使用BeginInvoke,EndInvoke非同步呼叫委託

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);            //給委託賦值            Func<long, long> delegateMethod = new Func<long, long>(CalcSum);            //非同步執行委託,這裡把委託本身作為asyncState對象傳進去，在回呼函數中需要使用委託的EndInvoke來獲得結果            delegateMethod.BeginInvoke(200, DoneCallback, delegateMethod);            //非同步執行委託,拋出異常            delegateMethod.BeginInvoke(10000000000, DoneCallback, delegateMethod);            Console.ReadLine();        }        //委託回呼函數        static void DoneCallback(IAsyncResult asyncResult)        {            //到這兒委託已經在非同步線程中執行完畢            Console.WriteLine("DoneCallback ThreadId = " + Thread.CurrentThread.ManagedThreadId);            Func<long, long> method = (Func<long, long>)asyncResult.AsyncState;            //委託執行的異常會在EndInvoke時拋出來            try {                //使用BeginInvoke時傳入委託的EndInvoke獲得計算結果，這時候計算結果已經出來了，有異常的話也在這兒拋出來                long sum = method.EndInvoke(asyncResult);                Console.WriteLine("sum = {0}",sum);            }            catch (OverflowException)            {                Console.WriteLine("運算溢出了");            }        }        //委託方法        static long CalcSum(long topLimit)        {            //委託在另一個線程中開始執行            Console.WriteLine("Calc ThreadId = " + Thread.CurrentThread.ManagedThreadId);            checked            {                long result = 0;                for (long i = 0; i < topLimit; i++)                {                    result += i;                }                return result;            }        }    }}