Delegating a task in and getting notified when it completes (in C#)

Question

Conceptually, I would like to accomplish the following but have had trouble understand how to code it properly in C#:

SomeMethod { // Member of AClass{}
            


        

Answer 1

You have to use AsyncCallBacks. You can use AsyncCallBacks to specify a delegate to a method, and then specify CallBack Methods that get called once the execution of the target method completes.

Here is a small Example, run and see it for yourself.

class Program {

    public delegate void AsyncMethodCaller();


    public static void WorkerMethod()
    {
        Console.WriteLine("I am the first method that is called.");
        Thread.Sleep(5000);
        Console.WriteLine("Exiting from WorkerMethod.");
    }

    public static void SomeOtherMethod(IAsyncResult result)
    {
        Console.WriteLine("I am called after the Worker Method completes.");
    }



    static void Main(string[] args)
    {
        AsyncMethodCaller asyncCaller = new AsyncMethodCaller(WorkerMethod);
        AsyncCallback callBack = new AsyncCallback(SomeOtherMethod);
        IAsyncResult result = asyncCaller.BeginInvoke(callBack, null);
        Console.WriteLine("Worker method has been called.");
        Console.WriteLine("Waiting for all invocations to complete.");
        Console.Read();

    }
}