Reminder reminder = ScheduledActionService.Find("MY REMINDER") as Reminder; if ( reminder != null ) { ScheduledActionService.Remove("MY REMINDER"); } reminder = new Reminder("MY REMINDER"); reminder.BeginTime = DateTime.Now + new TimeSpan(0, 5, 0); reminder.Content = "我的闹铃"; reminder.RecurrenceType = RecurrenceInterval.None; reminder.NavigationUri = new Uri("/ReadyPage.xaml", UriKind.Relative); ScheduledActionService.Add(reminder);