generate barcode image vb.net Part II in C#.NET

Creation UPCA in C#.NET Part II

Part II
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Working with Activities
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4. Visual Studio then automatically brings up the code editor. Locate the SayHello method Visual Studio just added, and within that method place the following code:
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// Output text to the console. Console.WriteLine("Hello from Workflow1!");
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5. We now need to add a second workflow to execute, so repeat step 2 but substitute the name Workflow2 for the name of the project. Repeat steps 3 and 4, but replace the message Hello from Workflow1! to Hello from Workflow2! Rename the workflow source file from workflow1.cs to workflow2.cs to avoid confusing the workflows later. 6. We want the first workflow to invoke the second one, but to do that, we need to add a reference to the second workflow. Before we can do that, we need to build Workflow1. Pressing F6 or selecting Build Solution from Visual Studio s Build menu builds everything. 7. Returning to the Visual Studio Solution Explorer, select the Workflow1 project and add a project-level reference to the Workflow2 project. 8. Return to the workflow graphical designer for Workflow1, and open the Toolbox again. This time, however, drag an instance of the InvokeWorkflow activity onto your sequential workflow s design surface.
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9. Looking at the properties for this new activity, we see there is a TargetWorkflow property we need to set. Click the TargetWorkflow property once to activate it, and then click its browse ( ) button (the button with the three dots).
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8
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Calling External Methods and Workflows
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10. This activates the Browse And Select A .NET Type dialog box. Select Workflow2 in the left pane, which displays the Workflow2 type in the right pane. Select the Workflow1 type (Workflow2.Workflow1 is the fully qualified name) in the right pane and click OK.
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11. Visual Studio then examines the Workflow2 workflow and displays its graphical representation inside the InvokeWorkflow activity in the visual workflow designer.
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12. The workflow implementations are now complete, so we can add them as references to the main WorkflowInvoker application. From Solution Explorer, right-click the WorkflowInvoker project and select Add Reference. When the Add Reference dialog box appears, click the Projects tab. Select both Workflow1 and Workflow 2 from the list and click OK.
Part II
Working with Activities
13. Next add the code to create and start the instance. Locate this line of code in Program.cs:
Console.WriteLine("Waiting for workflow completion.");
14. Add this code following the line of code you just located:
// Create the workflow instance. WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(Workflow1.Workflow1)); // Start the workflow instance. instance.Start();
15. We ll now add a small amount of code to the host application simply to tell us when each workflow completes. Insert the following code in the event handler for WorkflowCompleted:
if (e.WorkflowDefinition is Workflow1.Workflow1) Console.WriteLine("Workflow 1 completed."); else Console.WriteLine("Workflow 2 completed."); waitHandle.Set();
The first workflow to complete sets the AutoResetEvent we re using to force the application to wait for workflow completion. We could add code to force the application to wait for both workflows, but for demonstration purposes this should suffice. If you compile and execute the WorkflowInvoker application, you ll see console output similar to what you see in Figure 8-4. If the output messages appear in a slightly different order, don t be alarmed. This is the nature of multithreaded programming...
Figure 8-4
The WorkflowInvoker application console output
If you want to continue to the next chapter, keep Visual Studio 2005 running and turn to 9, Logic Flow Activities. It s one thing to crunch numbers, but we also need tools to make decisions, and that s the next topic. If you want to stop, exit Visual Studio 2005 now, save your spot in the book, and watch your favorite movie on DVD. Be sure to fast-forward through any boring parts.
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