路由事件（鼠标路由事件+键盘路由事件）

1：常规的鼠标路由事件定义：

        #region 路由事件
        public static readonly RoutedEvent CrossIconClickedEvent = EventManager.RegisterRoutedEvent("CrossIconClicked",
            RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(FilterLabel));
        #endregion

       #region CLR事件
        public event RoutedEventHandler CrossIconClicked
        {
            add { this.AddHandler(CrossIconClickedEvent, value); }
            remove { this.RemoveHandler(CrossIconClickedEvent, value); }
        }
        #endregion

#region 私有方法
        /// <summary>
        /// 点击删除图标，引发CrossIconClicked事件
        /// </summary>
        private void ImageDel_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            //引发路由事件
            RoutedEventArgs newEvent = new RoutedEventArgs(FilterLabel.CrossIconClickedEvent, this);
            this.RaiseEvent(newEvent);
        }
        #endregion

2：键盘路由事件定义

 #region 路由事件
        public static readonly RoutedEvent FreeKeyDownEvent = EventManager.RegisterRoutedEvent("FreeKeyDown",
            RoutingStrategy.Bubble, typeof(KeyEventHandler), typeof(FreeDatePicker));
        #endregion

#region CLR事件
        //
        // 摘要:
        //     在焦点位于此元素上并且用户按下键时发生。
        public event KeyEventHandler FreeKeyDown
        {
            add { this.AddHandler(FreeKeyDownEvent, value); }
            remove { this.RemoveHandler(FreeKeyDownEvent, value); }
        }
        #endregion

/// <summary>
        /// 触发FreeKeyDown事件(非鼠标的键盘路由事件）
        /// </summary>
        private void Date_TextBox_KeyDown(object sender, KeyEventArgs e)
        {
            KeyEventArgs newEvent = new KeyEventArgs(e.KeyboardDevice, e.InputSource, e.Timestamp, e.Key);
            newEvent.RoutedEvent = FreeDatePicker.FreeKeyDownEvent;
            this.RaiseEvent(newEvent);
        }