C#:如何在滴答中间停止计时器

Question

我在 form1(windows 窗体)中设置了一个定时器，每秒滴答一次

private void Form1_Load(object sender, EventArgs e)
    {
      Timer.Interval = 1000;
      Timer.Start;
    }

在 timer.tick 事件中，我将其设置为在一定数量的滴答后停止。

 private void Timer_Tick(object sender, EventArgs e)
   {
     if(x == 0)
        {
           MessageBox.Show("ETC");
           Timer.Stop();
        }
  }

但是，我发现 timer.Stop() 并没有结束计时器，即使在 x = 0 之后，消息框仍然每秒弹出一次。这是为什么？我该如何停止计时器？

这是完整的代码

 private void btnStart_Click(object sender, EventArgs e)
    {
        checkTiming.Stop();

        try
        {
            timeTick.hour = int.Parse(textBoxHour.Text);
            timeTick.min = int.Parse(textBoxMin.Text);
            timeTick.sec = int.Parse(textBoxSec.Text);
            numRepeat = int.Parse(textBoxRepeat.Text);
            timeTick.totalTime = 0;
            current = timeTick.hour * 3600 + timeTick.min * 60 + timeTick.sec;

            if (timeTick.hour * 3600 + timeTick.min * 60 + timeTick.sec > 0 && timeTick.min <= 60 && timeTick.sec <=60 )
            {

            memory.listHistory.Add(memory.padMultipleString(textBoxHour.Text, textBoxMin.Text, textBoxSec.Text));
            updateListViewHistory(memory.listHistory);

            checkTiming.Interval = 1000;
            checkTiming.Start();      
            }

            else 
            {
                MessageBox.Show("Please enter a valid value", "Error", MessageBoxButtons.OK);
                initialise();
            }
        }

        catch
        {
            MessageBox.Show("Please enter positive integers to all textBoxes", "Error", MessageBoxButtons.OK);
            initialise();
        }
    }

这里是滴答事件

 private void checkTiming_Tick(object sender, EventArgs e)
   {

       timeTick.updateTime(current);
       updateTextBoxes();

       if(current > 0)
       {
           current--;
       }

       if(current == 0)
       {
          if(numRepeat > 1)
          {
              numRepeat--;
              current = timeTick.totalTime;
              //Console.WriteLine(current);

              MessageBox.Show(memory.listHistory.Last() + " has elapsed. " + "Repeating " + numRepeat.ToString() + " more times", "Timing has Ended", MessageBoxButtons.OK);
          }

           if(numRepeat == 1)
           {
               MessageBox.Show(memory.listHistory.Last() + " has elapsed", "Timing has Ended", MessageBoxButtons.OK);
               timeTick.totalTime = 0;
               Console.WriteLine(numRepeat);
               checkTiming.Stop();
           }
       }



   }

主要问题出在这部分

       private void checkTiming_Tick(object sender, EventArgs e)
   {

       timeTick.updateTime(current);
       updateTextBoxes();

       if(current > 0)
       {
           current--;
       }

       if(current == 0)
       {
          if(numRepeat > 1)
          {
              numRepeat--;
              current = timeTick.totalTime;
              //Console.WriteLine(current);

              MessageBox.Show(memory.listHistory.Last() + " has elapsed. " + "Repeating " + numRepeat.ToString() + " more times", "Timing has Ended", MessageBoxButtons.OK);
          }

           if(numRepeat == 1)
           {
               MessageBox.Show(memory.listHistory.Last() + " has elapsed", "Timing has Ended", MessageBoxButtons.OK);
               timeTick.totalTime = 0;
               Console.WriteLine(numRepeat);
               checkTiming.Stop();
           }
       }

即使当 numRepeat 为 1 且 current = 0 时，即使我声明它(checkTiming.Stop())，计时器也不会停止

Answer 1

根据documentation , 消息框:

Displays a message window, also known as a dialog box, which presents a message to the user. It is a modal window, blocking other actions in the application until the user closes it.

这意味着当控件到达 MessageBox.Show 行时，它将停在那里，直到用户关闭消息框。这意味着在用户关闭消息框之前不会调用 Timer.Stop。这就是计时器仍会滴答作响的原因。

要解决这个问题，只需更改方法调用的顺序:

   checkTiming.Stop();
   MessageBox.Show(memory.listHistory.Last() + " has elapsed", "Timing has Ended", MessageBoxButtons.OK);
   timeTick.totalTime = 0;
   Console.WriteLine(numRepeat);