The class is used as base class for all event argument classes. 
Namespace: Autodesk.Revit.DB.Events
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Syntax
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Inheritance Hierarchy
SystemObject
SystemEventArgs
Autodesk.Revit.DB.EventsRevitEventArgs
Autodesk.Revit.DB.EventsPostEventArgs
Autodesk.Revit.DB.EventsPreEventArgs
Autodesk.Revit.UI.EventsCommandEventArgs
SystemEventArgs
Autodesk.Revit.DB.EventsRevitEventArgs
Autodesk.Revit.DB.EventsPostEventArgs
Autodesk.Revit.DB.EventsPreEventArgs
Autodesk.Revit.UI.EventsCommandEventArgs