ArcGIS Pro 2.6 API Reference Guide
CreateFeatureLayer(CIMDataConnection,ILayerContainerEdit,Int32,String,RendererDefinition) Method
Example 

ArcGIS.Desktop.Mapping Namespace > LayerFactory Class > CreateFeatureLayer Method : CreateFeatureLayer(CIMDataConnection,ILayerContainerEdit,Int32,String,RendererDefinition) Method
A CIMDataConnection
A map or group layer instance to which the Feature Layer will be added
The position of the Feature Layer in the map or group layer. 0 represents the top most position.
(optional) When it is not provided, the default display name gets used e.g. the dataset name or alias. (default value = "")
(optional) Provide a RendererDefinition to create a FeatureLayer with your custom renderer instead of the default renderer that gets generated automatically. (default value = null)
Overloaded. Create a new Feature Layer instance using a CIMDataConnection and adds that to a container such as a map or group layer. Optionally you can provide a name and rendererDefinition to override the default display name and renderer respectively. This method must be called on the MCT. Use QueuedTask.Run
Syntax

Parameters

dataConnection
A CIMDataConnection
mapOrGroupLayer
A map or group layer instance to which the Feature Layer will be added
index
The position of the Feature Layer in the map or group layer. 0 represents the top most position.
layerName
(optional) When it is not provided, the default display name gets used e.g. the dataset name or alias. (default value = "")
rendererDefinition
(optional) Provide a RendererDefinition to create a FeatureLayer with your custom renderer instead of the default renderer that gets generated automatically. (default value = null)

Return Value

Exceptions
ExceptionDescription
This method or property must be called within the lambda passed to QueuedTask.Run.
Example
Create a query layer.
await QueuedTask.Run(() =>
{
    Map map = MapView.Active.Map;
    Geodatabase geodatabase = new Geodatabase(new DatabaseConnectionFile(new Uri(@"C:\Connections\mySDE.sde")));
    CIMSqlQueryDataConnection sqldc = new CIMSqlQueryDataConnection()
    {
        WorkspaceConnectionString = geodatabase.GetConnectionString(),
        GeometryType = esriGeometryType.esriGeometryPolygon,
        OIDFields = "OBJECTID",
        Srid = "102008",
        SqlQuery = "select * from MySDE.dbo.STATES",
        Dataset = "States"
    };
    FeatureLayer flyr = (FeatureLayer)LayerFactory.Instance.CreateLayer(sqldc, map, layerName: "States");
});
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

LayerFactory Class
LayerFactory Members
Overload List