ArcGIS Pro 3.2 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / UnclassedColorsRendererDefinition Class / NullValueLabel Property
Example

In This Topic
    NullValueLabel Property (UnclassedColorsRendererDefinition)
    In This Topic
    Gets or sets the out of range label used in the renderer.
    Syntax
    public string NullValueLabel {get; set;}
    Public Property NullValueLabel As String
    Example
    Create an Unclassed Renderer
    string colorBrewerSchemesName = "ArcGIS Colors";
    StyleProjectItem style = Project.Current.GetItems<StyleProjectItem>().First(s => s.Name == colorBrewerSchemesName);
    string colorRampName = "Heat Map 4 - Semitransparent";
    IList<ColorRampStyleItem> colorRampList = await QueuedTask.Run(() =>
    {
      return style.SearchColorRamps(colorRampName);
    });
    ColorRampStyleItem colorRamp = colorRampList[0];
    
    await QueuedTask.Run(() =>
    {
      CIMPointSymbol pointSym = SymbolFactory.Instance.ConstructPointSymbol(ColorFactory.Instance.GreenRGB, 16.0, SimpleMarkerStyle.Diamond);
      CIMSymbolReference symbolPointTemplate = pointSym.MakeSymbolReference();
    
      //defining an unclassed renderer with custom upper and lower stops
      //all features with value >= 5,000,000 will be drawn with the upper color from the color ramp
      //all features with value <= 50,000 will be drawn with the lower color from the color ramp
      UnclassedColorsRendererDefinition unclassRndrDef = new UnclassedColorsRendererDefinition
                            ("Population", symbolPointTemplate, colorRamp.ColorRamp, "Highest", "Lowest", 5000000, 50000)
      {
    
        //drawing features with null values with a different symbol
        ShowNullValues = true,
        NullValueLabel = "Unknown"
      };
      CIMPointSymbol nullSym = SymbolFactory.Instance.ConstructPointSymbol(ColorFactory.Instance.RedRGB, 16.0, SimpleMarkerStyle.Circle);
      unclassRndrDef.NullValueSymbol = nullSym.MakeSymbolReference();
      FeatureLayer flyr = MapView.Active.Map.Layers[0] as FeatureLayer;
      CIMClassBreaksRenderer cbRndr = flyr.CreateRenderer(unclassRndrDef) as CIMClassBreaksRenderer;
      flyr.SetRenderer(cbRndr);
    });
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also