topic Re: esriToolkitPrimitives Legend sync in ArcGIS API for Silverlight Questions

esriToolkitPrimitives Legend sync

SantoshV — Sat, 01 Oct 2011 07:43:13 GMT

HI,

I have a FeatureLayer

        <esri:Map x:Name="MyMap" >

            <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer"
                    Url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"/>
            <esri:FeatureLayer ID="MyFeatureLayer2"
              Url="http://192.168.1.52/ArcGIS/rest/services/RMS_BOUNDARIES/MapServer/1"
              Where="DISTRICT_ID = 5"   >
            </esri:FeatureLayer>
        </esri:Map>

here the map shows the District whos ID is 5..
but when I bind this featureLayer to esriToolkitPrimitives

<ScrollViewer Grid.Row="1" VerticalScrollBarVisibility="Auto">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*" />
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>
                        <ListBox Margin="0" IsHitTestVisible="False" BorderThickness="0"
                         ItemsSource="{Binding ElementName=MyMap, Path=Layers.[MyFeatureLayer2].LayerInfo.Renderer.Infos}" 
                         Grid.Row="1">
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Horizontal">
                                        <esriToolkitPrimitives:SymbolDisplay 
                                    Symbol="{Binding Symbol}" 
                                    Width="20" Height="20"                                     
                                    VerticalAlignment="Center" />
                                        <TextBlock Text="{Binding Label}" 
                                           FontSize="10" 
                                           VerticalAlignment="Center"
                                           Margin="5,0,0,0" />
                                    </StackPanel>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </Grid>
                </ScrollViewer>

The listbox still shows all the layers in it..
I want to only show the Item whose Id is 5

how do i achieve this

Re: esriToolkitPrimitives Legend sync

DominiqueBroux — Mon, 03 Oct 2011 07:14:59 GMT

The problem is coming from your ItemsSource binding:

ItemsSource="{Binding ElementName=MyMap, Path=Layers.[MyFeatureLayer2].LayerInfo.Renderer.Infos}"

With this binding you will get all renderer infos whatever it's used or not.

One option is you to implement by code your own enumeration that returns only the symbols used in the layer.

Re: esriToolkitPrimitives Legend sync

SantoshV — Mon, 03 Oct 2011 09:12:40 GMT

The problem is coming from your ItemsSource binding:

With this binding you will get all renderer infos whatever it's used or not.

One option is you to implement by code your own enumeration that returns only the symbols used in the layer.

Hi,
Thanks you for your reply I have been breaking my head over this trying to remove items from the Legend control..
Can you please throw in a little bit of code that would help me overcome this issue

Re: esriToolkitPrimitives Legend sync

DominiqueBroux — Tue, 04 Oct 2011 06:56:44 GMT

See this thread for an answer concerning the legend control.

Looks like whatever you use the legend control or your own control, the problem is the same, how to know the useful renderer items from a where clause.

Re: esriToolkitPrimitives Legend sync

SantoshV — Sat, 11 Dec 2021 19:15:23 GMT

The legend control worked well

ESRI.ArcGIS.Client.Toolkit.Legend.RefreshedEventArgs e)
{
  var fLayer = e.LayerItem.Layer as FeatureLayer;
  if (fLayer != null && fLayer.ID == "MyFeatureLayer2" && e.LayerItem.LegendItems != null)
  {
    var toRemove = e.LayerItem.LegendItems.Where(item => item.Label != "7").ToArray(); // Warning : may be a coded value instead of just '7'. Depending on your model
    foreach (var item in toRemove)
      e.LayerItem.LegendItems.Remove(item);
  }
}

but I display the Label with its symbol..
I want to add the length of the polyline(road) in KMs which will be queryed from the database..
is this possible ..