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If you take a moment to ponder the current implementation of Main(), you might have realized that the time span between calling BeginInvoke() and EndInvoke() is clearly less than 5 seconds. Therefore, once "Doing more work in Main()!" prints to the console, the calling thread is now blocked and waiting for the secondary thread to complete before being able to obtain the result of the Add() method. Therefore, you are effectively making yet another synchronous call (in a very roundabout fashion!): Sub Main() ... Dim b As BinaryOp = New BinaryOp(Add) Dim itfAR As IAsyncResult = b.BeginInvoke(10, 10, Nothing, Nothing) ' This call takes far less than 5 seconds! Console.WriteLine("Doing more work in Main()!") ' The calling thread is now blocked until ' EndInvoke() completes. Dim answer As Integer = b.EndInvoke(itfAR) ... End Sub Obviously, asynchronous delegates would lose their appeal if the calling thread had the potential of being blocked under various circumstances. To allow the calling thread to discover whether the asynchronously invoked method has completed its work, the IAsyncResult interface provides the IsCompleted property.

Using this member, the calling thread is able to determine whether the asynchronous call has indeed completed before calling EndInvoke() If the method has not completed, IsCompleted returns False, and the calling thread is free to carry on its work If IsCompleted returns True, the calling thread is able to obtain the result in the least blocking manner possible Ponder the following update to the Main() method: Sub Main() .. Dim b As BinaryOp = New BinaryOp(Add) Dim itfAR As IAsyncResult = bBeginInvoke(10, 10, Nothing, Nothing) ' This message will keep printing until ' the Add() method is finished While Not itfARIsCompleted ConsoleWriteLine("Doing more work in Main()!") ' Just so we don't see hundreds of printouts! ThreadSleep(1000) End While ' Now we know the Add() method is complete Dim answer As Integer = bEndInvoke(itfAR) ...

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You can use the IContractBehavior interface to modify the dispatch behavior on the client or service level. IContractBehavior is an extension point you usually need only when you want to influence the dispatch behavior of WCF (see Listing 3-17).

End Sub Here, you enter a loop that will continue processing the ConsoleWriteLine() statement until the secondary thread has completed Once this has occurred, you can obtain the result of the Add() method knowing full well the method has indeed completed In addition to the IsCompleted property, the IAsyncResult interface provides the AsyncWaitHandle property for more flexible waiting logic This property returns an instance of the WaitHandle type, which exposes a method named WaitOne() The benefit of WaitHandleWaitOne() is that you can specify the maximum wait time If the specified amount of time is exceeded, WaitOne() returns False Ponder the following updated while loop: While Not itfARAsyncWaitHandleWaitOne(2000, true) ConsoleWriteLine("Doing more work in Main()!") ' Just so we don't see dozens of printouts! Thread.

ever filled out a web form in Mobile Safari, you may have noticed the extra translucent black toolbar that runs across the top of the keyboard, as shown in Figure 3 12. As with a custom keyboard, this is accomplished by creating a view that contains the additional interface elements you want displayed above the keyboard. Whereas a keyboard replacement uses inputView, your input accessory view should be assigned to the inputAccessoryView property instead.

Sleep(1000) End While While these properties of IAsyncResult do provide a way to synchronize the calling thread, they are not the most efficient approach In many ways, the IsCompleted property is much like a really annoying manager (or classmate) who is constantly asking, Are you done yet Thankfully, delegates provide a number of additional (and more effective) techniques to obtain the result of a method that has been called asynchronously..

Listing 3-17. IContractBehavior Interface public interface IContractBehavior { void AddBindingParameters(ContractDescription description, ServiceEndpoint endpoint, BindingParameterCollection parameters); void ApplyClientBehavior(ContractDescription description, ServiceEndpoint endpoint, ClientRuntime proxy); void ApplyDispatchBehavior(ContractDescription description, IEnumerable<ServiceEndpoint> endpoints, DispatchRuntime dispatch); void Validate(ContractDescription description, ServiceEndpoint endpoint); } When you implement the IContractBehavior interface in your client-side proxy or service, the ApplyClientBehavior and ApplyDispatchBehavior methods will be called when WCF is binding the proxies or dispatchers. Obviously, you can then influence the passed-in parameters. This is an extension point of the Service runtime.

Rather than polling a delegate to determine whether an asynchronous method has completed, it would be ideal to have the delegate inform the calling thread when the task is finished. When you wish to enable this behavior, you will need to supply an instance of the System.AsyncCallback delegate as a parameter to BeginInvoke(), which up until this point has been Nothing. However, when you do supply an AsyncCallback object, the delegate will call the specified method automatically when the asynchronous call has completed.

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