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CHAPTER 3 CONDITIONAL ACTIVITIES
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IfElse Activity Within State Machine Workflow
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To begin this new project, create a new VB State Machine Workflow Console Application called VBIfElseStateMachineExample. As was done in 2, change the name of the state that s first displayed in the designer to CompletedState and set it as the Completed State. Next, view the code for the workflow and add a private variable called IntInputValue and a public writeonly property called InputValue, as was done in the Sequential workflow example: Private IntInputValue As Integer Public WriteOnly Property InputValue() As Integer Set(ByVal value As Integer) IntInputValue = value End Set End Property You re going to be adding an IfElse activity to this workflow, so create the Branch1Condition and Branch2Condition subs the same way as was done for the Sequential workflow, using the same criteria statements: Private Sub Branch1Condition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs) e.Result = IntInputValue > 50 End Sub Private Sub Branch2Condition(ByVal sender As System.Object, ByVal e As ConditionalEventArgs) e.Result = IntInputValue > 25 End Sub Add another State activity with a name of FirstState, and set it as the initial state. You ll also need to add two other State activities, one of which will be executed for each different branch. Add a State activity called Branch1State and another called Branch2State. Within the FirstState activity that was just added, drag a StateInitialization activity and leave the name as the default. Double-click the activity to drill down and be able to add other activities to it. Add an IfElse activity and view the properties of the left branch. Change the name to Branch1 and choose CodeCondition as the condition again. This time, because you already added the Branch1Condition and Branch2Condition subs, you ll see them in the second Condition drop-down. Choose the Branch1Condition for Branch1. Perform the same steps on the right branch with a name of Branch2 and Branch2Condition. Now the IfElse activities are all set up to evaluate which branch to follow. The next step is to tell each branch what to do when it s evaluated as True. Add a SetState activity to each branch with a name of SetStateBranch1 and SetStateBranch2, and change the TargetState to the appropriate state, either Branch1State or Branch2State. The composite FirstState activity should look like Figure 3-3.
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Figure 3-3. FirstState activity Next, you need to add activities to the Branch1State and Branch2State activities. These states will be executed when the appropriate branch is executed within the just-completed FirstState activity. Within the Branch1State activity, add an EventDriven activity with a name of Branch1EventActivity. Within this activity, add a Delay activity called Branch1Delay that only delays for five seconds. After the Delay activity, add a Code activity with a name of Branch1Code. Generate the handlers for this Code activity and add a message box that states Branch1. Finally, add a SetState activity called Branch1SetState with a target state of CompletedState. This SetState activity will move control to the CompletedState (the last state in the workflow) when executed. The Branch1State should look like Figure 3-4. Repeat the same process for Branch2State. The remaining code in the Workflow.vb file is as follows: Private Sub Branch1Code_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Branch1") End Sub Private Sub Branch2Code_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Branch2") End Sub The completed workflow should look like Figure 3-5.
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Figure 3-4. Branch1State activity
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Figure 3-5. VBIfElseStateMachine workflow The final step is to add the parameter code to the Module1.vb file so the user can interact with the console application and enter a value. Use the same code that was used for the Sequential workflow. Sub Main within Module1.vb will look like the following code:
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CHAPTER 3 CONDITIONAL ACTIVITIES
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Shared Sub Main() Dim workflowRuntime As New WorkflowRuntime() AddHandler workflowRuntime.WorkflowCompleted, AddressOf OnWorkflowCompleted AddHandler workflowRuntime.WorkflowTerminated, AddressOf OnWorkflowTerminated Dim workflowInstance As WorkflowInstance Dim parms As Dictionary(Of String, Object) = New Dictionary(Of String, Object) Console.WriteLine("Input value: ") parms.Add("InputValue", CInt(Console.ReadLine())) workflowInstance = workflowRuntime.CreateWorkflow(GetType(Workflow1), parms) workflowInstance.Start() WaitHandle.WaitOne() End Sub As with the Sequential workflow, add a breakpoint to the FirstState state activity and debug the workflow. The first time through, enter 45 as the input value. Notice the sequence of activities. Branch2 within the IfElse activity is executed, which sets the state to Branch2State. The Branch2State is executed, which first delays five seconds, then provides a message box with Branch2 in it. Finally, the state is set to CompletedState and the workflow ends. As with the sequential example, debug the workflow again and enter 10 as the value. When you do this, notice that none of the branches are executed and the workflow never completes. This is the difference between Sequential and State Machine workflows. The Sequential workflow continues to the next step if neither of the branches evaluates to True. However, a State Machine workflow needs a SetState activity to be executed to move from state to state. Because neither branch within the IfElse activity was executed, neither SetState activity was executed. To fix this situation, right-click the IfElse activity and choose Add Branch. This adds a branch to the right of Branch2. Call this Branch3; there s no condition for this branch. This branch is the Else part of the If Else statement. This branch is executed if none of the other branches evaluate to True. Within Branch3, add a SetState activity called SetStateBranch3, with a target state of CompletedState. When this branch is executed, because the others evaluated to False, the workflow state will be set to the CompletedState and the workflow will end. To test this, debug again and enter 10 again, and you ll see that the workflow moves to Branch3 and then to the CompletedState. Remember this example anytime you want to use an IfElse activity within a State Machine workflow. There must be a branch that s executed, no matter what the value is. There are no significant code changes between the Sequential workflow and the State Machine workflow in these two examples, so I m not going to show the C# code for the IfElse activity within a State Machine workflow.
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