topic Re: MapTip binding to Graphic.Attributes path problem. in ArcGIS API for Silverlight Questions

MapTip binding to Graphic.Attributes path problem.

EduardLucic — Thu, 24 Mar 2011 19:25:10 GMT

I was trying the following:

<esri:Map x:Name="m_internalControl" Background="White">
    <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer" Url="http://services.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"/>
    <esri:GraphicsLayer ID="MyGraphics" >
        <esri:GraphicsLayer.MapTip>
            <Border BorderBrush="DarkGray" CornerRadius="13" BorderThickness="1" Margin="0,0,15,15">
                <Border.Effect>
                    <DropShadowEffect ShadowDepth="10" BlurRadius="14" Direction="300" />
                </Border.Effect>
                <Border CornerRadius="10" Background="#DDFFEEEE" BorderThickness="5" BorderBrush="#77FF0000">
                    <StackPanel Orientation="Vertical" HorizontalAlignment="Center" Margin="10">
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name: " FontWeight="Bold" Foreground="#FF0F274E" FontSize="10" VerticalAlignment="Center"/>
                            <TextBlock Text="{Binding [GraphicData].Name}" HorizontalAlignment="Left" VerticalAlignment="Center" />
                        </StackPanel>
                    </StackPanel>
                </Border>
            </Border>
        </esri:GraphicsLayer.MapTip>
    </esri:GraphicsLayer>
</esri:Map>

...

internal class GraphicData : INotifyPropertyChanged
{
  private string _name = null;

  public string Name
  {
    get { return _name; }
    set
    {
      _name = value;
      if (PropertyChanged != null)
      {
        PropertyChanged(this, new PropertyChangedEventArgs("Name"));
      }
    }
  }

  public event PropertyChangedEventHandler PropertyChanged;
}

...

GraphicsLayer gLayer = m_internalControl.Layers["MyGraphics"] as GraphicsLayer;
Graphic g = new Graphic();
g.Symbol = this.Resources["RedMarkerSymbol"] as Symbol;
g.Geometry = new MapPoint(-140.9, 63.391);
g.Attributes["GraphicData"] = new GraphicData() { Name = "Graphic 1" };
gLayer.Graphics.Add(g);

With a WPF application, the MapTip appears as expected with "Name: Graphic 1". With Silverlight, the bound value is empty and the MapTip appears with "Name:". Is there a different notation needed for Silverlight? Is it a bug? I'm using API 2.1.

Thanks,
Ed

Re: MapTip binding to Graphic.Attributes path problem.

EduardLucic — Sat, 11 Dec 2021 22:53:44 GMT

By the way, I have the same issue with custom MarkerSymbol binding:

<esri:MarkerSymbol x:Key="CustomMarkerSymbol">
    <esri:MarkerSymbol.ControlTemplate>
        <ControlTemplate>
            <Grid>
                <TextBlock Text="{Binding Attributes[GraphicData].Name}" />
            </Grid>
        </ControlTemplate>
    </esri:MarkerSymbol.ControlTemplate>
</esri:MarkerSymbol>

Works in WPF, but not in Silverlight.

Ed

Re: MapTip binding to Graphic.Attributes path problem.

JenniferNery — Fri, 25 Mar 2011 16:49:18 GMT

I tried your code in Silverlight and WPF. You are right WPF allows you to access internal class GraphicData. Your syntax is perfectly fine but Silverlight cannot access this internal class. If you make GraphicData class public, it should work.

http://connect.microsoft.com/VisualStudio/feedback/details/526229/in-silverlight-4-binding-to-an-internal-data-by-code-doesnt-work

Re: MapTip binding to Graphic.Attributes path problem.

EduardLucic — Fri, 25 Mar 2011 16:58:13 GMT

Thanks Jennifer! Worked like a charm 😉

Ed