create 2d barcode c# Part I in Visual C#.NET

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Part I
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Introducing Windows Workflow Foundation (WF)
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and adequately test. The other workflow types are less complex and therefore easier to build and test. The goal is to model your system using the most appropriate workflow type. Often, you will find yourself using some combination of all three types in many real-world scenarios.
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The Sequence Activity
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So let s dig into the sequential composite activity a little more. Although we ve used this activity throughout the book so far, I intentionally delayed talking much about it until this point. Now that we have an understanding as to how the workflow runtime works with workflow instances, and know that workflow instances are really running versions of our workflow activities, we can better understand what s happening. Performing tasks sequentially means those tasks are executed in a specific order. First things first, last things last. A sequential activity is something like a to-do list. Record the first thing you need to do, then the next, and the next, until finally you record your last task. If these tasks are stored in a Sequence activity, WF will execute each and every task in precisely the order in which the tasks are specified. Note
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We won t be looking at dynamically adding activities in this book, but you should know this is possible. For our purposes, we ll be adding activities using Microsoft Visual Studio and executing them statically.
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In the case of Visual Studio, the workflow visual designer helps you lay out your workflow. When you create a sequential workflow application and open the root activity in the designer, the tasks you place at the top of the screen are executed first. Those toward the bottom are executed later. From a visual perspective, the sequence of activities runs from top to bottom. The Sequence activity is, of course, a composite activity.
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A specialized version of the Sequence activity is used as the root for sequential workflows SequentialWorkflow activity. The only difference between the two is that the SequentialWorkflow activity accepts parameters when it begins execution, allowing you to initialize your workflow with runtime initialization information.
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Note
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Building a Sequential Workflow Application
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Because we ve created a few sequential workflow applications so far in the book, I won t belabor their creation here. I will, however, repeat the steps for completeness.
4
Introduction to Activities and Workflow Types
Creating a sequential workflow application 1. In Microsoft Windows, click the Start button, move the cursor to All Programs, and then select Microsoft Visual Studio 2005 from the resulting menu. 2. Click the Microsoft Visual Studio 2005 icon to start Visual Studio 2005. 3. On the File menu, select New and then Project. The New Project dialog box will appear. 4. In the Project Types pane, expand the Visual C# tree node to show the project types available for the C# language. 5. Under the Visual C# node, click the Workflow node to display the workflow-based project templates. 6. In the Templates pane, click Sequential Workflow Console Application or Sequential Workflow Library. The former creates an executable application designed to execute in the Console window, while the latter creates a dynamic-link library other applications can use. Note Currently, you don t have the option of creating a Windows Forms application that contains workflow. If you need a graphical user interface with your workflow, either you ll need to create a sequential workflow console application and add the Windows Forms you require, or you ll need to create a typical Windows Forms application and add the workflow components as you did in the previous chapter as a library assembly. Because my personal style is to create workflows within individual assemblies, I prefer the latter approach, but either will do. 7. In the Name field, type the name of your project or application. 8. In the Location field, type the file system location where you would like your project files stored. 9. If the Create Directory For Solution check box is not already selected, select it. 10. Click OK. Visual Studio 2005 will now create the basic project for you and bring up the workflow visual designer user interface. At this point, you have the makings of an application that will execute sequential workflow instances. Simply drag and drop the activities you need from the Toolbox, adjust their properties to your needs, and continue with your application development. If you need to add more workflow library projects, you can do that as I described in the previous chapter, or simply add new workflow classes directly to your application. We ll see a great many more examples in the pages to follow because most workflow examples I ll present will be sequential by nature.
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