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If you need to handle some specific processing once your activity has been loaded into the workflow runtime but before it is executing, a great place to do that is in the Initialize method. You would perform similar out-processing in the Uninitialize method. The OnActivityExecutionContextLoad and OnActivityExecutionContextUnload methods signify the activity loading into the workflow runtime and the activity s removal from it, respectively. Before OnActivityExecutionContextLoad is called, and after OnActivityExecutionContextUnload is called, the activity is in an unloaded state from a WF perspective. It might be serialized into a queue, stored in a database, or even on disk waiting to be loaded. But it does not exist in the workflow runtime before or after these methods are called. Cancel, HandleFault, and Compensate are all called when the obvious conditions arise (canceling, faulting, and compensating). Their primary purpose is to perform any additional work you want to perform (logging, for example), although Compensate is where you truly implement your transaction compensation. (See 15, Workflows and Transactions. ) Keep in mind that at the point these methods are called, it s too late. You can t revive a transaction
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by the time your activity is asked to compensate for failure, and you can t undo an unhandled exception or stop a cancel request. All you can do is perform cleanup or other processing as required, and in the case of Compensate, actually provide the compensation function for the failed transaction. Execute is probably the most overridden Activity virtual method, if only because this is the method you override to perform the work that the activity was created to perform.
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Although it s certainly true that you ll need to write the custom activity code itself, fully developed WF activities carry with them additional code to support non-workflow-related behavior, mostly to provide a richer developer experience in the visual workflow designer. For example, you might want to provide a validator object that checks for inappropriate activity configurations and fires back error messages to that effect. Or you might need to provide a ToolboxItem or ToolboxBitmap to better integrate with the Visual Studio Toolbox. And believe it or not, you can actually adjust the way your activity looks when dropped into the visual workflow designer through modifications to the activity theme, with which you work using a specialized designer class. The sample activity in this chapter implements all these things to demonstrate their purpose and impact.
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As you might recall, there are two types of activities: basic (single-purpose) and composite (containers). You might think that the major difference between them is that one is a lone activity and the other contains embedded activities. And this is certainly one of the major differences. But there are other important differences as well, not the least of which is how an activity works with an execution context. Activity execution contexts, introduced in 4, are simply a way for WF to keep track of important things, such as from which workflow queue a given activity is working. But it also provides a mechanism for activity control and a way for WF to enforce rules between activities when they re executing. An interesting aspect of activity execution contexts is that the context your workflow instance starts with might not be the context being used inside your custom activity. Activity execution contexts can be cloned and passed to child activities, which always happens for iterative activities. But for our purposes here, probably the most important things to remember when creating custom activities, at least with respect to activity execution context, are that the execution context maintains the current execution status and that when you override the virtual methods you find in System.Workflow.Activity, only certain status values are valid. Table 13-2 shows which execution status values apply to the overridden System.Workflow.Activity methods. Compensate is somewhat of an exception because it s not a System.Workflow.Activity virtual method. Rather, it s the lone method resident in ICompensatableActivity, which is
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