为地图出现的异常事件提供数据。
Inheritance: System.EventArgs
 protected void OnMapMapLayerError(MapErrorEventArgs e)
 {
     if (MapLayerError != null)
     {
         MapLayerError(this, e);
     }
 }
 private static void MapLayerPropertyChanged(object sender, DependencyPropertyChangedEventArgs e)
 {
     if (e.NewValue != null)
     {
         MapControl map = (MapControl)sender;
         SuperMapProvider provider = null;
         try
         {
             if (e.NewValue is MapByScalesLayer)
             {
                 MapByScalesLayer temp = e.NewValue as MapByScalesLayer;
                 provider = new SuperMapProvider(temp.ServiceUrl, temp.MapName, temp.Scales);
             }
             else if (e.NewValue is MapByZoomCountLayer)
             {
                 MapByZoomCountLayer temp = e.NewValue as MapByZoomCountLayer;
                 provider = new SuperMapProvider(temp.ServiceUrl, temp.MapName, temp.ZoomCount, temp.DefaultScaleIndex);
             }
         }
         catch (Exception ex)
         {
             MapErrorEventArgs mapEx = new MapErrorEventArgs("初始化地图图层时发生异常", ex);
             map.OnMapMapLayerError(mapEx);
             return;
         }
         map._bounds = new Rectangle2D(
                 provider.Projection.Bounds.Left,
                 provider.Projection.Bounds.Bottom,
                 provider.Projection.Bounds.Right,
                 provider.Projection.Bounds.Top);
         map.gMapControl1.MapProvider = provider;
         map.gMapControl1.MaxZoom = provider.MapScales.Length - 1;
         map.gMapControl1.MinZoom = 0;
         map.gMapControl1.Zoom = 0;
         map.Center = provider.DefaultMapCenter;
         map._scales = provider.MapScales;
         map.OnPropertyChanged(e);
     }
 }
 void Map_MapLayerError(object sender, MapErrorEventArgs e)
 {
     _sync.Post(ShowMessage, "地图图层异常");
 }