复制代码 代码如下:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

namespace ConsoleApplication1

{

class Program

{

static void Main(string[] args)

{

Console.WriteLine("Main ThreadId = " + Thread.CurrentThread.ManagedThreadId);

//给委托赋值

Func<long, long> delegateMethod = new Func<long, long>(CalcSum);

//异步执行委托,这里把委托本身作为asyncState对象传进去，在回调函数中需要使用委托的EndInvoke来获得结果

delegateMethod.BeginInvoke(200, DoneCallback, delegateMethod);

//异步执行委托,抛出异常

delegateMethod.BeginInvoke(10000000000, DoneCallback, delegateMethod);

Console.ReadLine();

}

//委托回调函数

static void DoneCallback(IAsyncResult asyncResult)

{

//到这儿委托已经在异步线程中执行完毕

Console.WriteLine("DoneCallback ThreadId = " + Thread.CurrentThread.ManagedThreadId);

Func<long, long> method = (Func<long, long>)asyncResult.AsyncState;

//委托执行的异常会在EndInvoke时抛出来

try {

//使用BeginInvoke时传入委托的EndInvoke获得计算结果，这时候计算结果已经出来了，有异常的话也在这儿抛出来

long sum = method.EndInvoke(asyncResult);

Console.WriteLine("sum = {0}",sum);

}

catch (OverflowException)

{

Console.WriteLine("运算溢出了");

}

}

//委托方法

static long CalcSum(long topLimit)

{

//委托在另一个线程中开始执行

Console.WriteLine("Calc ThreadId = " + Thread.CurrentThread.ManagedThreadId);

checked

{

long result = 0;

for (long i = 0; i < topLimit; i++)

{

result += i;

}

return result;

}

}

}

}