arcgis禁用双击放大地图 Silverlight

MyMap.MouseLeftButtonDown += new MouseButtonEventHandler(MyMap_MouseLeftButtonDown);
  void MyMap_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (nMouseType > 0)
            {
                if (this._mouseTool.IsDoubleClick())
                {
                    e.Handled = true; //取消双击时间
                }
            }
        }

<pre name="code" class="csharp">//禁止滚轮缩放，原理是固定地图比例为1

if (isInit) //是否启用缩放            {                MyMap.ZoomFactor = 10;            }            else            {                MyMap.ZoomFactor = 1;            }

  private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {

            MyMap.MouseLeftButtonDown += new MouseButtonEventHandler(MyMap_MouseLeftButtonDown);  //添加注册事件，因为在地图上按下右键后，设置<span style="font-family: Arial, Helvetica, sans-serif;">MyMap.IsEnabled = false;会把地图所有事件都取消，所以需要把右键UP事件绑定在添加的新层</span><span style="font-family: Arial, Helvetica, sans-serif;">spHideLayer上</span><span style="font-family: Arial, Helvetica, sans-serif;">
</span>

            MyMap.MouseRightButtonDown += new MouseButtonEventHandler(MyMap_MouseRightButtonDown);
            MyMap.MouseRightButtonUp += new MouseButtonEventHandler(MyMap_MouseRightButtonUp);
            spHideLayer.MouseRightButtonUp += new MouseButtonEventHandler(MyMap_MouseRightButtonUp);
        
       
            LayoutRoot.MouseRightButtonDown += (obj, arg) =>  //禁用右键
            {
                arg.Handled = true;
            };
            LayoutRoot.MouseLeftButtonDown += (obj, arg) =>
            {
                spRightMouse.Visibility = System.Windows.Visibility.Collapsed;
            };
          
        }


        void MyMap_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (nMouseType > 0)
            {
                MyMap.IsEnabled = false; //取消地图所有事件
                spHideLayer.Visibility = System.Windows.Visibility.Visible; //显示事件绑定的透明层
                spHideLayer.MouseWheel += new MouseWheelEventHandler(spHideLayer_MouseWheel); //注册滚轮事件
            }
        }
        void MyMap_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
        {
            MyMap.IsEnabled = true;
            spHideLayer.Visibility = System.Windows.Visibility.Collapsed;
            spHideLayer.MouseWheel -= new MouseWheelEventHandler(spHideLayer_MouseWheel);
        }
        void spHideLayer_MouseWheel(object sender, MouseWheelEventArgs args)
        {
            if (args.Delta > 0)
            {


            }
            else
            {
               
            }
        }