topic Setting ClassBreaksInfo in ClassBreaksRenderer in ArcGIS API for Silverlight Questions

Setting ClassBreaksInfo in ClassBreaksRenderer

ScottBridwell — Wed, 19 May 2010 16:58:32 GMT

I'm trying to dynamically apply a renderer to a feature layer without iterating and applying a symbol to each graphic. Unfortunately, the ClassBreaksRenderer.Classes property (ObservableCollextion<ClassBreaksInfo>) is read only. Does anybody know how to get around this or is not possible to make changes to a class breaks renderer?

thanks,
scott

Re: Setting ClassBreaksInfo in ClassBreaksRenderer

DominiqueBroux — Wed, 19 May 2010 17:13:50 GMT

The ClassBreaksRenderer.Classes property is read-only, but the underlying ObservableCollection can be modified :
ClassBreaksRenderer.Classes.Add(myClassBreakInfo) or
ClassBreaksRenderer.Classes.Remove(myClassBreakInfo)

Re: Setting ClassBreaksInfo in ClassBreaksRenderer

SantoshV — Sat, 11 Dec 2021 18:09:39 GMT

Hey runtime is good I tried doin it like this

classBreakInfo.MinimumValue = Convert.ToInt32(strLeftWidth.Substring(1, intIndex));
classBreakInfo.MaximumValue = Convert.ToInt32(strRightWidth.Substring(1, intIndex));
classBreakInfo.Symbol = LayoutRoot.Resources["LineSymbolRed"] as Symbol;
MyClassBreaksRenderer.Classes.Add(classBreakInfo);
graphicsLayer.Renderer = MyClassBreaksRenderer;

but my graphic layer is not returning to the map what am I missing here ?

Re: Setting ClassBreaksInfo in ClassBreaksRenderer

JenniferNery — Sat, 11 Dec 2021 18:09:41 GMT

It's hard to tell where the problem could be without knowing how the ClassBreaksRenderer was created. It might be that the Attribute of ClassBreaksRenderer does not match an OutField in your FeatureLayer or the symbol does not match the geometry type of the layer.

http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#FeatureLayerRendering
The equivalent code-behind of the XAML in this sample is as follows:

private void FeatureLayer_Initialized(object sender, System.EventArgs e)
{
 FeatureLayer layer = sender as FeatureLayer;   
 ClassBreaksRenderer classBreaksRenderer = new ClassBreaksRenderer()
 {
  Attribute = "POP07_SQMI"
 };
 classBreaksRenderer.Classes.Add(
  new ClassBreakInfo() 
  { 
   MinimumValue = 0d, 
   MaximumValue = 50d, 
   Symbol = this.LayoutRoot.Resources["LowFillSymbol"] as Symbol
  }
 );

 classBreaksRenderer.Classes.Add(
  new ClassBreakInfo()
  {
   MinimumValue = 50d,
   MaximumValue = 200d,
   Symbol = this.LayoutRoot.Resources["MediumFillSymbol"] as Symbol
  }
 );

 classBreaksRenderer.Classes.Add(
  new ClassBreakInfo()
  {
   MinimumValue = 200d,
   MaximumValue = 5000d,
   Symbol = this.LayoutRoot.Resources["HighFillSymbol"] as Symbol
  }
 );
 layer.Renderer = classBreaksRenderer;   
}