BeginInvoke,EndInvoke 비동기 호출 의뢰 의 실현 코드 기반

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); 
            //      
            Func<long, long> delegateMethod = new Func<long, long>(CalcSum); 
            //      ,         asyncState     ，             EndInvoke      
            delegateMethod.BeginInvoke(200, DoneCallback, delegateMethod); 
            //      ,     
            delegateMethod.BeginInvoke(10000000000, DoneCallback, delegateMethod); 
            Console.ReadLine(); 
        } 

        //       
        static void DoneCallback(IAsyncResult asyncResult) 
        { 
            //                  
            Console.WriteLine("DoneCallback ThreadId = " + Thread.CurrentThread.ManagedThreadId); 

            Func<long, long> method = (Func<long, long>)asyncResult.AsyncState; 
            //         EndInvoke     
            try { 
                //  BeginInvoke      EndInvoke      ，            ，             
                long sum = method.EndInvoke(asyncResult); 
                Console.WriteLine("sum = {0}",sum); 
            } 
            catch (OverflowException) 
            { 
                Console.WriteLine("     "); 
            } 
        } 

        //     
        static long CalcSum(long topLimit) 
        { 
            //              
            Console.WriteLine("Calc ThreadId = " + Thread.CurrentThread.ManagedThreadId); 
            checked
            { 
                long result = 0; 
                for (long i = 0; i < topLimit; i++) 
                { 
                    result += i; 
                } 
                return result; 
            } 
        } 
    } 

}