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);