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.NET 3.5 WF Support

With the release of .NET 3.5, the base class libraries now ship with a fourth WF-centric assembly

named System.WorkflowServices.dll. Here you will find additional types that allow you to build

WF-enabled applications that integrate with the Windows Communications Foundation APIs. The

most important aspect of this assembly is that it augments the System.Workflow.Activities name-

space with new types to support WCF integration. 

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Note

When you build any WF-aware Visual Studio 2008 project, the IDE will automatically set references to

each of the Windows Workflow Foundation assemblies.

Visual Studio Workflow Project Templates

As you would expect, the Visual Studio 2008 IDE provides a good number of WF project templates.

First and foremost, when you select the File ➤ New ➤ Project dialog box, you will find a Workflow

node under the C# programming category (see Figure 26-5). Here you will find projects that allow

you to build sequential and state machine workflows contained within a simple console or custom

*.dll assembly. 

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Figure 26-5.

The core WF project templates

In addition, you may recall from Chapter 26 that the Windows Communication Foundation

(WCF) node of the New Project dialog box also provides a set of WF templates. Here you will find

two project templates (Sequential Workflow Service Library and State Machine Workflow Service

Library), which allow you to build a WCF service that internally makes use of workflows. We will not

make use of this group of WF project templates in this chapter; however, do remember that when

you are building WCF services, you can elect to integrate WF functionality when creating a new

project.