How Can I Schedule a C# Windows Service to Run a Daily Task Reliably?

C# Windows Service Daily Task Scheduling

To make C# Windows services perform tasks on a daily basis, there are multiple methods to choose from. It is not recommended to use the Thread.Sleep() method. A better approach is to use a scheduled task or implement a timer in the service.

For custom solutions, timers can be set in the service. This timer should fire at fixed intervals (e.g. every 10 minutes). When triggered, the code can check if the date has changed since the last time it was run. If so, you can stop the timer while performing the cleanup task. Once the task is completed, the timer can be restarted.

The following code snippet demonstrates this approach:

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)
    {
        _timer.Stop();
        // 执行每日清理任务
        _lastRun = DateTime.Now;
        _timer.Start();
    }
}

This setting will ensure that cleanup tasks are performed reliably at midnight every day without using Thread.Sleep().

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