generate barcode image vb.net Introducing Microsoft Windows Workflow Foundation in Visual C#

Encoder UPC-A Supplement 5 in Visual C# Introducing Microsoft Windows Workflow Foundation

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Introducing Microsoft Windows Workflow Foundation
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because there is less automatically generated code to wade through to build our examples. But from time to time we will create other types of projects, such as for custom workflow services, activities, and even a few Windows Forms applications. Note
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If you re new to Visual Studio 2005, welcome! You ll find it to be a rich development environment with a host of features and capabilities. You might find an additional resource handy, though, to guide you as you learn the system. John Sharp s excellent Microsoft Visual C# 2005 Step by Step (Microsoft Press, 2006) will prove invaluable as you learn Visual Studio 2005.
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Before editing code or inserting workflow items, take a moment and look at two of the files the workflow project generator created for you:
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This, in many respects, is a typical console application source file. However, the template added a great deal of code to support workflow operations. Understanding the code that is here is a major goal of this book, but we ll at least get a feel for what it s doing in this chapter.
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Workflow1.cs This is the workflow component we ll modify to validate the incoming postal
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code. It is the first of many you could add, but for now we ll just use this single workflow. The other files are typical of Visual Studio 2005 console projects. Something that is atypical, however, is the references Visual Studio 2005 automatically created for you. In addition to the System assembly, which any common console application would have referenced, Visual Studio 2005 added references to these assemblies:
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System.Data System.Design System.Drawing System.Drawing.Design System.Transactions System.Web System.Web.Services System.Workflow.Activities System.Workflow.ComponentModel System.Workflow.Runtime
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This is a nice feature to have when creating workflow applications using Visual Studio 2005. It s easy to forget to include an assembly when assigning references, so having the references created for you automatically helps speed your development process. Let s now turn our attention to building our workflow using the workflow visual designer.
Part I
Introducing Windows Workflow Foundation (WF)
Building a workflow 1. With the workflow visual designer showing, move the mouse cursor to the Visual Studio Toolbox and allow it to expand. If the workflow visual designer is not showing, select Workflow1.cs in the Solution Explorer pane and click the Solution Explorer s View Designer toolbar button.
2. Drag the IfElse activity component onto the workflow designer s surface. Activities are the building blocks of workflow applications, and the Toolbox contains the activities that are currently appropriate for your workflow. As the mouse approaches the Drop Activities To Create A Sequential Workflow area, the designer view changes slightly to indicate that you can drop the IfElse activity icon onto the designer surface. Note Visual Studio 2005 will place only the activities appropriate for your workflow application into the Toolbox. Other activities in fact are available, but Visual Studio won t present them in the ToolBox because they re not designed for use with the workflow type currently being edited. (We ll look at the different workflow types in 4, Introduction to Activities and Workflow Types. )
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Introducing Microsoft Windows Workflow Foundation
3. Release the mouse button to drop the IfElse activity icon into the sequential workflow.
We re now going to use the IfElse activity component to ask the following question: Does the string we ve provided contain a valid postal code We ll actually ask this question in code, using the regular expression code snippet you saw previously. Before we do, though, look closely at the workflow visual designer. The workflow designer is reminding us that we ve not yet provided code to make this decision. If you look at the upperright corner of the left branch, named ifElseBranchActivity1, you ll see a small circular icon with an exclamation mark inside. This is the workflow visual designer s way of telling you that the workflow is incomplete. If you attempt to compile a workflow project with these reminder icons active, you ll receive compilation errors. The workflow visual designer will tell you more about the error condition if you move the mouse over the icon and then click the down arrow that appears:
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