取消本地通知

有人用它来取消先前计划的本地通知吗?我在文档中看到它，但无法在代码中连接它。

UIApplication.SharedApplication.ScheduledLocalNotifications schedNoteList = new 
                 UIApplication.SharedApplication.ScheduledLocalNotifications();
        foreach(UILocalNotification sNote in schedNoteList)
        {
            if(sNote.FireDate == oldDate)
            {
                //Cancel the Notification
                UIApplication.CancelLocalNotification(sNote);
            }
        }

谢谢,瑞克

    foreach(UILocalNotification sNote in UIApplication.SharedApplication.ScheduledLocalNotifications)
    {
        if(sNote.FireDate == DateTime.Now)
        {
            //Cancel the Notification'
            UIApplication.SharedApplication.CancelLocalNotification (sNote);
        }
    }