ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping.Events Namespace / MapSelectionChangedEventArgs Class / Selection Property

Selection Property (MapSelectionChangedEventArgs)
Gets the selection.
Syntax
public SelectionSet Selection {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also