是否有可以注册的SystemEvent,并且会在午夜更新日期时发布?
答案 0 :(得分:11)
这是我用来处理这个问题的课程。它类似于@sll的答案,但考虑到系统时间的变化,也会触发每个午夜,而不是仅触发一次。
static class MidnightNotifier
{
private static readonly Timer timer;
static MidnightNotifier()
{
timer = new Timer(GetSleepTime());
timer.Elapsed += (s, e) =>
{
OnDayChanged();
timer.Interval = GetSleepTime();
};
timer.Start();
SystemEvents.TimeChanged += OnSystemTimeChanged;
}
private static double GetSleepTime()
{
var midnightTonight = DateTime.Today.AddDays(1);
var differenceInMilliseconds = (midnightTonight - DateTime.Now).TotalMilliseconds;
return differenceInMilliseconds;
}
private static void OnDayChanged()
{
var handler = DayChanged;
if (handler != null)
handler(null, null);
}
private static void OnSystemTimeChanged(object sender, EventArgs e)
{
timer.Interval = GetSleepTime();
}
public static event EventHandler<EventArgs> DayChanged;
}
由于它是静态类,您可以使用以下代码订阅事件:
MidnightNotifier.DayChanged += (s, e) => { Console.WriteLine("It's midnight!"); };
答案 1 :(得分:2)
Windows任务计划程序通常是在指定日期启动某些内容的正确方法。
但如果你真的在寻找一个或同等的事件:
var timer = new System.Timers.Timer((DateTime.Today.AddDays(1) – DateTime.Now).
TotalMillisecond);
timer.Elapsed += new ElapsedEventHandler(OnMidnight);
timer.Start();