c# generate data matrix INTERACTING WITH WORKFLOW in Visual C#.NET

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CHAPTER 7 INTERACTING WITH WORKFLOW
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End If End Sub Private Sub ApproveReview(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Handles Me.ReviewApproved MsgBox("Reviewer: " & StrReviewer & " has approved the review for " & StrReviewee) End Sub Private Sub DoNotApproveReview(ByVal sender As Object, ByVal e As ExternalDataEventArgs) Handles Me.ReviewNotApproved MsgBox("Reviewer: " & StrReviewer & " has not approved the review for " & StrReviewee) End Sub End Class Add a breakpoint to the MsgBox line in the preceding code (within the CreateReview function). Execute the workflow. When the breakpoint is encountered, press F11 through the message box. Press F11 again and the threadpool code executes. Press F11 again, and instead of entering the AskForApproval sub, the Return True code is executed and control goes out of the CreateReview function. If you continue instead of pressing F11, the message box asking for approval appears for a brief second, if at all. The reason is the workflow has executed the activity and has moved on. There s no next activity within the workflow, so the workflow terminates. This is the reason for adding a Listen activity. Return to the Workflow Designer. Add a Listen activity from the Toolbox to the designer, after the callCreateReview activity. The Listen activity waits for an external event to occur. The Listen activity, like some other activities, is a composite activity. It s made up of at least one HandleExternalEvent activity. Change the name of the Listen activity to ReviewResponse. Add a HandleExternalEvent activity to the left side of the Listen activity. Change the Name property to HandleReviewApproval. Click the ellipse next to the InterfaceType property and choose IReview from the type selection window. Then, choose ReviewApproved from the EventName property drop-down. Figure 7-5 shows the completed HandleReviewApproval property page.
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Figure 7-5. HandleReviewApproval properties
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CHAPTER 7 INTERACTING WITH WORKFLOW
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Add another HandleExternalEvent activity and change the Name property to HandleReviewNotApproved. Click the ellipse next to the InterfaceType property and choose IReview from the type selection window. Choose ReviewNotApproved from the EventName property. Now view the code for the workflow and add two new subs to be called when each event is triggered: Private Sub OnApproved(ByVal sender As Object, ByVal e As ExternalDataEventArgs) MsgBox("Approved") End Sub Private Sub OnNotApproved(ByVal sender As Object, ByVal e As ExternalDataEventArgs) MsgBox("Not Approved") End Sub View the Workflow Designer again and the properties for the HandleReviewApproved activity. Add OnApproved to the Invoked property. When this event is invoked, the OnApproved sub will be called. Do the same with the HandleReviewNotApproved activity and the OnNotApproved sub. Execute the workflow, and when prompted, say Yes, you want to approve. You ll then get a message box of Approved.
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Events in C#
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The previous section explained how to accommodate events by listening and then handling them in VB. This section will show how to accomplish the same work in C#. Be sure the following using statements are present in ReviewService.cs: using System.Workflow.Runtime; using System.Windows.Forms; using System.Threading; The first step is to define an event or events within the interface for the service class. Open the ReviewService.cs class file and add the following two lines to the Interface declaration: event EventHandler<ExternalDataEventArgs> ReviewApproved; event EventHandler<ExternalDataEventArgs> ReviewNotApproved; These two lines define two event handlers that use a parameter of type ExternalDataEventArgs. The completed interface code follows: [ExternalDataExchange] interface IReview { Boolean CreateReview(String Reviewer, String Reviewee); event EventHandler<ExternalDataEventArgs > ReviewApproved; event EventHandler<ExternalDataEventArgs > ReviewNotApproved; }
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CHAPTER 7 INTERACTING WITH WORKFLOW
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Next, you must define the events within the ReviewService class. Before the CreateReview sub, add the following two lines: public event EventHandler<ExternalDataEventArgs> ReviewApproved; public event EventHandler<ExternalDataEventArgs> ReviewNotApproved; These two lines define an event within the class, and define which event within the interface each class-defined event will implement. Instead of two subs created to handle the events, a new class is defined that s passed back in the event handle. It s of type ExternalDataEventArgs. Add the following code to the beginning of the class file, after the namespace declaration: [Serializable] internal class ReviewEventArgs : ExternalDataEventArgs { private string alias; public ReviewEventArgs(Guid InstanceID, string alias) : base(InstanceID) { this.alias = alias; } public string Alias { get { return this.alias; } set { this.alias = value; } } } After you ve defined the events, you must declare the two variables. Add two declarations at the beginning of the class, one (before the event declaration) for StrReviewer and one for StrReviewee. Define both as a string. Next, assign the correct parameter to each value within the CreateReview function. The beginning of the class is as follows: class ReviewService:IReview { static String StrReviewer; static String StrReviewee; public event EventHandler<ExternalDataEventArgs > ReviewApproved; public event EventHandler<ExternalDataEventArgs > ReviewNotApproved; public Boolean CreateReview(String Reviewer, String Reviewee) { StrReviewer = Reviewer; StrReviewee = Reviewee; MessageBox.Show("Reviewer: " + Reviewer); return true; } Next, you need to add a sub to ask the user if he or she approves or not, and you need to raise the correct event (either ReviewApproved or ReviewNotApproved). To do this, add the following code:
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