Task状态

      Task task=null;
        private void button1_Click(object sender, EventArgs e)
        {
            task = Task.Factory.StartNew(() =>
              {
                  while (true)
                  {
                      //Thread.Sleep(10000);
                      //break;
                      throw new Exception("1232");
                  }
              });
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            if (task == null)
            {
                textBox1.Text = "还未实例化";
            }
            else
            {
                textBox1.Text = task.Status.ToString();
            }
            //    public enum TaskStatus
            //{
            //    Created,
            //    WaitingForActivation,
            //    WaitingToRun,
            //    Running,
            //    WaitingForChildrenToComplete,
            //    RanToCompletion,
            //    Canceled,
            //    Faulted
            //}
            //执行完成就是RanToCompletion
            //有异常报错就是Faulted
            //正在运行就是Running
        }
　　　　//如果一个Task在运行，强制task=null了，那么这个线程还是在后台运行l