c# create data matrix CONDITIONAL ACTIVITIES in Visual C#

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CHAPTER 3 CONDITIONAL ACTIVITIES
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Figure 3-6. FirstState activity with While activity inside
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Conditional Activity Group
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The Conditional Activity Group (CAG) contains other activities. Each activity within the CAG contains a WhenCondition that determines whether that activity should be executed. Each time the CAG is executed, an UntilCondition is evaluated. If that condition is True, the CAG exists, and all activities that might be left will be cancelled. If that condition is False, then all activities within the CAG will be evaluated, and those whose WhenCondition evaluates to True will be executed. You can use this type of activity to execute multiple activities in parallel or in sequence by using the WhenCondition and UntilCondition.
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Conditional Activity Group Within Sequential Workflow
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Create a new VB Sequential Workflow Console Application called VBCAGSequentialExample. Add a CAG to the workflow and add a Code activity to the CAG. Give the Code activity a name of Code1 and generate the handlers. View the code of the workflow, add a private integer variable called IntCounter, and initialize it to 0: Private IntCounter As Integer = 0 Within the Code1_ExecuteCode sub, add a message box with the following code: msgbox("Code 1: Counter=" & IntCounter)
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CHAPTER 3 CONDITIONAL ACTIVITIES
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It will look like the following: Private Sub Code1_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Code 1: Counter=" & IntCounter) End Sub This displays Code 1 and the number stored in the variable. Run the workflow. Because there s no UntilCondition on the CAG activity, all activities are only executed once. View the code of the workflow and add a Code1WhileCondition with the following code, then set the Condition property of the Code1 activity to be this condition: Private Sub Code1WhileCondition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs) e.Result = IntCounter <4 IntCounter = IntCounter+1 End Sub This condition, and setting the property, causes the Code1 activity to execute each time the CAG executes and the IntCounter value is less than 4. Run the workflow again. Again, you get the same result: the Code1 message box only displays one time. This is because the overall CAG is only executing one time, because there s no UntilCondition on the CAG. View the code for the workflow, and this time add an UntilCondition sub with the same type of definition that the WhileCondition subs have had: Private Sub UntilCondition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs) e.Result = IntCounter = 4 End Sub This code executes all activities within the CAG that meet their own WhileConditions until the private variable is equal to 4. Remember this is an Until statement, so you can t use less than in this case. You could have the criteria be IntCounter>4, which would execute the activities as long as IntCounter was less than or equal to 4: Private Sub UntilCondition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs) e.Result = IntCounter>4 End Sub After adding this code, be sure to set the UntilCondition of the CAG. Run the workflow, and you ll see the message box appear four times. Add a breakpoint to the CAG and watch the code go into the WhileCondition and UntilCondition each time until the private variable is 4. Add another Code activity to the CAG and call it Code2. Generate the handlers and add a message box similar to that in Code1, except change the message to Code 2 : Private Sub Code2_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Code 2: Counter=" & IntCounter) End Sub
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CHAPTER 3 CONDITIONAL ACTIVITIES
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Run the workflow again. This time, you ll see the Code1 message box appear the first time; then the Code2 message box appears. However, the Code2 message box only appears one time. The reason for this is that there s no WhileCondition for Code2 yet. Add the following WhileCondition and set the Condition property of Code2 to this condition: Private Sub Code2WhileCondition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs) e.Result = IntCounter > 4 IntCounter = IntCounter + 1 End Sub Run the workflow again. This time, you won t see a Code2 message box, but notice that the counter is incremented by two. That s because the WhileCondition for code2 is being executed. However, the condition isn t being met (IntCounter>4), but the increment line of code is being executed. Remove the increment line from Code2WhileCondition and run again. Again, only the Code1 message boxes appear because the WhileCondition of Code2 isn t met. Change the UntilCondition to be e.result = IntCounter = 8: Private Sub UntilCondition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs) e.Result = IntCounter = 8 End Sub Run the workflow again. The Code1 message box appears the first four times; then the Code2 message box appears. This shows how you can use the CAG to create a sequence.
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