Csharp/CSharp Tutorial/Development/Async Delegate

Async Callback Delegate

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Runtime.Remoting.Messaging;
public delegate int BinaryOp(int x, int y);
class Program {
    static void Main(string[] args) {
        BinaryOp b = new BinaryOp(Add);
        IAsyncResult iftAR = b.BeginInvoke(10, 10, new AsyncCallback(AddComplete), "Main() thanks you for adding these numbers.");
        Console.ReadLine();
    }
    static void AddComplete(IAsyncResult itfAR) {
        AsyncResult ar = (AsyncResult)itfAR;
        BinaryOp b = (BinaryOp)ar.AsyncDelegate;
        Console.WriteLine("10 + 10 is {0}.", b.EndInvoke(itfAR));
        string msg = (string)itfAR.AsyncState;
        Console.WriteLine(msg);
    }
    static int Add(int x, int y) {
        Console.WriteLine("Add() invoked on thread {0}.", Thread.CurrentThread.GetHashCode());
        Thread.Sleep(5000);
        return x + y;
    }
}