SimpleLineSymbol display in Legend

SantoshV — Thu, 17 Feb 2011 07:38:54 GMT

HI ,
I have written the below code

 
            <esriSymbols:SimpleLineSymbol x:Name="LineSymbolDeepPink" Color="DeepPink" Width="3" />
            <esriSymbols:SimpleLineSymbol x:Name="LineSymbolRed" Color="Red"  Width="3" />

                   for (int i = 0; i < featureSet.Features.Count(); i++)
                    {
                        selectedFeature = featureSet.Features;
                        if (selectedFeature.Attributes["ROAD_CATEGORY"].ToString() == "1")
                        {
                            selectedFeature.Symbol = LineSymbolDeepPink;
                        }
                        else if (selectedFeature.Attributes["ROAD_CATEGORY"].ToString() == "2")
                        {
                            selectedFeature.Symbol = LineSymbolGreen;
                        }

                        graphicsLayer.Graphics.Add(selectedFeature);
                    }
                    //   Hightlight selected feature
                    graphicsLayer.Graphics.Add(selectedFeature);

The graphic shows on the map but Does not show on the Legend

I tried


                <esri:UniqueValueRenderer.Infos>
                    <esri:UniqueValueInfo Value="1" Symbol="{StaticResource LineSymbolDeepPink}" />
                    <esri:UniqueValueInfo Value="2" Symbol="{StaticResource LineSymbolRed}" />
                </esri:UniqueValueRenderer.Infos> 
and also
                <!--<esri:UniqueValueInfo Symbol="{StaticResource LineSymbolDeepPink}">
                    <esri:UniqueValueInfo.Value>
                        <sys:Int32>1</sys:Int32>
                    </esri:UniqueValueInfo.Value>
                </esri:UniqueValueInfo>
                <esri:UniqueValueInfo Symbol="{StaticResource LineSymbolRed}">
                    <esri:UniqueValueInfo.Value>
                        <sys:Int32>2</sys:Int32>
                    </esri:UniqueValueInfo.Value>
                </esri:UniqueValueInfo>

but either the legend wont show or the graphic wont show
what am I missing here? I want to show only the queried ROAD_CATEGORY on the map and the legend

Re: SimpleLineSymbol display in Legend

JenniferNery — Fri, 10 Dec 2021 20:07:34 GMT

Based on the code-snippet you provided, you are trying to use a Renderer with Symbol. This will not work, you have to choose one or the other.

If you want to take advantage of the Legend control, you need to use the Renderer version. But the UniqueValueInfo.Value must match the field attribute in order for the symbol to show. Notice when you were updating the symbol, the comparison was:

selectedFeature.Attributes["ROAD_CATEGORY"].ToString() == "1")

You had to convert them to the same data type. The same thing holds true for UniqueValueRenderer, data type is also checked against. If neither string "1" nor int 1 worked, then maybe first check what the field data type is, maybe it's a double.

You can check when the layer gets Initialized using the following code:

FeatureLayer l = sender as FeatureLayer;
Field.FieldType type = Field.FieldType.Unknown;
foreach (var f in l.LayerInfo.Fields)
{
 if (f.Name == "ROAD_CATEGORY")
 {
  type = f.Type;
  break;
 }
}

topic SimpleLineSymbol display in Legend in ArcGIS API for Silverlight Questions

SimpleLineSymbol display in Legend

Re: SimpleLineSymbol display in Legend