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3
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Workflow Instances
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Adding a sequential workflow project to the WorkflowHost solution 1. If Visual Studio isn t running, start Visual Studio 2005 as you did in the previous chapters. If the WorkflowHost project isn t loaded, select it from the Visual Studio Recent Projects menu, which you can access from the main File menu. Visual Studio will grind for a moment as it reloads WorkflowHost for editing. 2. We could, if we wanted, add a workflow-based class directly into our WorkflowHost project. This is precisely what Visual Studio did when it created the PCodeFlow application in 1. Instead of simply adding a workflow component to our existing WorkflowHost application, however, let s add an entirely new workflow project to our solution. To do that, select Add and then New Project from the Visual Studio File menu. This will activate the Add New Project dialog box.
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Note
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It s generally a better practice to build your workflow into separate assemblies. For one thing, it neatly compartmentalizes your code along assembly lines. But for another, at the time this was written there is a bug in WF that prevents you from executing secondary workflows from within a primary workflow if the two workflows in question are in the same assembly.
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3. When the Add New Project dialog box appears, expand the Visual C# tree node and then select Workflow from the Project Types pane.
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Part I
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Introducing Windows Workflow Foundation (WF)
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4. Select Sequential Workflow Library from the Templates pane. 5. In the Name field, type LongRunningWorkflow. 6. In the Location field, type \Workflow\3. Note Remember that the path \Workflow represents the file system directory path you are using to store the book s sample applications. 7. Click OK to add the LongRunningWorkflow project to your WorkflowHost solution. Visual Studio then adds the new library assembly project to our solution and opens the workflow visual designer in preparation for creating our workflow task. Just to give you the big picture, we re going to add three activities to this new workflow task two Code activities and one Delay activity. The Delay activity will be sandwiched between the Code activities, allowing us to pop up message boxes before and after the delay. We ll delay a fixed amount of time at first, but we ll later modify the workflow task to accept a delay value we specify when we initiate the workflow. Building the simulated long-running sequential workflow 1. With the workflow visual designer active, 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 from the LongRunningWorkflow project in the Solution Explorer pane and click the Solution Explorer s View Designer button.
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3
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Workflow Instances
2. Select Code from the Toolbox, and drag the Code activity component onto the workflow designer s surface.
As the mouse approaches the area marked Drop Activities to Create a Sequential Workflow, the designer view changes slightly to indicate that you can drop the Code activity component on the designer surface.
Part I
Introducing Windows Workflow Foundation (WF)
3. Release the mouse button to drop the Code activity component into the sequential workflow.
4. As we did in the first chapter, we re going to add some code to our workflow task via the Code activity. If the Code activity s properties aren t showing in the Visual Studio Properties pane, click the Code activity you just inserted into your workflow once to select it. This will bring this activity s properties into view. 5. Click the ExecuteCode property to activate the property drop-down edit box, which allows us to name the event that will fire when the code in the Code activity is to be executed.
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