arcgis for silverlight 鼠标点击地图获取当前经纬度

silverlight代码：

地图的name值是myMap。后台在页面初始化的时候，添加地图的点击事件

myMap.MouseClick+=new EventHandler<Map.MouseEventArgs>(myMap_MouseClick);

 #region /////////////////////////////////////////////////地图事件 和 坐标
        private void myMap_MouseClick(object sender, Map.MouseEventArgs e)
        {
            //MapPoint p = e.MapPoint;//当前获取到的点,坐标系是墨卡托的
            ESRI.ArcGIS.Client.Projection.WebMercator _mercator = new ESRI.ArcGIS.Client.Projection.WebMercator();//墨卡托类

            MapPoint mapPoint = _mercator.ToGeographic(e.MapPoint) as MapPoint;
            txtCoord.Text = mapPoint.X + "," + mapPoint.Y;
            //MessageBox.Show("经度:"+mapPoint.X+"纬度:"+mapPoint.Y);
            
        }
        //复制坐标按钮事件
        private void btnCopy_Click(object sender, RoutedEventArgs e)
        {
            string coord = txtCoord.Text.Trim();
            //HtmlPage.Window.Invoke("Copy", coord);
            Clipboard.SetText(coord);
            MessageBox.Show("复制成功");
        }
        #endregion