Book Image

Microsoft Windows Workflow Foundation 4.0 Cookbook

By : Andrew Zhu
Book Image

Microsoft Windows Workflow Foundation 4.0 Cookbook

By: Andrew Zhu

Overview of this book

Windows Workflow Foundation 4.0 (WF) is a significant part of .NET Framework 4.0. WF makes workflow technology available to every single programmer that uses the .NET Framework 4.0. 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 4.0. The best thing about this book is that all recipes are based on real-world experiences of Andrew Zhu. Andrew is a global WF and BizTalk technology support engineer for Microsoft. 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.You will see recipes that illustrate integration of Windows Workflow with other applications such as WPF, ASP.NET, WCF service.Lastly, you will discover how easily you can customize W4 Designer with WF rule engine and others.
Table of Contents (15 chapters)
Microsoft Windows Workflow Foundation 4.0 Cookbook
About the Author
About the Reviewers

Testing a WF program with a unit test framework

In this task, we will create a Test Project to do unit testing for a WF program.

How to do it...

  1. Add a Test Project to the solution:

    Add a Test Project to the Chapter01 solution and name the project as UnitTestForWFProgram as shown in the following screenshot:

  2. Add a workflow file to the Test Project:

    Add a workflow activity to this project. Right-click the newly created Test Project, then go to Add | New Items… | Workflow | Activity and name the activity as WorkflowForTest.xaml. In the opening WF designer, create an OutArgument as OutMessage. Next, drag an Assign activity to the Designer panel and assign the string "Test Message" to the OutMessage argument as shown in the following screenshot:


    In WF4, workflow is actually an Activity class. We could see "Workflow" as a conception from a macroeconomic viewpoint, while considering "Activity" as a development concept.

  3. Create unit test code:

    Open the UnitTest1.cs file and fill the file with following code:

    using Microsoft.VisualStudio.TestTools.UnitTesting;
    using System.Activities;
    namespace UnitTestForWFProgram {
        public class UnitTest1 {
            public void TestMethod1() {
                var output = 
                    WorkflowInvoker.Invoke(new WorkflowForTest());
                Assert.AreEqual("Test Message", 
  4. Run it:

    Set UnitTestForWorkflow as Startup project. Press Ctrl+F5 to build and run the test without debugging as shown in the following screenshot:

How it works...

In the preceding code snippet, [TestClass] indicates it is a unit test class, whereas [TestMethod] indicates a test method. When the Test Project runs, the test method will be executed automatically.

There's more...

In real application development, we can also create a separate Unit Test project and add a reference to the target project.