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If this code looks familiar, it should. I literally cut and pasted it from the original PCodeFlow application and workflow found in 1.
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7. Choose Save All from the File menu, or press Ctrl+Shift+S. 8. Open a command window, type cd \Workflow\16\PCodeXaml\PCodeXaml at the command prompt, and press Enter to change directories. 9. Type "C:\Program Files\Microsoft SDKs\Windows\v6.0\Bin\Wfc.exe" workflow1.xoml workflow1.xoml.cs at the command prompt, and press Enter. 10. The workflow compiler crunches both the XML and C# files. When it is complete, it again produces a dynamic-link library workflow1.dll, which you now should reference. Right-click the PCodeXaml project name in Solution Explorer, and select Add Reference. When the Add Reference dialog box pops up, select the Browse tab, select workflow1.dll from the list, and click OK.
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16
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Declarative Workflows
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11. Turning to the main application, select the Program.cs file for editing. Select it, and scan through the code to find this line:
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Console.WriteLine("Waiting for workflow completion.");
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12. Add this code following the line of code you just found:
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// Create the execution parameters Dictionary<string, object> parms = new Dictionary<string, object>(); parms.Add("PostalCode", args.Length > 0 args[0] : ""); // Create the workflow instance. WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(Workflow1), parms); // Start the workflow instance. instance.Start();
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13. There is a slight problem with the project as it stands. You referenced the workflow1.dll assembly, but yet there is code to create the Workflow1 class resident in the code-beside file. This sets up a conflict as there are two instances of a class named Workflow1. Because you want the class defined in the compiled assembly, right-click the Workflow1.xoml and Workflow.xoml.cs files in Solution Explorer and select Exclude From Project to remove them from the compilation process. 14. Compile the solution by pressing F6, correcting any compilation errors. 15. To test the application, we ll use the command prompt window that should still be open from the workflow compilation. Change directories to the Debug directory (or Release if you compiled the application in Release mode). To do so, from the command prompt type cd bin\Debug and press Enter (substitute Release for Debug if you compiled in Release mode). 16. At the command prompt, type PCodeXaml 12345 and press Enter. You should see the following application output:
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Part III
Workflow Processing
17. To try a negative application response, at the command prompt type PCodeXaml 1234x and press Enter. You should get the following output:
The final sample we ll create in this chapter involves a custom class so that we can exercise XmlnsDefinition. Creating a new XAML-based workflow application with a custom activity 1. As I have for the previous sample applications, I ve again provided two versions of this sample: a completed version and an incomplete version, both of which you ll find in \Workflow\16\. The XmlnsDefFlow application is incomplete, but it requires only the workflow definition. The XmlnsDefFlow Completed version is ready for you to execute. If you d like to follow the steps here, open the incomplete version. If you d rather just follow along, then open the completed version. To open either version, drag the .sln file onto Visual Studio and it will open the solution you selected for you. 2. Add a new Workflow1.xml file. You don t need to change the compiler settings for this file or rename it just yet. 3. Add the following XML to the Workflow1.xml file, and then save it:
<SequentialWorkflowActivity x:Class="Workflow1" x:Name="Workflow1" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow" xmlns:custom="urn:PrintMessage"> <custom:PrintMessageActivity x:Name="printMessageActivity1" custom:Message="Hello from the custom assembly!"/> </SequentialWorkflowActivity>
4. Change the file extension from .xml to .xoml in Solution Explorer, again ignoring the warning. Save the file. The workflow is now complete, but notice the reference to PrintMessageActivity in the XML markup. This is a new, custom activity you need to create. To begin, right-click the solution name in Solution Explorer, select Add, and then select New Project. From the Workflow project types, select Workflow Activity Library, and in the Templates pane select Workflow Activity Library, type XmlnsDefLib into the Name field, and click OK.
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