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
     
       delegateMethod = new Func
      
       (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
       
         method = (Func
        
         )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;            }        }    }}