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7
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Basic Activity Operations
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3. With the Terminate activity in place, select its Error property and type This is an example termination error... (again with quotes) in the associated property edit control. Note
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The tip I provided in the preceding section holds true here as well. You can use a literal string, as we re doing here, or you can bind the string to an activity field, property, or dependency property.
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4. Compile the application by choosing Build Solution from Visual Studio s Build menu. After correcting any compilation errors, press F5 or Ctrl+F5 to run it. If all goes as expected, you ll see something like the following:
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Terminate, like Suspend, is a fairly simple activity, but a powerful one. You won t often need it, but when things go so badly for your workflow that you can t continue, Terminate is the best tool in the Toolbox. If you want to continue to the next chapter, keep Visual Studio 2005 running and turn to 8. If you suspended a workflow instance somewhere along the way in this chapter, resume it! (Just kidding...) If you want to stop, exit Visual Studio 2005 now, save your spot in the book, and close it. Terminate seems like a good alternative at this point...
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Part II
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7 Quick Reference
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To Use the Sequence activity Do This SequenceActivity is a composite activity, and as such it acts as a drop site for other activities. Simply drag and drop an instance of the Sequence activity onto the workflow visual designer. Then drag and drop other activities onto SequenceActivity as necessary to complete your workflow. Those activities will be executed in the order they appear in the designer, from top to bottom. With the visual workflow designer visible and active, drag an instance of the Code activity onto the surface and drop it into the workflow process as appropriate. Then provide an ExecuteCode method name in the Properties window. Populate that method with the code you want to execute. With the visual workflow designer visible and active, drag an instance of the Throw activity onto the surface and drop it into the workflow process as appropriate. Then assign the Fault and FaultType properties to provide the Throw activity with the exception to throw as well as the type of exception it should expect. With the visual workflow designer visible and active, and with the Fault Handlers view showing, drag an instance of the FaultHandler activity onto the surface and drop it into the workflow process as appropriate. Then assign the FaultType property to assign the type of exception it will handle. With the visual workflow designer visible and active, drag an instance of the Suspend activity onto the surface and drop it into the workflow process as appropriate. Then assign the Error property to assign the error string value it will report to the workflow runtime via the WorkflowSuspended event. With the visual workflow designer visible and active, drag an instance of the Terminate activity onto the surface and drop it into the workflow process as appropriate. Then assign the Error property to assign the error string value it will report to the workflow runtime via the WorkflowTerminated event.
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Use the Code activity
Use the Throw activity
Use the FaultHandler activity
Use the Suspend activity
Use the Terminate activity
8
Calling External Methods and Workflows
After completing this chapter, you will be able to:
Build and call local data services that are external to your workflow Understand how interfaces are used to communicate between the host process and your workflow Use external methods designed to transfer data between you workflow and host application Invoke additional workflows from within an executing workflow
As I was writing the preceding chapters, I kept thinking to myself, I can t wait to get to the part where we return real data to the host application! Why Because as interesting as workflow is, there is only so much you can do to demonstrate activities and workflows without returning something realistic to the executing application. Theoretically, there might be an infinite number of interesting workflow examples and demonstrations I could write that only processed initialization data (such as the postal code example you saw in 1, Introducing Microsoft Windows Workflow Foundation ). But things become far more interesting, and to be honest, far more realistic when we kick off a workflow that seeks and processes data from external sources and returns that data in some processed form to our application. So why not just crack open an object and start sending data into an executing workflow, or from an executing workflow to the host application Actually, you can do this with existing technology outside Windows Workflow Foundation (WF) using some form of marshaled communications, such as .NET Remoting or an XML Web service. Marshaling, sometimes also called serialization, is a process whereby data is converted from its original form into a form suitable for transmission between different processes and even between different computers. Why mention marshaling Because your workflow is executing on a different thread than your host process, and passing data between threads without proper marshaling is a recipe for disaster for reasons beyond the scope of this chapter. In fact, your workflow could be in a persisted state at the time you tried to send it data. It s not on a different thread...it s not even executing. But wouldn t a .NET Remoting connection or an XML Web service be considered excessive if we just want to pass data between our workflow and the host process that s controlling it Absolutely! And this is the premise of this chapter how we can establish local communications. We ll be setting up the systems necessary to satisfy the thread data-marshaling
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