Open ; Console. ToString ; Console. Double-click GetData , input two numbers , click the Invoke button, and we will get the result. If we want to create workflow in imperative code, we have to take care of too many things; those are hidden in visual workflow. On the other hand, creating code workflow will help us understand workflow better. After all, all visual workflow declared as XAML will be compiled to.

NET assembly before execution. By using WorkflowService class, we can configure and access the properties of a workflow service.

When we set CanCreateInstance property to true, every WCF request will create a new workflow instance to handle each request. Getting ready For this task, we need to choose one of the previous tasks that we performed as the WF service—Receiving and replying a WCF message or Receiving and replying to a WCF message in code workflow.

Find out service information: Before moving to authoring a workflow service client, we need to find out some basic WCF service information—as we stated in the first task of this chapter, the famous ABC of WCF services. Double-click GetData , input two numbers, click the Invoke button, and we should get the service result. Drag a SendAndReceiveReply activity to the designer panel.

Right-click the Send activity and select Properties. Specify four properties of the Send activity. We obtained this information in step 2. Make sure not to use double quotation marks ” ” around the AddressUri property. Just leave it there. Click the Define… link of the Send activity and input the operation parameters’ names, which we obtained in step 2.

Click the Define… link of the ReceiveReplyForSend activity and input the response parameter we obtained in step 2. ToString in the text expression box. Now the workflow should look like the following screenshot: Messaging and Transaction 4. We will see the following: How it works The Send activity enables us to start a conversation with the WCF service. In the behind stage, the Send activity will fetch the wsdl file according to the endpoint address, and then generate a proxy that can be used to call the WCF service.

So, the Send activity gets many tedious things done and we can use the activity by just performing some configurations. We can use a Send activity alone to send a message without expecting a response, or we can use a Send activity paired with a Receive activity to send a message and wait till a response is received from the service. In this task, we use the second pattern by dragging the built-in SendAndReceiveReply pattern to the designer panel.

There’s more We can also add the WF service to the project service reference and use the service like a local activity. We can accomplish it by following the next steps: 1. Add a WF service to the project’s service reference. Build the project. Now we can see the WF service operation appearing in the toolbox. Use the GetData activity just like a local activity.

Edit the properties of the GetData activity: Messaging and Transaction 6. Save the workflow and build the project. It is easy to consume a WF service like this; however, there are two drawbacks as follows: ff Visual Studio is needed, which is not available in the customized WF designer by default. While many workflows exist in XAML files and may even be stored in a database, adding references is not an option for standalone workflows.

Getting ready Now that we have finished at least one of the previous tasks—Receiving and replying to a WCF message or Receiving and replying to a WCF message in code workflow—we can choose one of them as the WF service in this task. In this task I will use the code-style WF service. Create workflow host code: Open the Program.

Invoke srw. Run it: Follow the steps given next: i. In this task, there are three important activities we need to focus on. Please note that the Send activity will generate a WCF contract dynamically when it is running.

By using these properties, the Send activity is able to establish a “connection” not always connected with WF service. Every ReceiveReply activity will receive messages initiated by a Send activity in the same correlation scope.

Using CancellationScope activity As we know, the Parallel activity will not finish execution until all of its child branches have finished execution. Sometimes, we want to break the parallel if one of its branch finishes execution and cancel the other branches. To do this, we can use a CancellationScope activity. In this task, we want to order products from two dealers Dealer A and Dealer B at the same time. In this situation, the two dealers are in a competition, and so the one who ships the product faster wins the business.

Create a code workflow file: Add to the project a new class file and name it WorkflowWithCancellationScope. Invoke wcs. Because dealer A uses 6 seconds to ship the product to us, whereas dealer B uses only 5 seconds, we will see the following result: How it works This workflow is simply a Parallel activity with two CancellationScope activities.

By default, a Parallel activity will finish executing once all of its child branches have finished executing. While in this task, we set CompletionCondition to true so that the Parallel will finish if one of its branch runs to its end. Drag a Parallel activity to the workflow designer panel. Right-click the activity and select Properties. Set the ConpletionCondition property to True: 2.

