Trigger BackgroundWorker at a specific point in time-CodePudding

I try to create a windows service to check my data has expired.

protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
    while (!stoppingToken.IsCancellationRequested)
    {
        TimeSpan now = DateTime.Now.TimeOfDay;
        if (now.Hours == 14 & now.Minutes == 37 & now.Seconds == 0)
        {
            //do something...
        }
    }
}

I found this BackgroundWorker always check the current time.

Is this the correct way to use it?

CodePudding user response：

This loop will run continuously. If you want to run the background worker at a specific point in time then you can either make the thread sleep for the specific amount of time (Target time - current time) or a fixed interval before it polls for the execution window. Keep in mind that when you choose the latter you should allow the execution happen within a window than the exact time. Otherwise, the task may never execute!

CodePudding user response：

Thanks to Mayur Ekbote for giving me ideas.

Here is my solution:

while (!stoppingToken.IsCancellationRequested)
{
    DateTime now = DateTime.Now;
    DateTime work_point = new DateTime(now.Year, now.Month, now.Day, 18, 33, 00);
    if (work_point < now)
    {
        work_point = work_point   new TimeSpan(24,0,0);
    }
    DateTime start_check_point = work_point - new TimeSpan(0, 1, 0);
    DateTime end_check_point = work_point   new TimeSpan(0, 1, 0);
    if (now >= start_check_point && now <= end_check_point)
    {
        _logger.LogInformation("start program at {time}", DateTimeOffset.Now);
        try
        {
            //do something...
        }
        catch (Exception ex)
        {
            _logger.LogError("error msg", ex.Message);
        }
        finally
        {
            //Skip inspection period interval
            await Task.Delay(1000 * 60, stoppingToken);
        }
    }
    else
    {
        _logger.LogError($"Scheduled to run at {work_point.ToString("s")} ");
         //Pause the program until the check interval to avoid wasting performance
        await Task.Delay(start_check_point - now, stoppingToken);
    }
}