Question

Im试图利用C#进行缩编,并用格式显示时间:

hour:minutes:seconds

我试图这样做:

 var minutes = 3; //countdown time
  var start = DateTime.Now;
  var end = DateTime.Now.AddMinutes(minutes);
  Thread.Sleep(1800);
  if (??) // I tried DateTime.Now > end not works
  {
       //... show time
      label1.Text = "..."; 
  } 
  else 
  {
     //done 
      label1.Text = "Done!"; 
  }

解决这一问题的方法也不尽相同。预收

Answer 1

您不应在此使用<条码>。 Thread.Sleep on the UI thread Band the UI, and using it on another thread causes to increase details due to read coordinatedation.

如果你有C# 5或CTP,那么你或许可以写出与你所写的非常相似的代码,因为你可以继续使用相当于<条码>的编号。

In standard C# 4 I d use a System.Windows.Forms.Timer.

To start the countdown:

var minutes = 3; //countdown time
var start = DateTime.UtcNow; // Use UtcNow instead of Now
endTime = start.AddMinutes(minutes); //endTime is a member, not a local variable
timer1.Enabled = true;

在时间手里,你写:

TimeSpan remainingTime=endTime-DateTime.UtcNow;
if(remainingTime<TimeSpan.Zero)
{
   label1.Text = "Done!";
   timer1.Enabled=false; 
}
else
{
  label1.Text = remainingTime.ToString();
}

其他格式选择见。 Standard TimeSpan Format Strings。

该法典还有一个问题,即如果系统锁定变化,它不会正确发挥作用。

使用<代码> 现在,,而不是Datetime.UtcNow,在从/到日光储蓄或改变时间区时,也会中断。由于你想要确定某个时间点(而不是一个显示时间),你应当使用UTC而不是当地时间。

Answer 2

我会利用这样的时间。首先是两种情况变数。

private int _countDown = 30; // Seconds
private Timer _timer;

和在施工或装货活动中

_timer = new Timer();
_timer.Tick += new EventHandler(timer_Tick);
_timer.Interval = 1000;
_timer.Start();

接着是活动手稿

void timer_Tick(object sender, EventArgs e)
{
    _countDown--;
    if (_countDown < 1)
    {
        _countDown = 30;
    }
    lblCountDown.Text = _countDown.ToString();
}

Answer 3

You could also use a Timer, as this would handle all the problems like UI-locking. You can use the System.Windows.Forms.Timer-Timer. In the MSDN library you can find samples of the use of it.

WinForms-timer还负责全时和全时地援引。

- SeriTools

Answer 4

Your code sets up the variables then goes to sleep for 3 minutes so the if-statement isn t executed until it leaves the sleep state. Either set up a new thread to update the UI or do something like this...

while (DateTime.now < end) {
  label1.Text = "...";
  Thread.Sleep(#); //Pick a second, or 5 or whatever
}

label1.Text = "Done!";

有了两条read子,在你的工作过程中,你仍然能够 st。 “Done>一经结束即出现。

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