using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
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, null, null);
while (!iftAR.AsyncWaitHandle.WaitOne(2000, true)) {
Console.WriteLine("Doing more work in Main()!");
}
int answer = b.EndInvoke(iftAR);
Console.WriteLine("10 + 10 is {0}.", answer);
}
static int Add(int x, int y) {
Console.WriteLine("Add() invoked on thread {0}.", Thread.CurrentThread.GetHashCode());
Thread.Sleep(5000);
return x + y;
}
}
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