ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Geometry Namespace / Envelope Class / Length3D Property
Version

Length3D Property (Envelope)
Gets the 3D length of the perimeter of this instance.
Syntax
public double Length3D {get;}
Exceptions
ExceptionDescription
The geometry is not Z-Aware.
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also