倒数计时器的顺序相反 [英] Countdown timer in reverse order

问题描述

我创建了一个倒数计时器，其代码如下：

Hi,

I've created a countdown timer whose code looks like:

protected void Timer1_Tick(object sender, EventArgs e)
    {
        try
        {
            dt1 = dt1.AddSeconds(1);
Label4.Text = (TimeSpan.FromHours(2D) - TimeSpan.FromSeconds(dt1.Second)).ToString("hh\\:mm\\:ss");
}
}

但上述代码仅工作1分钟。以相反的顺序然后重复继续。是否有可能以相反的顺序创建计时器半小时。



请提供片段



非常感谢提前



我尝试过：



我尝试上面的代码，输出如01：59：59,01：59：58等等。

But the above code worked for only 1 min. in reverse order then repetition goes on again. Can it be possible to create timer in reverse order for 1/2 hours.

Please provide the snippet

Thanks a lot in advance

What I have tried:

The above code I tried and the output comes like 01:59:59, 01:59:58 and so on.

推荐答案

而不是使用DateTime和更改它，当你启动计时器时占用当前时间，并设置目标时间：

Instead of using a DateTime and changing it, take the current time when you start teh timer, and set a target time:

private DateTime target;
...
target = DateTime.Now.AddMinutes(30);
Timer1.Start();

然后，在您的Tick处理程序中，检查区别：

Then, in your Tick handler, check the difference:

void Timer1_Tick(object sender, EventArgs e)
    {
    TimeSpan diff = target - DateTime.Now;
    if (diff.TotalSeconds <= 0)
        {
        myTextBox.Text = "Done!";
        Timer1.Stop();
        }
    else
        {
        myTextBox.Text = ((int) diff.TotalSeconds).ToString();
        }
    }

这样，它几乎可以用于任何偏移，并且更准确。

That way, it will work with almost any offset, and be a lot more accurate.

这篇关于倒数计时器的顺序相反的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！