Drag two CancellationScope activities into the Parallel activity. Drag two Sequence activities to the bodies of the two CancellationScope activities respectively. Drag two Delay activities to the two Sequence activities respectively. Set the left Delay activity’s delay time to 6 seconds and set the right Delay activity’s delay time to 5 seconds. Add two WriteLine activities below the Delay activities respectively. Input string “DealerA: Your product has been shipped. Add two WriteLine activities to the two CancelationHandler activities.

Input string “DealerA, cancel my order” to the left WriteLine activity and input string “DealerB, cancel my order” to the right Writeline activity. Add references to the project: Add a reference to the System.

Tranactions namespace because we are going to use IsolationLevel enumeration in our code. By using this activity, we can insert a row of data into the database that has been created in advance. Fill the file with the following code. Replace the SQL Server connection string with our own one. SqlConnection ; con. CreateCommand ; cmd. Get context ; cmd. ExecuteNonQuery ; con. Create workflow code: Add a new class file in the project and name it TransactionWorkflow.

The class will define the workflow structure. GetInstance ; wfApp. WriteLine arg. Message ; return UnhandledExceptionAction. By default, we will see the following: If we open the database table, we will find no data has been inserted into the table. Next, we have to change the workflow definition TransactionWorkflow. Let’s start from the Program. WriteLine “Attempted to divide by zero exception, database rolled back. In our workflow, the divided-by-zero exception will be handled here.

Once an exception occurs, workflow will be terminated and the database rolled back. Be aware of the fact that the table will be locked during the transaction processing. Serializable By doing this, the database will place locks on all data that is used in a transaction, and will prevent other users from updating and making non-repeatable reads.

Then we need to create a workflow as shown in the following screenshot: Chapter 3 Please note that if we cannot find the InsertDataToDBActivity activity, we need to rebuild the project by pressing F6.

Performing compensation by using Compensable activity Imagine a scenario where we are buying a computer online and money has been deducted from our bank account. Suddenly an unexpected exception occurs, workflow stops, and the purchase gets cancelled. Obviously, such a thing should not happen in real life. If an exception occurs that induces workflow stop, the money should be returned back to our account.

In WF4 we can use a Compensable activity to handle such a compensation job. Create workflow code: Add a new class file to the project and name it CompensationWokflow. We should see this: How it works As soon as the workflow starts, the Writeline activity in the body of CompensableActivity performs its action and prints its message to the control. Next, the Assign activity will generate a divided-by-zero exception due to the setting of 0 as the value of the Variable num2.

Create workflow code: Add a new class file to the project and name it CompensationWorkflow. Create host code: Open the Program. Invoke cw. How could a compensate activity know which CompensableActivity it is going to compensate? We use CompensationToken to link them together. Performing confirmation by using Confirm activity Like performing compensation, we can also perform confirmation by explicitly using a Confirm activity.

Confirmation will also be triggered when workflow is successfully finished. Create workflow code: Add a new class file to the project and name it ConfirmationWorkflow. Then fill the file with the following code: using System; using System. If we have a careful look at the result, we shall see that compensableActivity1 and compensableActivity2 execute one after the other, and then the confirm activity executes as the confirm activity is linked to CompensableActivity2 by token.

The ConfirmationHandler executes and prints a line of message to the console. When the workflow finishes successfully, the ConfirmationHandler of CompensableActivity1 will take action automatically and print a line of message to the console. Printing collection items In this task, we will customize an activity that can print all collection items to Console Application.

Manipulating Collections How to do it 1. Refer to the following screenshot: Open the CollectionPrinter. Generic; using System. Get context ; if collection.

WriteLine item. WriteLine “Collection is empty. Build the project: Build the project so that the custom activity will appear in the toolbox. Create a visual workflow: To create visual workflow, we need to perform the following actions: i. Open the default created workflow file Workflow1. Drag a Sequence activity to the design panel. Drag a CollectionPrinterActivity activity onto the Sequence activity.

A dialog box will appear asking us to choose type; here we choose String. Click the Imports button and type in System. ObjectModel to imported the namespace System. ObjectModel to this workflow. The following is the final workflow: 5. In this task, we created an activity that can accept generic type Collection object. We will use this activity throughout this chapter.

