如何显示从特定时间减去的剩余时间？ [英] How to display remaining time that subtracted from a specific time?

问题描述

我想显示铃声系统的剩余时间。

当我们处于上午8:00到8:45的第一个时段时，我想在第一个时段结束时显示剩余时间。如上所述，当我们处于上午8:50 - 9:35的第二个时期时，我想展示同样的东西。



我用的是一个显示剩余分钟和秒的计时器。以下是我到目前为止：

I want to display the remaining time from periods for the bell system.
When we are in the first period which is 8:00 to 8:45 am, I want to display remaining time to the end of the first period. So like above, when we are in the second period which is 8:50 - 9:35am, I want to display the samething.

What I used was a timer to display remaining minutes and seconds. Here is what I have so far:

private void timerPeriods_Tick(object sender, EventArgs e)
       {

           DateTime endTime= new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Hour, 8, 45, 0);

           TimeSpan timeRemaining = TimeSpan.FromTicks(DateTime.Now.Subtract(endTime).Ticks);

           lblStatus.Text = startTime.ToString();

       }

然而我无法让它发挥作用。有更好的方法吗？

However I couldn't make it work. Is there a better way to do it?

推荐答案

在应用程序开始时执行此操作。您需要通过计时器刻度事件处理程序访问 startTimes 。

Do this at the start of your app. startTimes will need to be accessible by your timer tick event handler.

// Compute start times
List<datetime> startTimes = new List<datetime>();
DateTime startTime = DateTime.Today.AddHours (8);
int periodLengthMins = 45;
int breakLengthMins = 5;
for (int i=0; (i < 10); i++) {
     startTimes.Add (startTime);
     startTime = startTime.AddMinutes (periodLengthMins + breakLengthMins);
}

在您的计时器刻度处理程序中执行此操作：

Do this in your timer tick handler:

// Determine time to start of next period
DateTime now = DateTime.Now;
DateTime? nextPeriod = startTimes.FirstOrDefault (p => (p - now).Ticks >= 0);
lblStatus.Text = nextPeriod.HasValue ?
                 (nextPeriod - now).ToString() : "No next period";

/ ravi

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