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If you ponder the current implementation of Main(), you might have realized that the time span between calling BeginInvoke() and EndInvoke() is clearly less than five 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: static void Main(string[] args) { ... BinaryOp b = new BinaryOp(Add); IAsyncResult iftAR = b.BeginInvoke(10, 10, null, null); // This call takes far less than 5 seconds! Console.WriteLine("Doing more work in Main()!"); // The calling thread is now blocked until // EndInvoke() completes. int answer = b.EndInvoke(iftAR); ... } 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 if 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 if 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: static void Main(string[] args) { ... BinaryOp b = new BinaryOp(Add); IAsyncResult iftAR = b.BeginInvoke(10, 10, null, null); // This message will keep printing until // the Add() method is finished. while(!iftAR.IsCompleted) { Console.WriteLine("Doing more work in Main()!"); }

Figure 2-1. An XHTML element node tree As you might have guessed, the reason for the quick family tree lesson is CSS s ability to piggyback on this inherent structure of (X)HTML.

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// Now we know the Add() method is complete. int answer = b.EndInvoke(iftAR); ... } Here, you enter a loop that will continue processing the Console.WriteLine() 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 WaitHandle.WaitOne() 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 (!iftAR.AsyncWaitHandle.WaitOne(2000, true)) { Console.WriteLine("Doing more work in Main()!"); } 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.

Rather than polling a delegate to determine if an asynchronously invoked 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 null. However, when you do supply an AsyncCallback object, the delegate will call the specified method automatically when the asynchronous call has completed. Like any delegate, AsyncCallback can only invoke methods that match a specific pattern, which in this case is a method taking IAsyncResult as the sole parameter and returning nothing: void MyAsyncCallbackMethod(IAsyncResult itfAR) Assume you have another application making use of the BinaryOp delegate. This time, however, you will not poll the delegate to determine if the Add() method has completed. Rather, you will define a static method named AddComplete() to receive the notification that the asynchronous invocation is finished: namespace AsyncCallbackDelegate { public delegate int BinaryOp(int x, int y); class Program { static void Main(string[] args) { Console.WriteLine("***** AsyncCallbackDelegate Example *****");

Console.WriteLine("Main() invoked on thread {0}.", Thread.CurrentThread.GetHashCode()); BinaryOp b = new BinaryOp(Add); IAsyncResult iftAR = b.BeginInvoke(10, 10, new AsyncCallback(AddComplete), null); // Other work performed here... Console.ReadLine(); } static void AddComplete(IAsyncResult itfAR) { Console.WriteLine("AddComplete() invoked on thread {0}.", Thread.CurrentThread.GetHashCode()); Console.WriteLine("Your addition is complete"); } static int Add(int x, int y) { Console.WriteLine("Add() invoked on thread {0}.", Thread.CurrentThread.GetHashCode()); Thread.Sleep(5000); return x + y; } } } Again, the static AddComplete() method will be invoked by the AsyncCallback delegate when the Add() method has completed. If you run this program, you can confirm that the secondary thread is the thread invoking the AddComplete() callback (see Figure 14-3).

Let s re-create the Employee user-defined data type that we looked at in a previous example as an object. Custom data types are a great way to store more than one related value for an item, but they have a few shortcomings. They don t do any validation, they cannot perform actions (methods or functions), and they cannot by themselves trigger events. Classes allow you to do all of these.

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