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CHAPTER 9 s .NET 3.0: WINDOWS WORKFLOW FOUNDATION
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WF is at its heart a programming model along with the runtime engine and the tools to create workflow applications. The programming APIs are encapsulated in the .NET 3.0 namespace System.Workflow. The best place to get started is with the tools themselves. They are available already with Visual Studio 2008, or as an add-on to Visual Studio 2005. Please note that if you have downloaded and installed the Orcas add-ons for Visual Studio 2005, WF is not included. It is a separate download that can be obtained from the Windows Vista downloads section of MSDN, at http://msdn2.microsoft.com/en-us/ windowsvista. You ll look at the workflow templates in Visual Studio in the next section. Just as a real business process is composed of a number of activities connected by rules and flow, a WF process application also uses activities, of which the template provides many out-of-the-box activities dealing with branching, input/output, managing external services and activities, and so on. You can also compile your own activities into an activity library that can be reused by other workflow applications. In addition, a workflow can of course contain another workflow as an activity within it. The next component in the WF architecture is the WF runtime engine. This executes the workflow, handling scheduling, rules, and everything necessary to make the workflow run as intended and designed. When long-running stateful transactions are needed, the workflow will often need to be persisted to save on resources when it isn t being used. Finally comes the host process. The WF runtime engine is not an executable environment. You have to host it within an application, be it a console, Windows, or web application, in order for it to work. Thus, you can, for example, embed a workflow application in your web site that gets executed upon filling in a form on a web page, or you can host it to an external web service that gets called from your web applications, but the WF activity runs on the ASP .NET server that manages the web service. Any application can host a WF process as long as it is capable of invoking the .NET 3.0 runtime.
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To build a workflow application using Visual Studio, select File New Project. In the New Project dialog, select Workflow as the project type (available to C# and Visual Basic), and you ll see the available project templates (see Figure 9-1).
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CHAPTER 9 s .NET 3.0: WINDOWS WORKFLOW FOUNDATION
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Figure 9-1. Creating a new WF application
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The available templates are as follows: Sequential Workflow Console Application: This contains a simple sequential workflow and the code for a Windows console application that can host it. Sequential Workflow Library: This contains a simple sequential workflow that can be published as an activity or a web service. Workflow Activity Library: This allows you to create a new activity for the WF Toolbox. State Machine Workflow Console Application: This contains a state machine workflow and the code for a Windows console application that can host it. State Machine Workflow Library: This contains a simple state machine workflow that can be published as an activity or a web service. Empty Workflow Project: This provides a simple workspace that allows you to add your own workflow application types. You can experiment with these to find the template that best suits you. For this example, you will step through building a simple sequential workflow console
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CHAPTER 9 s .NET 3.0: WINDOWS WORKFLOW FOUNDATION
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application called FirstWorkFlowApp (see Figure 9-1). And, yes, if you were wondering this will be a Hello World application! When you create this application using the template, you ll be taken to the Visual Studio IDE with the Workflow Designer open, and the set of available activities open in the Toolbox (see Figure 9-2).
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