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Figure 29-7. The configured While activity As soon as you specify the name of the method used to test the While condition, the IDE will generate a method stub where the second parameter is of type ConditionalEventArgs. This type contains a property named Result, which can be set to true or false based on the success or failure of the condition you are modeling. To do so, add a new string member variable named userName to your ProcessUsernameWorkflow class, and assign to it the value String.Empty. Within the scope of the GetAndValidateUserName() method, simply ask the user to enter his or her name, and if the name length is fewer than ten characters, set the Result property to true. Here are the updates in question: public sealed partial class ProcessUsernameWorkflow : SequentialWorkflowActivity { // User name field and related property. private string userName = String.Empty; public string UserName { get { return userName; } set { userName = value; } } private void GetAndValidateUserName(object sender, ConditionalEventArgs e) { Console.Write("Please enter name, which much be less than 10 chars: "); userName = Console.ReadLine(); // See if name is correct length, and set the result. e.Result = (userName.Length > 10); } ... } The final task to complete the While activity involves adding at least a single activity within the scope of the While logic. Here we will add a new Code activity named NameNotValidActivity, which has been connected to a method named NameNotValid via the ExecuteCode property. Figure 29-8 shows the final workflow diagram.

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Figure 29-8. The final WF activity The implementation of NameNotValid() is also intentionally simple: private void NameNotValid(object sender, EventArgs e) { Console.WriteLine("Sorry, try again..."); } At this point, you may compile and run this workflow-enabled application. When you execute the program, purposely enter more than ten characters a few times. You will notice that the runtime engine forces the user to reenter data until the business rule (length > 10) is honored. Figure 29-9 shows one possible output.

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While our first example executes as expected, we have yet to examine the code that actually instructs the WF engine to execute the tasks that represent the current workflow To understand this aspect of WF, open the Programcs file that was created when you defined your initial project Within the Main() method, you will find code that makes use of two core types, WorkflowRuntime and WorkflowInstance As the names suggest, the WorkflowRuntime type represents the WF runtime engine itself, while WorkflowInstance is used to represent an instance of a given (pardon the redundancy) workflow instance Here is the Main() method in question, annotated with my various code comments: static void Main(string[] args) { // Ensure the runtime shuts down when we are finished.

Explicit helps the compiler catch any variable names you may have mistyped. It also helps you avoid confusion when the scope of a variable may not be clear.

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using(WorkflowRuntime workflowRuntime = new WorkflowRuntime()) { AutoResetEvent waitHandle = new AutoResetEvent(false); // Handle events that capture when the engine completes // the workflow process and if the engine shuts down with an error workflowRuntimeWorkflowCompleted += delegate(object sender, WorkflowCompletedEventArgs e) { waitHandleSet(); }; workflowRuntimeWorkflowTerminated += delegate(object sender, WorkflowTerminatedEventArgs e) { ConsoleWriteLine(eExceptionMessage); waitHandleSet(); }; // Now, create a WF instance that represents our type WorkflowInstance instance = workflowRuntimeCreateWorkflow(typeof(UserDataWFAppProcessUsernameWorkflow)); instanceStart(); waitHandleWaitOne(); } } First of all, notice that the WorkflowCompleted and WorkflowTerminated events of WorkflowRuntime are handled using C# anonymous method syntax The WorkflowCompleted event fires when the WF engine has completed executing a workflow instance, while WorkflowTerminated fires if the engine terminates with an error.

Another frequent need is to center an entire layout horizontally within the browser window. While you might think this should work without resorting to CSS trickery, you would be wrong. Happily, the workaround is a quick and easy one (and you can use it to center other elements within your layout, not just the entire page bonus!). The only requirement is that you have a wrapper around your entire layout. For this example, we ll call our wrapper element #wrapper: <body> <div id="wrapper"> ... </div> </body> Take a few seconds to imagine all your other layout elements where the ... is in the previous code. Done OK, now on to the CSS: body { text-align:center; min-width:800px; } #wrapper { margin:0 auto; width:800px; text-align:left; } Setting text-align:center; on the body element centers the layout in IE/Win, thanks to another one of its rendering bugs, while the min-width dimension (which should match the dimension on #wrapper) corrects a strange behavior in some slightly older versions of Mozilla

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