基于使用BeginInvoke,EndInvoke異步調(diào)用委托的實現(xiàn)代碼

更新時間：2013年05月18日 11:52:31 作者：

本篇文章是對使用BeginInvoke,EndInvoke異步調(diào)用委托的實現(xiàn)代碼進(jìn)行了分析介紹，需要的朋友參考下

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); 
            //給委托賦值 
            Func<long, long> delegateMethod = new Func<long, long>(CalcSum); 
            //異步執(zhí)行委托,這里把委托本身作為asyncState對象傳進(jìn)去，在回調(diào)函數(shù)中需要使用委托的EndInvoke來獲得結(jié)果 
            delegateMethod.BeginInvoke(200, DoneCallback, delegateMethod); 
            //異步執(zhí)行委托,拋出異常 
            delegateMethod.BeginInvoke(10000000000, DoneCallback, delegateMethod); 
            Console.ReadLine(); 
        } 

        //委托回調(diào)函數(shù) 
        static void DoneCallback(IAsyncResult asyncResult) 
        { 
            //到這兒委托已經(jīng)在異步線程中執(zhí)行完畢 
            Console.WriteLine("DoneCallback ThreadId = " + Thread.CurrentThread.ManagedThreadId); 

            Func<long, long> method = (Func<long, long>)asyncResult.AsyncState; 
            //委托執(zhí)行的異常會在EndInvoke時拋出來 
            try { 
                //使用BeginInvoke時傳入委托的EndInvoke獲得計算結(jié)果，這時候計算結(jié)果已經(jīng)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"); 
            } 
        } 

        //委托方法 
        static long CalcSum(long topLimit) 
        { 
            //委托在另一個線程中開始執(zhí)行 
            Console.WriteLine("Calc ThreadId = " + Thread.CurrentThread.ManagedThreadId); 
            checked
            { 
                long result = 0; 
                for (long i = 0; i < topLimit; i++) 
                { 
                    result += i; 
                } 
                return result; 
            } 
        } 
    } 

}