ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Events Namespace / AsyncPresentationEvent<TPayload> Class / OnLastUnregister Method

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    OnLastUnregister Method (AsyncPresentationEvent<TPayload>)
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    Called when the last subscriber unsubscribes from this event.
    Syntax
    protected virtual void OnLastUnregister()
    Protected Overridable Sub OnLastUnregister() 
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also