create 2d barcode c# Part I in C#

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Part I
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Introducing Windows Workflow Foundation (WF)
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4. Next, find this line of code a bit further down:
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WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(LongRunningWorkflow.Workflow1));
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5. Change this line of code to match the following:
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WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(LongRunningWorkflow.Workflow1), parms);
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With that last step, we re done adding code. Compile the application by selecting Build Solution from the Visual Studio Build menu, and execute it by pressing the F5 key. Did it work It should have, because we added code to account for the situation where no command line was provided. If you were to execute the application as we did in 1 (in the Executing your workflow application section), by adding different delay values on the command line you would see the delay s effects reflected in the time lag between instances of the message boxes.
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Determining Workflow Instance Status
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Interestingly, if you look at the methods and properties of both the workflow runtime object and the workflow instance object, you don t find a status property. How do you know if there is a workflow executing, and if there is one, where is that workflow in its process Is it idled Is it executing How do we know I m jumping ahead a little, but this is the most logical place to discuss workflow status determination. As it happens, the workflow definition of a given workflow instance provides you with the execution status. The base class Activity exposes an ExecutionStatus property that sports a member of the ActivityExecutionStatus enumeration. I ve listed the ActivityExecutionStatus values with their meaning in Table 3-3.
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Table 3-3 Property Canceling Closed Compensating Executing Faulting Initialized
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ActivityExecutionStatus Values
Purpose The Activity is in the process of canceling. The Activity is closed. A transaction has failed, causing the compensation action to be initiated. (We ll learn more about this in 15.) The Activity is currently running. The Activity has sustained an exception. The Activity has been initialized but is not yet running.
The enumerated values in Table 3-3 all refer to an activity object, but remember that the workflow definition is an activity. That means if we query the workflow definition for its status, we re effectively determining the status of the entire instance. The following process shows how we add the code we need to query the workflow definition.
3
Workflow Instances
Determining workflow instance execution status 1. In the Visual Studio Solution Explorer pane, open the WorkflowHost project s Program.cs file for editing. 2. With Program.cs open in the code editor, look for the code we added in Main to start the workflow instance:
instance.Start();
3. So that we can see the workflow instance status, we ll print the result of the workflow definition status query directly to the console. Place the following below the code we inserted in Step 2:
Console.WriteLine("The workflow is: {0}", instance.GetWorkflowDefinition().ExecutionStatus.ToString());
Tip You could do more with this status information than merely print it to the console window. If you wanted to take specific action depending on the status of the workflow instance, simply add a conditional branch (such as if/else) and perform whatever action your application requires.
Terminating a Workflow Instance
Should you need to do so, you can easily terminate a workflow instance by executing the Terminate method on the WorkflowInstance object. The string you pass into Terminate is folded into an exception. If you added the WorkflowTerminated handler to your application, you can pull the reason for the termination from the Message property of the exception. You ll find the exception wrapped in the WorkflowTerminatedEventArgs that are passed into your WorkflowTerminated event handler. This code is already in WorkflowHost, so let s give it a try. We ll need to add a single line of code to actually terminate the instance. Terminating a workflow instance 1. If the WorkflowHost project s Program.cs file isn t still open in Visual Studio, open it again for editing. 2. Within Program.cs, look for the code we just added in Main to display the workflow instance execution status:
Console.WriteLine("The workflow is: {0}", instance.GetWorkflowDefinition().ExecutionStatus.ToString());
3. Following this line of code, add this new line:
instance.Terminate("User cancellation");
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