We need to make sure we have finished this task before moving ahead. There’s more We can also use CollectionPrinterActivity in code-style workflow. To create a corresponding workflow in code, open the Program. Invoke new Workflow1 ; WorkflowInvoker. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinterActivity activity in this task.

Create a visual workflow: We need to perform the following actions: i. Open the Workflow1. ObjectModel to import the System. ObjectModel namespace to this workflow. Drag a Sequence activity to the workflow designer and then drag an AddToCollection activity onto the Sequence activity.

Add a new ICollection variable named people to the Sequence’s scope. We can see the workflow shown in the following screenshot: Chapter 4 iii. Set the properties of the AddToCollection activity as shown in the following screenshot: iv. Set the properties of the CollectionPrinter activity: Manipulating Collections 3. We will see: How it works The AddToCollection activity will append the new item to the end of the collection object.

If we want to insert an item to a specified position, we may need to create our own activity to do this. There’s more We can also use the AddToCollection activity in code-style workflow. To use AddToCollection in code workflow, open the Program. Invoke new Workflow1 ; Using ClearCollection activity In this task, we will use the ClearCollection activity to clear the content of a collection object.

Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinter activity in this task. Create a visual workflow: Perform the following steps in order to create a visual workflow: i. Drag a Sequence activity to the workflow designer and then drag a CollectionPrinter activity to the designer panel two times to add two CollectionPrinter activities to the designer panel. Next, drag a ClearCollection activity between the two CollectionPinter activities—the type is String.

We can see the workflow as shown in the following screenshot: iii. Set the properties of both the CollectionPrinter activities: Chapter 4 iv. Set the properties for the ClearCollection activity: 3.

By using this activity, we can remove all collection items, so that we can reuse the collection variable again rather than defining a new one.

Open the program. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinterActivity in this task. Create a workflow: We need to perform the following tasks to create a workflow: i.

Drag a Sequence activity to the workflow designer panel. Next, drag CollectionPrinter activity to the designer panel two times. Set the properties of both the CollectionPrinter activities: iv. Set the properties of the RemoveFromCollection activity: Chapter 4 3. The Result property of RemoveFromCollection activity indicates whether or not an item is deleted successfully.

If the item exists and is deleted by this activity, then the Result property will be assigned a True value.

Generic; System. Invoke new Workflow1 ; Chapter 4 Using ExistsInCollection activity In this task, we will use the ExistsInCollection activity to check whether or not a specified item exists in the collection object. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use CollectionPrinterActivity in this task.

Create a workflow: We need to perform the following actions to create a workflow: i. Drag a Sequence activity into the designer panel. Now drag a WriteLine activity below the ExistsCollection activity. Add a Boolean type variable result to the Sequence’s scope. Set the propertes of the CollectionPrinter activity: iv. Set the properties of the ExistsInCollection activity: Chapter 4 v. Set the Text property of the WriteLine activity as follows. ToString 3. It is a simple activity by which we can test whether or not a specified item exists in a particular collection object.

Please note that we have to set the correct TypeArgument for this activity. WF4 provides some build-in activities that can be used directly in the workflow designer panel. But many times, we need to create our own activities—for example, an activity that can send e-mail to inform someone about finishing a task or any other important thing. To define our own activity, we should write a class that implements the root abstract Activity or one of its predefined subclasses.

Custom Activities The following is the activity modeling class hierarchy diagram: This chapter intends to provide readers not only with some additional activities besides the built-in activities, but also with some concepts on how to build our own activities.

Before moving ahead, please create two projects. The first is the ActivityLibrary project named ActivityLibrary. Delete Workflow1. We will use these two projects throughout this chapter. The ActivityLibrary project is for all customized activities, whereas the WorkflowConsoleApp project is used for testing our customized activities. The following screenshot shows the project structure: Creating an activity by inheriting the root activity The abstract Activity class is the root of all subactivity classes.

In this task, we will create a custom activity inheriting directly from Activity. Customize an Activity: Add a new code file MyActivity. Add a reference to ActivityLibrary: In the WorkflowConsoleApp project, add an assembly reference to ActivityLibrary for us to be able to use these customized activities in the WorkflowConsoleApp project. Please note that when we add a new workflow to the project, we actually select Activity in the Add New Item dialog. Drag a Sequence activity to the designer panel.

