ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Geometry Namespace / GeometryBag Class / Extent Property

Extent Property (GeometryBag)
Gets the minimum enclosing envelope of this instance.
Syntax
public override Envelope Extent {get;}
Remarks
This is the smallest Envelope that contains the geometries in the GeometryBag.
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.1 or higher.
See Also