我的代码在这里有什么问题？ [英] what is wrong here on my code?

问题描述

嗨亲爱的

我试图做一个简单的闹钟

我有一个计时器，一个日期时间选择器和一个按钮



代码在这里：

hi dears
I tried to make an simple alarm
I have a timer, a datetimepicker and a button

the code is here:

private void timer1_Tick(object sender, EventArgs e)
        {
            label3.Text = DateTime.Now.ToLongTimeString();

            DateTime dte = DateTime.Now;
            DateTime dts = dateTimePicker1.Value;
            TimeSpan ts = new TimeSpan();
            ts = dts - dte;
            int x = ts.Milliseconds;
            tsec++;
            if (tsec == x)
                MessageBox.Show("gsd");
        }

        private void button1_Click(object sender, EventArgs e)
        {

            timer1.Enabled = true;
            timer1.Interval = 1000;
            timer1.Start();
            
        }

对不起我是非常新的c＃



这里有什么问题？

谢谢

excuse me im very new on c#

what is wrong here?
thanks

推荐答案

不要这样做！

试试这个：

Don't do it like that!
Try this:

private bool waitingTimer = true;
private void timer1_Tick(object sender, EventArgs e)
    {
    DateTime now = DateTime.Now;
    label3.Text = now.ToLongTimeString();
    
    if (waitingTimer && now > dateTimePicker1.Value)
        {
        waitingTimer = false;
        MessageBox.Show("gsd");
        }
    }

您的方法存在的问题是它希望计时器一直发生，并准确到毫秒 - 但如果你没有在当前毫秒为零时启动计时器，它永远不会匹配！

The problem with your method is that it expects the timer to happen all the time, and to be accurate to the millisecond - but if you don't start the timer when the current milliseconds is zero, it will never match!

你也可以像这样重写你的代码：

You can also re-write your code like this :

private static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

private void timer1_Tick(object sender, EventArgs e)
{
   label3.Text = DateTime.Now.ToLongTimeString();

   long dte = (long) (DateTime.UtcNow - UnixEpoch).TotalMilliseconds;
   long dts = (long) (dateTimePicker1.Value - UnixEpoch).TotalMilliseconds;

    if (dte == dts)
        MessageBox.Show("gsd");

}

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