委托异步请求

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Runtime.Remoting.Messaging;
namespace LearnConsoleApp
{
    public delegate int BinaryOp(int x, int y);
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Main() invoked on thread{0}",Thread.CurrentThread.GetHashCode());
            BinaryOp b = new BinaryOp(Add);
            IAsyncResult ret = b.BeginInvoke(3, 2, new AsyncCallback(AddComplete), "Success,Success!!!!!!I'm very happy!");
            int i = 0;
            while (i<10)
            {
                i++;
                Console.WriteLine("Doing more work in Main()，Current thread is thread{0}", Thread.CurrentThread.GetHashCode());
            }
            Console.ReadLine();
        }
        static int Add(int a, int b)
        {
            Console.WriteLine("Main() invoked on thread{0}", Thread.CurrentThread.GetHashCode());
            Thread.Sleep(5000);
            return a + b;
        }
        static void AddComplete(IAsyncResult itfAr)
        {
            Console.WriteLine("AddComplete() invoked on thread {0}",Thread.CurrentThread.GetHashCode());
            Console.WriteLine("Your addition is complete.");
            BinaryOp op = (BinaryOp)((AsyncResult)itfAr).AsyncDelegate;
            int answer = op.EndInvoke(itfAr);
            Console.WriteLine("3 + 2 is {0},{1}", answer,itfAr.AsyncState.ToString());
        }
    }
}