How to Schedule a Daily Task in a C# Windows Service?

Scheduling tasks in C# Windows Service

For situations where a task needs to be executed every midnight in a Windows service written in C#, it is recommended to use the task scheduler instead of relying on Thread.Sleep() and time-based checks.

An effective approach is to implement a timer in the service. The timer should fire periodically, say every 10 minutes, and verify if the date has changed since the last execution. If a new date is detected, the timer is paused while the cleanup process is performed, ensuring that it is only performed once per day.

private Timer _timer;
private DateTime _lastRun = DateTime.Now.AddDays(-1);

protected override void OnStart(string[] args)
{
    _timer = new Timer(10 * 60 * 1000); // 每10分钟
    _timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
    _timer.Start();
    //...
}

private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
    // 忽略时间，只比较日期
    if (_lastRun.Date < DateTime.Now.Date)
    {
        // 在运行清理任务时停止计时器
        _timer.Stop();
        //
        // 执行清理任务
        //
        _lastRun = DateTime.Now;
        _timer.Start();
    }
}

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