Esri Legend - dynamically adding layers during runtime

EdwardSon — Tue, 19 Jun 2012 22:42:54 GMT

I have Esri Legend control which is bound during initialization to the Map.Layers, everything shows fine, including GroupLayers.
But during runtime, when I add new GraphicsLayers as result of searches, and I add these to the Current.Map.Layers from code behind, the Legend control doesn't seem to get updated.

I am adding layers from an asynchronous code thread, btw...

Re: Esri Legend - dynamically adding layers during runtime

JenniferNery — Sat, 11 Dec 2021 19:12:45 GMT

Is Legend.LayerIDs property set? If yes, this needs to include the new layer ID's. If not, does your new GraphicsLayer have a renderer?

You can try the following code:

 <Grid x:Name="LayoutRoot">
  <esri:Map x:Name="MyMap" WrapAround="True">
   <esri:ArcGISTiledMapServiceLayer 
                Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer" />
  </esri:Map>
  <esri:Legend Map="{Binding ElementName=MyMap}"
                         LayerItemsMode="Tree"
       VerticalAlignment="Top" HorizontalAlignment="Right" />

  <Button VerticalAlignment="Top" HorizontalAlignment="Left" Content="Add Layer" Click="Button_Click"/>
 </Grid>

  private void Button_Click(object sender, RoutedEventArgs e)
  {
   var l = new GraphicsLayer() { ID = "MyLayer" };
   l.Renderer = new SimpleRenderer()
   {
    Symbol = new SimpleMarkerSymbol()
    {
     Color = new SolidColorBrush(Colors.Blue),
     Size = 20d,
     Style = SimpleMarkerSymbol.SimpleMarkerStyle.Square
    },
    Label = "Locations"
   };
   l.Graphics.Add(new Graphic() { Geometry = new MapPoint(-140.9, 63.391, new SpatialReference(4326)) });
   MyMap.Layers.Add(l);
  }

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Esri Legend - dynamically adding layers during runtime

Re: Esri Legend - dynamically adding layers during runtime