需要在.Net 4.0才会有Task

当然，既然接触到了Task，或许以后就不再用线程了，具体看情况了，之前几个线程之间就发生了阻塞问题，这次就是要解决这个问题才下这个功夫的，否则宁可被差遣抱儿子尿尿去。

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
 
using System.Threading.Tasks;  
using System.Threading;  
 
namespace TaskDemo  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            Thread mTH = new Thread(RunTask);  
            mTH.Start();  
 
            //Thread mTH1 = new Thread(RunThread);  
            //mTH1.Start();  
        }  
 
        private static void RunThread()  
        {  
            for (int i = 0; i < 20; i++)  
            {  
                Thread.Sleep(2);  
                Console.WriteLine("RunThread{0}", i);  
            }  
        }  
 
        private static void RunTask()  
        {  
            try 
            {  
                int mCount = 0;  
 
                CancellationTokenSource tokenSource = new CancellationTokenSource();  
                CancellationToken token = tokenSource.Token;  
 
                Task t = new Task(() =>  
                {  
                    Console.WriteLine("进入任务……");  
                    Thread.Sleep(10);  
                    Console.WriteLine("任务开始工作……");  
                    //模拟工作过程     
                    for (int i = 0; i < 20; i++)  
                    {  
                        if (token.IsCancellationRequested == true)  
                        {  
                            break;          //这里别人是用一个throw new OperationCanceledException(token); 但是我用就会报错  
                        }  
                        mCount++;  
                        Console.WriteLine("RunTask{0}", i);  
                        Thread.Sleep(1);  
                    }  
                }, token);  
                token.Register(() =>  
               {  
                   Console.WriteLine("Canceled");  
 
               });  
                t.Start();  
                Console.WriteLine("这条语句先运行完毕了……");  
                t.ContinueWith((task) =>  
                {  
                    Console.WriteLine("任务完成，完成时候的状态为：");  
                    Console.WriteLine("IsCanceled={0}\tIsCompleted={1}\tIsFaulted={2}\tmCount={3}", task.IsCanceled, task.IsCompleted, task.IsFaulted, mCount);  
                });  
                Console.WriteLine("现在就按任意键的话，程序就退出了……");  
 
                RunThread();        //线程内部较耗时的测试  
 
                Console.ReadKey();      //由于两个sleep都有点时间，如果在这时间之前按下任意键，结果是程序提前终止了  
                tokenSource.Cancel();  
                Console.ReadKey();      //程序退出  
 
            }  
            catch (Exception Ex)  
            {  
                Console.WriteLine(Ex.Message);  
            }  
        }  
 
    }  
}