Drag a WriteLine activity into the Sequence activity and input Workflow start… in the textbox. Drag MyActivity below the WriteLine activity. Check the Program.

We should see the following: How it works The abstract Activity class is a base class for all activities in WF4.

This abstract class defines the basic properties, method, and structure for all activities. We can directly create a concrete activity by inheriting this Activity class.

In real workflow applications, when we need a complex flow control activity that was not provided in the built-in activities, we can use this Activity class to create a new one. We can put our logic code in its Execute method. In this task, we are going to create an activity that will write data to a text file.

Then replace all default code with the following code: using System; using System. StreamWriter fileName. Get context ; file. Sleep ; file. Next, create a workflow as shown in the following screenshot: Save and build the solution. Run it: Alter the Main method of the Program. Using CodeActivity is very simple; it is used to create simple leaf activities.

The only thing we need to take care of is overriding the Execute method. The method will be called when the activity is executed. Then, replace all code that is created by default with the following code: using System. MailMessage ; mailMessage. Add to.

Get context. ToString ; mailMessage. Get context ; mailMessage. MailAddress from. SmtpClient ; smtp. Get context ; smtp. NetworkCredential userName. Get context , password. Send mailMessage ; result. Set context, “Sent Email Successfully! Create the workflow as shown in the following screenshot: Chapter 5 Save and build the solution. Sending an e-mail usually costs some time. Show description. The standard C library. Prentice Hall’s most crucial C programming name in years.

To-the-point, authoritative, no-nonsense suggestions have continually been a hallmark of O’Reilly books. The In a Nutshell books have earned a fantastic acceptance within the box because the well-thumbed references that take a seat beside the an expert developer’s keyboard. Seasoned SharePoint Branding and Responsive internet improvement is the definitive reference at the applied sciences, instruments, and strategies wanted for construction responsive web pages and purposes with SharePoint Voransicht des Buches ».

Was andere dazu sagen – Rezension schreiben. Activities System. Run Windows Form Workflow Application Workflow Console Application workflow designer project workflow instance workflow project workflow service workflow without debugging WorkflowInvoker.

Account Options Anmelden. Meine Mediathek Hilfe Erweiterte Buchsuche. Packt Publishing Amazon. Microsoft Windows Workflow Foundation 4. Andrew Zhu. This is a fast-paced and to-the-point handbook, it takes you through the important aspects that you need to know when working with Windows WF. The range of topics that we cover in this book is driven by what the working developer needs to know. It is neither a comprehensive reference to the whole WF architecture, nor a strategic guide to the complete application development lifecycle.

If you find yourself working with Windows Workflow Foundation 4. With this book, you will be able to enhance your applications with flexible workflow capabilities using WF 4. To follow the recipes, you will need to be comfortable with. Voransicht des Buches ».

Was andere dazu sagen – Rezension schreiben. Activities System. Run Windows Form Workflow Application Workflow Console Application workflow designer project workflow instance workflow project workflow service workflow without debugging WorkflowInvoker.

NET applications. Bibliografische Informationen. MicrosoftWindows Workflow Foundation4 0Cookbook.

The range of topics that we cover in this book is driven by what the working developer needs to know. It is neither a comprehensive reference to the whole WF architecture, nor a strategic guide to the complete application development lifecycle.

If you find yourself working with Windows Workflow Foundation 4. With this book, you will be able to enhance your applications with flexible workflow capabilities using WF 4. Next, the Assign activity will generate a divided-by-zero exception due to the setting of 0 as the value of the Variable num2. Create workflow code: Add a new class file to the project and name it CompensationWorkflow. Create host code: Open the Program. Invoke cw. How could a compensate activity know which CompensableActivity it is going to compensate?

We use CompensationToken to link them together. Performing confirmation by using Confirm activity Like performing compensation, we can also perform confirmation by explicitly using a Confirm activity. Confirmation will also be triggered when workflow is successfully finished. Create workflow code: Add a new class file to the project and name it ConfirmationWorkflow.

