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Part II
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Working with Activities
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execution by setting the ConditionalEventArgs Result property to false (true terminates the loop) when handling UntilCondition. Table 9-1 outlines the Replicator activity properties we need to be concerned with, while Table 9-2 lists the events we need to handle when using the Replicator activity in our workflows.
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Table 9-1 Method ExecutionType
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Replicator Activity Properties
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Purpose Gets or sets the ExecutionType (the enumeration) for the Replicator activity. The ExecutionType enumeration contains the values Parallel and Sequence. Gets or sets a list of child activity data. This property is similar to the data-binding properties found in other .NET technologies, and in fact the object assigned to this property must be based on IList. The Replicator activity creates child activity instances for each of the items in the IList-based collection assigned to this property.
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InitialChildData
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Table 9-2 Method
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Replicator Activity Events
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Purpose Fired when the child activity instance of the Replicator activity has completed. This is fired once for each replicated activity. Fired when the child activity instance of the Replicator activity has initialized. This is fired once for each replicated activity. Fired when the Replicator activity has completed (that is, when all replicated instances of the child activity have completed their execution). Fired when the Replicator activity begins to execute. This event is fired just once, prior to any child activity execution. Although listed in much of the WF documentation as a property, UntilCondition represents an event handler in much the same way the ExecuteCode property represents an event handler to execute the code associated with a CodeActivity. This event is fired prior to the execution of each child activity instance. The ConditionalEventArgs event arguments control the continued execution of the loop. Assigning Result a value of false allows the next child activity to execute. Assigning Result a true value causes the Replicator activity to stop the execution of all subsequent child activities.
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ChildCompletedEvent ChildInitializedEvent CompletedEvent
InitializedEvent UntilCondition
Although Tables 9-1 and 9-2 are useful in describing the properties and events the Replicator activity exhibits, I think a diagram is also helpful to show the timing. Figure 9-3 provides you with a basic flowchart showing which events are fired and at what point. (I can hardly believe I worked so hard to learn Unified Modeling Language only to provide you with a flowchart!)
9
Fire Initialized Event
Logic Flow Activities
IList Collection
Replicate Child Activity
Test UntilCondition
ConditionalEventArgs.Result=True
ConditionalEventArgs.Result=False Fire ChildInitialized Event Fire Completed Event
Execute Child Activity
Done
Fire ChildCompleted Event
Figure 9-3
The Replicator activity event sequencing flowchart
The IList-based collection you see in Figure 9-3 is assigned to the InitialChildData property, either before or during the processing of the Initialized event. The flowchart also doesn t illustrate the fact that the replicated child activities (one for each element in the IList-based collection in InitialChildData) can be executed sequentially or in parallel, depending on the ExecutionType property setting. How do you actually use the Replicator activity From the description so far, it sounds a great deal more complicated than it really is. In fact, the mechanics aren t very different than for other activities. Drag an instance onto the workflow visual designer, assign values for the various event handlers, and drag a single child activity into the center of the Replicator activity. This single child activity, like the Replicator activity itself, can be a container (such as a Sequence activity), so more than one activity can in fact be executed. With these tables and figures in mind, let s rebuild the Questioner application using the Replicator activity. Creating the QuestionFlow workflow using the Replicator Activity 1. If you ve not already done so, open Visual Studio and open the Questioner application s solution from the \Workflow\ 9\Replicator Questioner. Click File, then Open, and then finally Project/Solution. Using the Open Project dialog box, browse until you find Questioner.sln and click Open.
Part II
Working with Activities
2. As with both preceding sections, the application is once again essentially complete so that you can concentrate on the workflow aspects. Select the Workflow1.cs file in Solution Explorer s tree control, and click the View Designer toolbar button to load it into the Visual Studio workflow visual designer. 3. When Workflow1 is ready for editing in the workflow visual designer, drag an instance of Replicator from the Toolbox to the designer s surface and drop it. This, of course, inserts an instance of the Replicator activity into your workflow.
4. In the Visual Studio Properties pane, select the Initialized property and enter InitializeLoop. Visual Studio inserts the event handler in your code and shifts you to the code editor. Return to the workflow visual designer so that you can continue setting properties.
5. For the Completed property, enter LoopCompleted to add the LoopCompleted event handler to your workflow code. Again return to the workflow visual designer.
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