code to generate barcode in vb.net The Workflow Runtime in C#

Create UPC-A Supplement 5 in C# The Workflow Runtime

2
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The Workflow Runtime
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Creating a basic console application 1. Start Visual Studio 2005 as you did in the previous chapter. 2. From the File menu, select New and then Project. 3. When the New Project dialog box appears, expand the Visual C# tree control node and then select Windows from the Project Types pane. 4. Select Console Application from the Templates pane. 5. In the Name field, type WorkflowHost. 6. In the Location field, type \Workflow\2. Note Remember that the path \Workflow represents the path you are using to store the book s sample applications. 7. Click OK to create the WorkflowHost project. At this point, we have a basic console application, but of course it does nothing interesting. Now let s begin adding workflow components. Speaking personally, I truly love the Visual Studio IntelliSense functionality. But for that to take effect, you have to first reference the assemblies IntelliSense will interpret to help you write code. So a great place to start is to reference the workflow assemblies before adding any code. This way, when we do add code, we can take advantage of the Visual Studio code assistance capabilities. Adding the workflow assembly references 1. In the Visual Studio Solution Explorer pane, right-click the References tree node and select Add Reference.
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result.
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Selecting Add Reference from the Visual Studio Project menu achieves the same
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Introducing Windows Workflow Foundation (WF)
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2. This activates the Add Reference dialog box. Using the vertical scrollbar s thumb control, scroll down until you find System.Workflow.Runtime. Select that using a single mouse click.
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3. Click OK to add the reference. Visual Studio has now added the workflow runtime reference you ll need to execute workflow tasks. What we ve not done is actually bring the workflow runtime into execution. To do that, we need to add some code to our application here s what we ll do. Hosting the workflow runtime 1. If it s not already open, open the Program.cs file for editing as you did in the previous chapter. 2. Locate the following code (which is located at the top of the source file):
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using System; using System.Collections.Generic; using System.Text;
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3. Add the following line of code, just after the System.Text line:
using System.Workflow.Runtime;
4. Locate the Main method, and add the following line of code after the opening curly brace:
WorkflowRuntime workflowRuntime = new WorkflowRuntime();
5. For now, we ll just compile the program to make sure there are no errors. We ll use this application throughout the chapter, so keep Visual Studio running, or reload this application as necessary while progressing through the chapter. To compile, select Build WorkflowHost from the Visual Studio Build menu.
2
The Workflow Runtime
A Closer Look at the WorkflowRuntime Object
Now that we have an instance of WorkflowRuntime created in our WorkflowHost application, it s time to take a brief look at how we interact with this object. Like most useful objects, WorkflowRuntime exposes a set of methods and properties we use to control the workflow runtime environment. Table 2-1 lists all the WorkflowRuntime properties, while Table 2-2 lists the methods we typically use.
Table 2-1 Property IsStarted
WorkflowRuntime Properties
Purpose Used to determine whether the workflow runtime has been started and is ready to accept workflow instances. IsStarted is false until the host calls StartRuntime. It remains true until the host calls StopRuntime. Note you cannot add core services to the workflow runtime while it is running. (We ll address starting services in 5.) Gets or sets the name associated with the WorkflowRuntime. You cannot set Name while the workflow runtime is running (that is, when IsStarted is true). Any attempt to do so will result in an InvalidOperationException.
Name
Table 2-2 Method
WorkflowRuntime Methods
Purpose Adds the specified service to the workflow runtime. There are limitations regarding what services can be added as well as when. We ll look at services in more detail starting in 5. Creates a workflow instance, including any specified (but optional) parameters. If the workflow runtime has not been started, the CreateWorkflow method calls StartRuntime. Retrieves the workflow instance that has the specified workflow instance identifier (which consists of a Guid). If the workflow instance was idled and persisted, it will be reloaded and executed. Starts the workflow runtime and the workflow runtime services and then raises the Started event. Stops the workflow runtime and the runtime services and then raises the Stopped event.
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