ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / SubtypeGroupLayer Class
Members Example Version

SubtypeGroupLayer Class
Represents a composite layer with a collection of feature layers for each ArcGIS.Core.Data.Subtype of its source ArcGIS.Core.Data.FeatureClass and their visual representation and editing (when permitted).
Object Model
SubtypeGroupLayer ClassDefinitionQuery ClassLayer ClassCIMDataConnection ClassTimeExtent ClassCIMBaseLayer ClassElevationTypeDefinition ClassSpatialReference ClassTimeParameters ClassSurfaceZsResult ClassMap ClassILayerContainer InterfaceEnvelope ClassDefinitionQuery Class
Syntax
Remarks
To create a SubtypeGroupLayer, you must call LayerFactory.CreateLayer<T> and pass in a SubtypeGroupLayerCreationParams, instead of directly using a constructor.
Example
Create a new SubTypeGroupLayer
var subtypeGroupLayerCreateParam = new SubtypeGroupLayerCreationParams
(
    new Uri(@"c:\data\SubtypeAndDomain.gdb\Fittings")
);

// Define Subtype layers
//At 2.x - var rendererDefn1 = new UniqueValueRendererDefinition(new string[] { "type" });
var rendererDefn1 = new UniqueValueRendererDefinition(new List<string> { "type" });
var renderDefn2 = new SimpleRendererDefinition()
{
  SymbolTemplate = SymbolFactory.Instance.ConstructPointSymbol(
          CIMColor.CreateRGBColor(255, 0, 0), 8, SimpleMarkerStyle.Hexagon).MakeSymbolReference()
};
subtypeGroupLayerCreateParam.SubtypeLayers = new List<SubtypeFeatureLayerCreationParams>()
{
  //define first subtype layer with unique value renderer
  //At 2.x - new SubtypeFeatureLayerCreationParams(new UniqueValueRendererDefinition(new string[] { "type" }), 1),
  new SubtypeFeatureLayerCreationParams(new UniqueValueRendererDefinition(new List<string> { "type" }), 1),

  //define second subtype layer with simple symbol renderer
  new SubtypeFeatureLayerCreationParams(renderDefn2, 2)
};

// Define additional parameters
//At - 2.x subtypeGroupLayerCreateParam.DefinitionFilter = new CIMDefinitionFilter()
//{
//  Name = "IsActive",
//  DefinitionExpression = "Enabled = 1"
//};
subtypeGroupLayerCreateParam.DefinitionQuery = new DefinitionQuery(whereClause: "Enabled = 1", name: "IsActive");
subtypeGroupLayerCreateParam.IsVisible = true;
subtypeGroupLayerCreateParam.MinimumScale = 50000;

SubtypeGroupLayer subtypeGroupLayer2 = LayerFactory.Instance.CreateLayer<SubtypeGroupLayer>(
              subtypeGroupLayerCreateParam, MapView.Active.Map);
Inheritance Hierarchy

System.Object
   ArcGIS.Desktop.Framework.Contracts.PropertyChangedBase
      ArcGIS.Desktop.Mapping.MapMember
         ArcGIS.Desktop.Mapping.Layer
            ArcGIS.Desktop.Mapping.CompositeLayer
               ArcGIS.Desktop.Mapping.SubtypeGroupLayer

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also