ArcGIS Pro 2.9 API Reference Guide
OnFirstRegister Method (CompositePresentationEvent<TPayload>)

ArcGIS.Core.Events Namespace > CompositePresentationEvent<TPayload> Class : OnFirstRegister Method
Called when the first subscriber subscribes to this event.
Syntax
protected virtual void OnFirstRegister()
Protected Overridable Sub OnFirstRegister() 
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

See Also

Reference

CompositePresentationEvent<TPayload> Class
CompositePresentationEvent<TPayload> Members