The following code shows how to execute a method asynchronously using delegates and how a call-back method is executed when it is completed. As you run the code, you can see the Add method displays the sum of two numbers and wait for 3 seconds. Only then, the method call ends and executes the code in the addCompleted method.
delegate void deleType(int x, int y);
public class Class1
{
public void Add(int i, int j)
{
Console.WriteLine(i + j);
System.Threading.Thread.Sleep(3000);
}
public void addCompleted(IAsyncResult result)
{
deleType deleInstance = (deleType) result.AsyncState;
deleInstance.EndInvoke(result);
if (result.IsCompleted == true)
Console.WriteLine("Asynchronous call completed!");
}
public static void Main()
{
Class1 c = new Class1();
deleType deleInstance = new deleType(c.Add);
AsyncCallback cbackMethod = new AsyncCallback(c.addCompleted);
IAsyncResult result = deleInstance.BeginInvoke(10, 20, cbackMethod, deleInstance);
Console.WriteLine("Press Enter to close application.");
Console.ReadLine();
}
}
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