Then fill the file with the following code: using System; using System. If we have a careful look at the result, we shall see that compensableActivity1 and compensableActivity2 execute one after the other, and then the confirm activity executes as the confirm activity is linked to CompensableActivity2 by token.

The ConfirmationHandler executes and prints a line of message to the console. When the workflow finishes successfully, the ConfirmationHandler of CompensableActivity1 will take action automatically and print a line of message to the console. Printing collection items In this task, we will customize an activity that can print all collection items to Console Application. Manipulating Collections How to do it 1. Refer to the following screenshot: Open the CollectionPrinter.

Generic; using System. Get context ; if collection. WriteLine item. WriteLine “Collection is empty. Build the project: Build the project so that the custom activity will appear in the toolbox. Create a visual workflow: To create visual workflow, we need to perform the following actions: i.

Open the default created workflow file Workflow1. Drag a Sequence activity to the design panel. Drag a CollectionPrinterActivity activity onto the Sequence activity. A dialog box will appear asking us to choose type; here we choose String.

Click the Imports button and type in System. ObjectModel to imported the namespace System. ObjectModel to this workflow. The following is the final workflow: 5. In this task, we created an activity that can accept generic type Collection object. We will use this activity throughout this chapter. We need to make sure we have finished this task before moving ahead.

There’s more We can also use CollectionPrinterActivity in code-style workflow. To create a corresponding workflow in code, open the Program. Invoke new Workflow1 ; WorkflowInvoker. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinterActivity activity in this task. Create a visual workflow: We need to perform the following actions: i. Open the Workflow1.

ObjectModel to import the System. ObjectModel namespace to this workflow. Drag a Sequence activity to the workflow designer and then drag an AddToCollection activity onto the Sequence activity. Add a new ICollection variable named people to the Sequence’s scope. We can see the workflow shown in the following screenshot: Chapter 4 iii. Set the properties of the AddToCollection activity as shown in the following screenshot: iv. Set the properties of the CollectionPrinter activity: Manipulating Collections 3.

We will see: How it works The AddToCollection activity will append the new item to the end of the collection object. If we want to insert an item to a specified position, we may need to create our own activity to do this.

There’s more We can also use the AddToCollection activity in code-style workflow. To use AddToCollection in code workflow, open the Program. Invoke new Workflow1 ; Using ClearCollection activity In this task, we will use the ClearCollection activity to clear the content of a collection object. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinter activity in this task.

Create a visual workflow: Perform the following steps in order to create a visual workflow: i. Drag a Sequence activity to the workflow designer and then drag a CollectionPrinter activity to the designer panel two times to add two CollectionPrinter activities to the designer panel. Next, drag a ClearCollection activity between the two CollectionPinter activities—the type is String.

We can see the workflow as shown in the following screenshot: iii. Set the properties of both the CollectionPrinter activities: Chapter 4 iv. Set the properties for the ClearCollection activity: 3. By using this activity, we can remove all collection items, so that we can reuse the collection variable again rather than defining a new one.

Open the program. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use the CollectionPrinterActivity in this task. Create a workflow: We need to perform the following tasks to create a workflow: i. Drag a Sequence activity to the workflow designer panel. Next, drag CollectionPrinter activity to the designer panel two times. Set the properties of both the CollectionPrinter activities: iv.

Set the properties of the RemoveFromCollection activity: Chapter 4 3. The Result property of RemoveFromCollection activity indicates whether or not an item is deleted successfully. If the item exists and is deleted by this activity, then the Result property will be assigned a True value. Generic; System.

Invoke new Workflow1 ; Chapter 4 Using ExistsInCollection activity In this task, we will use the ExistsInCollection activity to check whether or not a specified item exists in the collection object. Getting ready We need to make sure we have finished the task of Printing collection items for us to be able to use CollectionPrinterActivity in this task.

Create a workflow: We need to perform the following actions to create a workflow: i. Drag a Sequence activity into the designer panel. Now drag a WriteLine activity below the ExistsCollection activity.

Add a Boolean type variable result to the Sequence’s scope. Set the propertes of the CollectionPrinter activity: iv. Set the properties of the ExistsInCollection activity: Chapter 4 v. Set the Text property of the WriteLine activity as follows.

