如何使计时器火在经常性地 [英] How to make timer fire in a recurring manner

问题描述

我有我要过期的每次周一下午5点定时器。当测试应用程序，一旦它到达下午5点在周一，我的任务被触发，因为它应该。

I have a timer which I want to expire every Monday at 5pm. When testing the application, as soon as it reaches 5pm on a Monday, my task is fired as it is supposed to.

不过，当我改变系统日期和时间，在接下来的一周下午5时，任务不火。这是我的code：

However, when I change the system date and time to the following week at 5pm, the task does not fire. This is my code:

Timer timer = new Timer(callback, application, timeToEnd, TimeSpan.FromDays(7));

我有一种感觉，它有事可做与 TimeSpan.FromDays（7）部分。任何想法？

推荐答案

您现在的麻烦是。我们要求的框架后， x天，y小时，Z分来通知您。因此，定时器将火完全后，什么时候你告诉它。

You're now in trouble. We asked the framework to notify you after x days, y hours, z minutes. So timer will fire exactly after what time you told it to.

我知道这是不正确的路要走，但是这会工作。

I know this is not the right way to go, but this will work.

SystemEvents.TimeChanged += SystemEvents_TimeChanged;

static void SystemEvents_TimeChanged(object sender, EventArgs e)
{
    timer.Dispose();//Dispose your previous timer
    SetTimerAgain();//Call the method which sets the timer again. you're done
}

我推荐Windows计划任务，但由于某些原因，你不能因此这里是要走的路。

I recommend "Windows Scheduled Tasks", but for some reason you can't so here is the way to go.

你也可以运行一个周期性的定时器作为@giammin建议。

Also you could run a periodic timer as @giammin suggested.

TimerCallback callback = (state) =>
{      
    var now = DateTime.Now; 
    if(now.DayOfWeek == DayOfWeek.Monday 
     && now.TimeOfDay.Hours == 17 && now.TimeOfDay.Minutes == 0)
    {
        MyMethod();
    }
};

Timer timer = new Timer(callback, application, 0, 10000);//10seconds

通过后一种方式，则应该从一次次调用该方法在同一天为自己辩护。

With the latter approach you should defend yourself from calling the method again and again for the same day.

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