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Workflow Tracking
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5. Click once on the left branch, ifElseBranchActivity1, to activate its properties in the Visual Studio Properties window. 6. Look for ifElseBranchActivity1 s Condition property. Open the drop-down list by clicking the down arrow, and select Code Condition.
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7. The Condition property should now display a plus sign (+) to its left. Click the plus sign to expand the property grid and expose the Condition property s Condition name field. (It may seem confusing to have a property of a property use a name that is identical to its parent, but that s how the WF team chose to name things.) In the edit control, type QueryDelay. We ll use this method to decide which path we ll take through the IfElse activity.
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Part I
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Introducing Windows Workflow Foundation (WF)
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8. Next we ll add some activities to the left branch (which is the branch that is executed when the condition evaluates to true). First, drag a Code activity from the Toolbox and drop it onto the left IfElse branch, ifElseBranchActivity1.
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9. The exclamation mark (!) you see in the preceding figure means we have work to do. In this case, it indicates we need to to add a method to be called when the code activity we just placed into our workflow is executed. In the Visual Studio Properties pane, locate the ExecuteCode property and type PreDelayMessage into its edit control.
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10. You probably see what I m doing... I m essentially adding the delay workflow we created in 3 to this workflow. And as we did in 3, drop a Delay activity and
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Workflow Tracking
another Code activity into ifElseBranchActivity1 and set their properties. The Delay activity should delay 10 seconds (00:00:10), as in 3, and the second Code activity should execute a method called PostDelayMessage. When completed, the designer should look like the following:
11. With our designer work complete, let s add some code. Click the View Code toolbar button in the Visual Studio Solution Explorer toolbar to bring up the C# code for Workflow1.cs. Begin by adding a reference to System.Windows.Forms as well as the corresponding using statement at the top of the Workflow1.cs file.
using System.Windows.Forms;
12. As you scan through the file, you should see the three event handlers Visual Studio added for you as activity properties: PreDelayMessage, PostDelayMessage, and QueryDelay. As you did in 3, add message boxes to the Code activity methods so that the application notifies you when the workflow is executing. To PreDelayMessage, add this code:
MessageBox.Show("Pre-delay code is being executed."); To PostDelayMessage, add this code: MessageBox.Show("Post-delay code is being executed.");
13. The slightly more interesting case is the code we ll add to QueryDelay:
e.Result = false; // assume we'll not delay... if (MessageBox.Show("Okay to execute delay in workflow processing ", "Query Delay", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) { // Allow progression e.Result = true; // Show message
Part I
Introducing Windows Workflow Foundation (WF)
Console.WriteLine("Delay path taken..."); } // if else { // Show message Console.WriteLine("Delay path NOT taken..."); } // else
14. With the workflow complete, we ll need to add a reference from our main application, WorkflowTracker, to the workflow, TrackedWorkflow. A project-level reference is easiest, and to add the reference right-click the References folder in the WorkflowTracker project in Visual Studio s Solution Explorer and select Add Reference. When the Add Reference dialog box appears, select the Project tab and then click the TrackedWorkflow project from the list. Click OK. 15. Open Program.cs in the WorkflowTracker project for editing and then look for this line of code:
Console.WriteLine("Waiting for workflow completion.");
16. To create a workflow instance, add this code following the line of code you just located:
// Create the workflow instance. WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(TrackedWorkflow.Workflow1)); // Start the workflow instance. instance.Start();
17. Compile the solution by pressing F6. Correct any compilation errors. 18. To execute the application, press F5 (or Ctrl+F5) and respond Yes to the delay query. You should see this console output:
We now have a basic workflow we can use to experiment with WF s tracking capabilities. Let s turn now to adding the code we ll need to actually perform the tracking.
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