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)
{
Console.WriteLine("Main() invoked on thread {0}.",Thread.CurrentThread.ManagedThreadId);
BinaryOp b = new BinaryOp(Add);
IAsyncResult iftAR = b.BeginInvoke(10, 10,new AsyncCallback(AddComplete),"adding these numbers.");
Console.ReadLine();
}
static void AddComplete(IAsyncResult itfAR)
{
Console.WriteLine("AddComplete() invoked on thread {0}.",Thread.CurrentThread.ManagedThreadId);
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.ManagedThreadId);
Thread.Sleep(5000);
return x + y;
}
}