c# generate data matrix Workflow Messaging in Visual C#.NET

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WF implements a messaging event system between workflows and the runtime host. The communication is defined by an interface, and is implemented in a service class that s added to the runtime. WF uses two ways to handle events. The first is DoSomething/SomethingDone using a local service. Using this means of interaction requires a method invoked on a local service and an event raised back to provide feedback on the success or failure of the workflow. Using this scenario, the local service begins a thread that performs the necessary work. That thread raises the event to indicate completion. The second means of interaction is a generic inbound event scenario. This scenario can be used most often with State Machine workflows. The reason is that this type of scenario is best for cases where you don t know the length of time needed to do the work. For example, if a supervisor receives an employee performance review to examine and approve, the review might wait with the supervisor for an extended period of time before the supervisor acts on the review.
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Create a new VB Sequential Workflow Console Application called VBCommunicationSequentialConsoleApplication. Open Module1.vb and add the following lines to the top of the code page: Imports System.Threading Imports System.Workflow.Runtime Imports System.Workflow.Activities
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CHAPTER 7 INTERACTING WITH WORKFLOW
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Add a new, empty class to the project called ReviewService.vb. This is the local service that will act as the intermediary between the workflow and a Windows form. The first step is to define the interface and to add the ExternalDataExchange attribute to the interface. That way, the workflow knows this interface defines the communication between the class and the workflow. To do this, add the following code above the Public Class declaration (at the top of the code page): <ExternalDataExchange()> _ Public Interface IReview Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean End Interface This code defines the interface called IReview with a function called CreateReview. The workflow uses this interface to create an initial performance review, and accepts two parameters: Reviewer and Reviewee. The interface is now defined, but there s no code associated with the interface. To do this, change the public class declaration for ReviewService to the following: Public Class ReviewService: Implements IReview When you do this, a function definition for CreateReview will automatically be created. If the definition isn t automatically created, use the following code to define the sub: Public Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean Implements IReview.CreateReview Within this definition, notice the parameters are listed as they were in the interface and at the end of the definition line as Implements IReview.CreateReview. This code shows that this function is going to implement the function CreateReview that was defined within the interface. For a simple example, add the following code to the CreateReview function: Msgbox("Reviewer: " & Reviewer) Return True The ReviewService.vb file should now contain the following code: <ExternalDataExchange()> _ Public Interface IReview Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean Event ReviewApproved() Event ReviewNotApproved() End Interface Public Class ReviewService : Implements IReview Public Function CreateReview(ByVal Reviewer As String, ByVal Reviewee As String) As Boolean Implements IReview.CreateReview MsgBox("Reviewer: " & StrReviewer) Return True End Function End Class
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CHAPTER 7 INTERACTING WITH WORKFLOW
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Now that the you ve defined the service class, you can define the workflow. The activity that calls methods outside the workflow is the CallExternalMethod activity. This activity is used to call methods defined within an interface of type ExternalDataExchange. This is the reason for the first line of the IReview interface declaration <ExternalDataExchange>. This is an attribute that defines the interface as being of type ExternalDataExchange. Add a CallExternalMethod activity to Workflow1 using the designer. Change the name to CallCreateReview. The properties for the CallExternalMethod are shown in Figure 7-1.
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Figure 7-1. CallCreateReview properties Click the ellipse next to the InterfaceType property for this activity. The type selection dialog box appears, as shown in Figure 7-2. Notice the statement Showing interfaces marked with an ExternalDataExchangeAttribute. Only the interfaces that were defined with the ExternalDataExchange attribute are shown in this list. If you didn t add the attribute to the beginning of the interface declaration, you won t see a type listed. If you did add the attribute, you ll see IReview as the only interface defined within the current project in this list. Select IReview, as shown in Figure 7-3, and click OK.
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