protected void RunBackgourndRunner(Func<DateTime> now,DateTime? alarmTime ) { if (alarmTime.HasValue) { var cancelToken = new CancellationTokenSource(); var task = new Task(() => { while (!cancelToken.IsCancellationRequested) { if (now.AreEquals(alarmTime.Value)) { //闹铃时间到了 ItIsTimeToAlarm(); cancelToken.Cancel(); } cancelToken.Token.WaitHandle.WaitOne(TimeSpan.FromSeconds(2)); } }, cancelToken.Token, TaskCreationOptions.LongRunning); task.Start(); } }