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 ExistsInCollection<T> activity

In this task, we will use the ExistsInCollection<T> 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.

How to do it...

  1. Create a Console Workflow Application:

    Create a new Workflow Console Application and name it UsingExistsInCollectionActivity.

  2. Create a workflow:

    We need to perform the following actions to create a workflow:

    1. Open Workflow1.xaml, which is the workflow created by default. Click the Imports button and type in System.Collections.ObjectModel to import the System.Collections.ObjectModel namespace to this workflow.

    2. Drag a Sequence activity into the designer panel. Next, drag an ExistsInCollection activity right below the CollectionPrinter activity—the type is String. Now drag a WriteLine activity below the ExistsCollection activity. Add a new ICollection...