ToString 3. It is a simple activity by which we can test whether or not a specified item exists in a particular collection object.

Please note that we have to set the correct TypeArgument for this activity. WF4 provides some build-in activities that can be used directly in the workflow designer panel. But many times, we need to create our own activities—for example, an activity that can send e-mail to inform someone about finishing a task or any other important thing. To define our own activity, we should write a class that implements the root abstract Activity or one of its predefined subclasses.

Custom Activities The following is the activity modeling class hierarchy diagram: This chapter intends to provide readers not only with some additional activities besides the built-in activities, but also with some concepts on how to build our own activities.

Before moving ahead, please create two projects. The first is the ActivityLibrary project named ActivityLibrary. Delete Workflow1. We will use these two projects throughout this chapter. The ActivityLibrary project is for all customized activities, whereas the WorkflowConsoleApp project is used for testing our customized activities. The following screenshot shows the project structure: Creating an activity by inheriting the root activity The abstract Activity class is the root of all subactivity classes.

In this task, we will create a custom activity inheriting directly from Activity. Customize an Activity: Add a new code file MyActivity.

Add a reference to ActivityLibrary: In the WorkflowConsoleApp project, add an assembly reference to ActivityLibrary for us to be able to use these customized activities in the WorkflowConsoleApp project. Please note that when we add a new workflow to the project, we actually select Activity in the Add New Item dialog.

Drag a Sequence activity to the designer panel. Drag a WriteLine activity into the Sequence activity and input Workflow start… in the textbox.

Drag MyActivity below the WriteLine activity. Check the Program. We should see the following: How it works The abstract Activity class is a base class for all activities in WF4.

This abstract class defines the basic properties, method, and structure for all activities. We can directly create a concrete activity by inheriting this Activity class. In real workflow applications, when we need a complex flow control activity that was not provided in the built-in activities, we can use this Activity class to create a new one.

We can put our logic code in its Execute method. In this task, we are going to create an activity that will write data to a text file. Then replace all default code with the following code: using System; using System.

StreamWriter fileName. Get context ; file. Sleep ; file. Next, create a workflow as shown in the following screenshot: Save and build the solution. Run it: Alter the Main method of the Program. Using CodeActivity is very simple; it is used to create simple leaf activities. The only thing we need to take care of is overriding the Execute method. The method will be called when the activity is executed. Then, replace all code that is created by default with the following code: using System. MailMessage ; mailMessage.

Add to. Get context. ToString ; mailMessage. Get context ; mailMessage. MailAddress from. SmtpClient ; smtp. Get context ; smtp. NetworkCredential userName.

Get context , password. Send mailMessage ; result. Set context, “Sent Email Successfully! Create the workflow as shown in the following screenshot: Chapter 5 Save and build the solution. Sending an e-mail usually costs some time. In real workflow applications, we should create an asynchronous activity or an independent WF service to send e-mail. We can use Bookmark to achieve this. In this task, we will create an activity using Bookmark, which will function as a message input activity.

Then, replace all the default code with the following code: using System. CreateBookmark bookmarkName. Create a workflow as shown in the following screenshot: Chapter 5 When we drag the InputMessage activity to the workflow designer panel, we will see a dialog that will let us choose the type of the message we want to send to the workflow. In this task we choose String. ResumeBookmark bkName, Console. When the workflow runs, input Hello bookmark and the workflow prints the input message out.

If we want to create an activity with Bookmark or a composite activity for example, we want to create our own Sequence activity , then we should use NativeActivity. NativeActivity is more powerful and flexible than CodeActivity. However, we need to learn more about WF runtime and the NativeActivity class.

A bookmark is actually a named and resumable pause point. When an activity with a bookmark is executed, the activity will stop and wait for input. In workflow host, when the ResumeBookmark method with parameters bookmarkname and input value is called, the workflow will come out of the pause state and resume execution, and will keep executing until it competes or takes a pause for another bookmark.

Usually, every WebRequest call requires some time span—several seconds or even minutes. If there is only one request, we can wait for the response. But what are we going to do if we have to make more requests, say —every request uses several seconds, and so requests will hang our program.

