定时器不能在 C# 中停止 [英] Timer cannot be stopped in C#

问题描述

我在 Windows 窗体(C# 3.0、.net 3.5 SP1、VS2008 SP1、Vista)上有一个计时器，即使在它停止后似乎也能工作.代码是:

I have a timer on a windows form (C# 3.0, .net 3.5 SP1, VS2008 SP1, Vista) that seems to work even after it is stoppped. The code is:

using System;
using System.Windows.Forms;

namespace TestTimer
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            StartTimer();
        }

        private DateTime deadline;

        private void StartTimer()
        {
            deadline = DateTime.Now.AddSeconds(4);
            timer1.Start();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            int secondsRemaining = (deadline - DateTime.Now).Seconds;

            if (secondsRemaining <= 0)
            {
                timer1.Stop();
                timer1.Enabled = false;
                MessageBox.Show("too slow...");
            }
            else
            {
                label1.Text = "Remaining: " + secondsRemaining.ToString() + (secondsRemaining > 1 ? " seconds" : " second");
            }
        }
    }
}

即使在 timer1.Stop() 被调用之后，我仍然在屏幕上接收到 MessageBoxes.当我按 esc 时，它会停止.然而，我预计只会出现一个消息框......我还应该做什么?添加 timer1.Enabled = false 不会改变行为.

Even after the timer1.Stop() is called, I keep reeciving MessageBoxes on the screen. When I press esc, it stops. Howevere, I've expected that only one message box appears... What else should I do? adding timer1.Enabled = false does not change the behavior.

谢谢

推荐答案

我可能错了，但是 MessageBox.Show() 是阻塞操作(等待您关闭对话框)吗?如果是这样，只需将 Show() 调用移动到停止/启用行之后?

I could be wrong, but is MessageBox.Show() a blocking operation (that waits for you to dismiss the dialog)? If so, just move the Show() call to after the Stop/Enabled lines?

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