非UI的子线程再启动线程的话，等待的时候会被阻塞，Task不会阻塞了

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);              }          }       }  }