ArcGIS Pro 2.6 API Reference Guide
Host Class
Members 

ArcGIS.Core.Hosting Namespace : Host Class
Represents the Static Core Objects Host class. An instance of this class must be run before calling any classes in ArcGIS.Core.dll in an external program (i.e. "standalone")
Syntax
public class Host 
Public Class Host 
Remarks
ArcGIS.Core.dll can be referenced in stand-alone projects that are not ArcGISPro Add-ins
Inheritance Hierarchy

System.Object
   ArcGIS.Core.Hosting.Host

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

Host Members
ArcGIS.Core.Hosting Namespace