But it is quite expensive to initialize a thread. If one is writing. Apparently, multiple threads are not an option. So what should we do? In this task, we will create a CodeActivity that can call a method asynchronously. Then replace all default created code with the following code: using System; using System. Net; using System. Create this. Get context ; context. Create a workflow as shown in the following screenshot: 3. When the BeginExecute method finishes, it will return the callback delegate to its caller: Sequence.

At the same time both the workflow and the HTTP request are executing asynchronously. Once the HTTP response data is ready, the callback delegate will be executed automatically. Is it possible to create our own composite activity? Well, the answer is we can. For demonstration purposes, we will create a MySequence activity in this task. Create a code workflow to test the MySequence activity: Open the Program. First and the most important thing to create a custom composite activity is that we should inherit from NativeActivity or Activity.

We cannot create a composite activity using CodeActivity. The metadata object is used for storing workflow information. By accessing metadata, the workflow instance is aware of its child activities, variables, and arguments. With the help of ScheduleActivities, we can determine child activities’ execution behavior. We might get confused by the OnActivitCompleted method—why do we need such a method, can we just schedule activities with the help of the following code?

Creating an Activity Designer for the SendEmail activity An Activity Designer is actually a surface of an activity in the workflow designer.

We have already created a SendEmail to send an e-mail. In this task, we are going to create a designer activity surface for it. The final appearance will be like this: Now,let’s create it from scratch. Now, open the code sample for this book and just copy the following code to replace the default created code in SendEmailActivityDesigner.

Set context, “Sent Email successfully! Fill out the e-mail properties. The final workflow appears as shown in the following screenshot: Chapter 5 How it works This task demonstrates the following: ff Creating a custom Activity Designer with ExpressionTextBox: ModelItem is an object that can be used to draw workflow items in Workflow Designer.

The following illustration describes the layer infrastructure of Workflow Designer not Activity Designer : ff Creating a custom Activity Designer with a “collapsed” and “expanded” view. You can create a Activity Designer with a “collapsed” and “expanded” view by following the following XAML style: Custom Activities collapsed Expanded Define all possible views and present style under DataTemplate element.

Under Grid element, use a ContentPrensenter to represent the final view. In this task, we are going to create a designer for it. Use the following code to replace the default generated code: 2.

Add the following statement right above the MySequence class definition: [Designer typeof MySequenceDesigner ] Save the solution and build it by pressing the F6 key. Create the workflow as shown in the following screenshot: Save and build the project. This task demonstrates creating a custom activity using WorkflowItemsPresenter. By using WorkflowItemsPresenter, we can create an activity that contains multiple activities. We can define our spacer template in SpacerTemplate.

In this task, we use a black circle to represent the spacer. If we wish to create a triangle spacer, we need to replace the following: with the following: Now save and build the project. In the old WF3, we usually call them as services. In WF4, these features are implemented as extensions. The Tracking extension in WF4 can record the “foot prints” of the execution of a workflow instance. The Persistence extension in WF4 can save running workflow instances in durable storage such as a database or disk file.

Name the solution as Chapter After refreshing the node, we should see: 4. Create a workflow host: Open Program. Tracking; using System. Threading; using System. Add etwTrackingParticipant ; wfApp. After running the workflow, right-click the Analytic node, and select Refresh. We will see the following: Chapter 6 How it works To understand WF4 tracking, we need to understand three primary components: ff The TrackingRecord object holds all the tracking data. In this task, EtwTrackingParticipant is a specified TrackingParticipant, using which the workflow host can emit tracking records to the event viewer.

We can use predefined keywords to record states we need. Consider the following example: trackingProfile. Creating FileTrackingParticipant We may want to create our own tracking participant and store tracking information in a text file. In this task, we are going to create such a tracking participant. Create a custom tracking participant—FileTrackingParticipant. Tracking; using System; using System. WriteLine “Tracking Started” ; sw. WriteLine record.

ToString ; sw. Executing, ActivityStates. Add fileTrackingParticipant ; wfapp. Run ; WF4 Extensions waitHandler. After running, we can see a file suffixed with. To create a custom tracking participant, the key is overriding the Tracking method. In this method, we can write code to store tracking information to any place of our choice. In the Tracking method, we can manipulate the tracking data in a lot of ways— for example e-mail it or send it out by web service. Configuring the SQL persistence store In real-world applications, to make sure the performance meets requirements, it is recommended to use a database as the workflow persistence store.

