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CHAPTER 2 FIRST WORKFLOW
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Shared Sub OnWorkflowCompleted(ByVal sender As Object, ByVal e As WorkflowCompletedEventArgs) WaitHandle.Set() End Sub Shared Sub OnWorkflowTerminated(ByVal sender As Object, ByVal e As WorkflowTerminatedEventArgs) Console.WriteLine(e.Exception.Message) WaitHandle.Set() End Sub The next set of code lines creates an instance of the class WorkflowInstance. WorkflowInstance is a class within the Runtime namespace, and creates a running instance of the workflow for each new instance of this class: Dim workflowInstance As WorkflowInstance workflowInstance = workflowRuntime.CreateWorkflow(GetType(Workflow1)) Each time a user executes the workflow from the beginning, a new instance of the workflow is created, just as a new, unique instance of a class is created when the New keyword is used with a class name. This is the concept of encapsulation, which is central to object-oriented programming (OOP) and implemented here to make sure data from one instance of the workflow doesn t interfere with another instance. For example, say you have a workflow that allows an employee to request time off. Parameters that might be passed to the workflow are the date or dates requested off. If I request time off, a new workflow instance is created for me, and my requested date off is stored. If you also request time off, a new workflow instance is created for you, and your requested date off is stored. You don t want the two dates to get mixed up, or a supervisor down the line would approve a vacation request for the wrong date. After a generic workflow instance is created, a specific type of workflow is assigned to that instance by determining the type of the workflow. Finally, you start the workflow instance, and it waits: workflowInstance.Start() WaitHandle.WaitOne()
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The preceding section showed the default Module1 and workflow code in VB .NET. This section will show the same code in C#. Because only the VB .NET projects were created in 1, the C# projects need to be created now. Create a new C# Sequential workflow console application called CFirstSequentialWFConsoleApplication, and create a new C# State Machine workflow console application called CFirstStateMachineWFConsoleApplication. Open the C# Sequential workflow console application just created. Open the Solution Explorer, and you ll see the file name is different. In VB, the code file for establishing the console application was Module1.vb, but within a C# application it s called Program.cs. First, open the Workflow1.cs file view the code, which follows:
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CHAPTER 2 FIRST WORKFLOW
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using using using using using using using using using using using using
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System; System.ComponentModel; System.ComponentModel.Design; System.Collections; System.Drawing; System.Workflow.ComponentModel.Compiler; System.Workflow.ComponentModel.Serialization; System.Workflow.ComponentModel; System.Workflow.ComponentModel.Design; System.Workflow.Runtime; System.Workflow.Activities; System.Workflow.Activities.Rules;
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namespace CFirstSequentialWFConsoleApplication { public sealed partial class Workflow1: SequentialWorkflowActivity { public Workflow1() { InitializeComponent(); } } } Although the language is different, this class uses the same namespaces and classes as the VB .NET code did. Within VB .NET, namespaces and classes are used within another class by adding the Imports statement; in C# the using statement is added. Other than the syntax being different, the beginning of the Workflow1 class is also different. First, the code that s created by the designer is now shown by default, which is the same as in VB .NET, but the designer-generated code is hidden differently in C#. If you expand the designer-generated code, you ll see the InitializeComponent function and code that sets the name of the workflow. Within VB .NET, the call to InitializeComponents is in the same place, but code for InitializeComponents is separate. Open the Program.cs file and see the code is similar to that of the Module1.vb file. The objectives and order of the code is the same; obviously, the code used to accomplish each objective is different. The code for Program.cs follows: using using using using using using using System; System.Collections.Generic; System.Text; System.Threading; System.Workflow.Runtime; System.Workflow.Runtime.Hosting; CFirstSequentialWFConsoleApplication.Properties;
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