GraphicsLayer Symblol in LegendControl

LanceCrumbliss — Fri, 22 Jul 2011 20:35:27 GMT

How do you bind a symbol to the Legend Control? I understand that this may not be possible considering that it's the graphic itself and not the GraphicsLayer that has a symbol property. If that is the case, then what alternative approaches are there?

Lance

Re: GraphicsLayer Symblol in LegendControl

DanDong — Sun, 12 Dec 2021 16:48:19 GMT

Hi Lance,

If I understand your question correctly, you could assign simplerender to the symbol you use in the graphicslayer.
Here is how I did in my application:
In xaml:

<Grid.Resources>
<esri:FillSymbol x:Key="ResultsFillSymbol" Fill="#880000FF">
<esri:SimpleRenderer x:Key="selectPolygonSymbolRender"  Symbol="{StaticResource ResultsFillSymbol}"/>
</Grid.Resources>

In Code-behind:

GraphicsLayer graphicsLayer = MyMap.Layers["Selection Results"] as GraphicsLayer;
graphicsLayer.Renderer = LayoutRoot.Resources["selectPolygonSymbolRender"] as SimpleRenderer;
foreach (Graphic feature in featureSet.Features)
     {
          feature.Symbol = LayoutRoot.Resources["ResultsFillSymbol"] as FillSymbol;
          graphicsLayer.Graphics.Insert(0, feature);
     }

You also need to modify the layerids property of the legend control in code-behind:

if (!MyLegend.LayerIDs.Contains("Selection Results"))
                {
                    legendIDcount++;
                    MyLegend.LayerIDs.SetValue("Selection Results", legendIDcount);
                }
//legendIDcount is a global variable defined in the beginning.

Make sure to leave the place for the new graphicslayer. If you don't put a, b,c,d in the layerids property, it looks like new id couldn't be added.
In Xaml:

<esri:Legend x:Name="MyLegend" Map="{Binding ElementName=MyMap}" Grid.Row="2" Background="#FFFFFFCC" BorderBrush="#FFFFFFCC" HorizontalAlignment="Left" Margin="3,3" Width="260"
LayerItemsMode="Flat"  ShowOnlyVisibleLayers="True" LayerIDs="Visible Layers,a,b,c,d">

Hope this helps.

Re: GraphicsLayer Symblol in LegendControl

LanceCrumbliss — Sat, 23 Jul 2011 01:00:49 GMT

That works perfectly. Thanks Shirley!

Lance

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GraphicsLayer Symblol in LegendControl

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Re: GraphicsLayer Symblol in LegendControl