WF4 has a built-in SQL persistence store type. All we need to do is some configurations. I would prefer to write a batch file to do all these steps.

Create a file named CreateSqlPersistenceDatabase. In the same folder, create a batch file named SetupSqlPersistenceStore. Double-click SetupSqlPersistenceStore. Create a workflow: Open the Workflow1. Set the Duration property of the Delay activity to 1 second. Once the Delay activity is executed, the workflow will become idle and the whole workflow instance will be persisted in the database. Create a workflow host: Add project references to System. DurableInstancing and System.

DurableInstancing; using System. The running workflow instance will be persisted in the database once the Delay activity is executed. We can query the [System. InstancesTable table against the PersistenceDatabase database to see the persisted workflow instance data. The Delay activity can induce the workflow to be idle, and the workflow will be persisted in the persistence store.

Please note that after the workflow is persisted and unloaded from memory, the workflow instance will not be resumed from the persistence store even after the delay time.

We need to resume the workflow instance manually or we can write a host service to monitor the time and perform the task of resuming the workflow. NET Certification Review. A boy creates ten paintings in this counting book that also explores the relationship of words within words.

Turn the page, peep through the window, and the word changes! This book was a Geisel Award Are computer and mobile operating systems converging? Tune in to learn more about Windows 8 in this episode of TechStuff.

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The redesigned Paint app in Windows 11 is getting some new-look options to match the style of the operating system. Microsoft has also fixed a bug so that when you click a colou. We live with our two sons, Milan, age 25, and Saaras, 22, and our daughter Ambar, 16, in a five-bedroom house in Loughton, Essex. But thanks to server quirks, many players quickly found themselves on the unarmed bot team, living fodder for other p. The era of Windows 11 is well and truly upon us, but it may be months before your current system is deemed compatible see our interview with the general manager of Windows on p Did you know you can paint your existing timber or uPVC windows?

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There are. Windows 11 has arrived, in all its round-cornered glory. And, spoiler alert, we quite like it — though maybe not as much as Microsoft would like. Incredibly, it so. Review must be at least 10 words. All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, Packt Publishing, nor its dealers or distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all the companies and products mentioned in this book by the appropriate use of capitals.

However, Packt Publishing cannot guarantee the accuracy of this information. Andrew Zhu has six years of experience of software development and information technology: three years in Java, three years in. Two and half years ago he joined Microsoft.

He has been supporting WF4 since its beta1 version. No book is the product of just the author—he just happens to be the one with his name on the cover. A number of people contributed to this book, and it would take more space than I have to thank each one individually. I must thank my colleague Steven Cheng and Packt acquisition editor Rashmi Phadnis—without you, I wouldn’t have a chance to write this book. You two stayed with me throughout the writing process.

I cannot imagine what could come out without your help. My thanks also go to the Copy Editor of this title Sanchari Mukherjee. To stick to the recipes, it is important to be pleased with.

Show description. The standard C library. Prentice Hall’s most crucial C programming name in years. To-the-point, authoritative, no-nonsense suggestions have continually been a hallmark of O’Reilly books.

The In a Nutshell books have earned a fantastic acceptance within the box because the well-thumbed references that take a seat beside the an expert developer’s keyboard.

WebNo deadline once you receive your Ebook downloadable PDF through your email, you can keep it forever and there is no deadline for using it; Interactive Features Easily highlight . WebOct 02,  · Downloads. Visual Studio; SDKs; Trial software. Free downloads; Office resources; Programs. Subscriptions. Overview; Administrators; Students. Microsoft . WebIt is a fast moving and to-the-point guide, it takes you thru the $ elements it’s good to recognize whilst operating with home windows WF. the diversity of subject matters that . WebWindows Workflow Foundation (WF) is a significant part replace.me Framework WF makes workflow technology available to every single programmer that uses replace.me . WebOct 02,  · @Andrew Zhu, Can you let me know, when the book will be published. I pre-ordered the ebook, but not sure when that will be out. · Hi, Packt told me that they will.