ArcGIS Pro 2.6 API Reference Guide
Envelope Class
Members 

ArcGIS.Core.Geometry Namespace : Envelope Class
An envelope is an axis-aligned box described by the coordinates of the lower left corner and the coordinates of the upper right corner.
Object Model
Envelope ClassMapPoint ClassEnvelope ClassCoordinate2D StructureGeometry ClassEnvelope ClassEnvelope ClassEnvelope ClassSpatialReference ClassEnvelope Class
Syntax
public sealed class Envelope : Geometry 
Public NotInheritable Class Envelope 
   Inherits Geometry
Inheritance Hierarchy

System.Object
   ArcGIS.Core.Geometry.Geometry
      ArcGIS.Core.Geometry.Envelope

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

Envelope Members
ArcGIS.Core.Geometry Namespace