C#中forms.timer跟while循环是不是又冲突啊，计时器没反应呢

Question

 private void form1_Click(object sender, EventArgs e)
        {
            Timer RQ_Time = new Timer();
            RQ_Time.Interval = 10000;
            RQ_Time.Tick += new EventHandler(RQ_Time_Tick);
            RQ_Time.Start();
            while(!exitFlag)
{
   if(a==true)
   {
       dosomething;
    }
    thread.sleep(200);
}
}

Answer 1

 timer1.Enabled = true;

Answer 2

System.Windows.Forms.Timer是基于消息的。你进入tick事件就阻塞了当前的消息循环，
try
private void form1_Click(object sender, EventArgs e)
{
Timer RQ_Time = new Timer();
RQ_Time.Interval = 10000;
RQ_Time.Tick += new EventHandler(RQ_Time_Tick);
RQ_Time.Start();
while(!exitFlag)
{
Application.DoEvents();
if(a==true)
{
dosomething;
}
thread.sleep(200);
Application.DoEvents();
}
}

Answer 3

 timer1.Enabled = true;