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

Using the Pick activity

The Pick activity in WF4 is similar to the Listen activity in WF3. 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.

How to do it...

  1. Create a workflow project:

    Create a new Workflow Console Application and name it UsingPickActivity.

  2. Create a workflow:

    Create a workflow as shown in the following screenshot:


    We are not allowed to define variables in the Pick activity scope.

    Set the Properties of the Delay activity of Branch1:

    Set the Properties of the Delay activity of Branch2:

  3. Create a workflow host:

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

    using System;
    using System.Activities;
    using System.Activities.Statements;
    using System.Threading;
    namespace UsingPickActivity {
        class Program {
            static void Main(string[] args) {
                AutoResetEvent waitHandler =