vb.net qr code dll Designing the Invitations Activity in VB.NET

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Designing the Invitations Activity
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Click Planning Activities in the navigation bar, which should display the Parallel activity that contains the Wedding , Reception , and Invitations activities. Double-click the Invitations activity. Drag a Sequence activity onto the Body section. Drag a Delay activity onto the Sequence and set the Duration property to TimeSpan.FromSeconds(4). Drag a WriteLine activity below this, set the DisplayName as Order Stationary, and enter the Text property as Body: The stationary has been ordered . Drag another Delay activity and set the Duration property to TimeSpan.FromSeconds(2). Drag a WriteLine activity
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CHAPTER 17 COMPENSATION, CONFIRMATION, AND CANCELLATION
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below this, set the DisplayName as Finalize List, and enter the Text property as Body: The invite list has been agreed to . The designer should look like the one shown in Figure 17-12.
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Figure 17-12. Body sequence of the Invitations activity
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Designing the Confirmation Activities
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Collapse the Body section and drag a Sequence activity to the Confirmation Handler section. Drag a WriteLine activity to the Sequence, set the DisplayName as Mail Invitations, and enter the Text property as Confirmation: The invitations have been sent . Drag another WriteLine activity below Mail Invitations , set the DisplayName as Display Confirmation, and enter the Text property as Confirmation: The invitations activities have been confirmed . Notice that the invitations are not actually mailed until the workflow completes. Like paying for the facility, you want to wait to mail the invitations until you know that the workflow activities have completed successfully. Collapse the Confirmation section and drag a WriteLine activity to the Cancellation Handler section and enter the Text property as Cancellation: The invitation activity has been cancelled . Click the Wedding Preparations activity in the navigation bar. This Sequence contains only the Planning Activities activity. Drag a WriteLine activity below it and enter the Text property as Main: Congratulations! The wedding preparations are complete. . The designer should look like the one shown in Figure 17-13.
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CHAPTER 17 COMPENSATION, CONFIRMATION, AND CANCELLATION
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Figure 17-13. The Wedding Preparation activity
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Running the Application
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Press F5 to run the application. You should see results similar to the following: Body: The reception facility has been reserved Body: The church has been reserved Body: The rehearsal has been scheduled Body: The menu has been decided Body: The reception deposit has been paid Body: The stationary has been ordered Body: The invite list has been agreed to Body: The flowers have been ordered Main: Congratulations! The wedding preparations are complete. Confirmation: The wedding plans have been confirmed Confirmation: The invitations have been sent
CHAPTER 17 COMPENSATION, CONFIRMATION, AND CANCELLATION
Confirmation: The invitation activities have been confirmed Confirmation: The reception facility has been paid for Confirmation: The reception activities have been confirmed Press ENTER to exit This represents the normal processing without any errors. Notice that the Body activities complete first, followed by the Congratulations line, which is the last of the regular activities to execute. The confirmation handlers are then executed.
Note If you started with the partial solution that is available from the website, you ll need to make the rest of the changes yourself.
Cancellation Handlers
Now, you ll make some changes to cause the workflow to fail and see how the handlers are executed. First, you ll exercise the cancellation handlers.
More on the Parallel Activity
The Parallel activity has a CompletionCondition property, as shown in Figure 17-14.
Figure 17-14. The Properties window of a Parallel activity When a Parallel activity is executed, it starts all its child activities simultaneously. As each branch completes, it evaluates the CompletionCondition property, if specified. If it evaluates to True, all branches still executing are aborted. If they are a CompensableActivity, as in this case, the cancellation handler will be executed.
CHAPTER 17 COMPENSATION, CONFIRMATION, AND CANCELLATION
Click the Wedding Preparations activity in the navigation bar and select the Planning Activities activity. In the Properties window, set the CompletionCondition property to True. Press F5 to run the application. Your results should be similar to the following: Body: The reception facility has been reserved Body: The church has been reserved Body: The rehearsal has been scheduled Body: The menu has been decided Body: The reception deposit has been paid Cancellation: The church reservation has been released Cancellation: The invitation activities have been cancelled Main: Congratulations! The wedding preparations are complete. Confirmation: The reception facility has been paid for Confirmation: The reception activities have been confirmed Press ENTER to exit The Reception activity is the first to complete and the cancellation handler was executed for the Wedding and Invitations activities. This is not considered an error condition, however, and the workflow completed. Notice that the confirmation handler was NOT executed for the Wedding and Invitations activities because they did not complete. This, obviously, is not how you want the workflow to function. Set the CompletionCondition property to False or just clear the property as it was originally.
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