The event arguments used by the FamilyLoadingInto event. 
Namespace: Autodesk.Revit.DB.Events
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2015 
Syntax
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Inheritance Hierarchy
SystemObject
SystemEventArgs
Autodesk.Revit.DB.EventsRevitAPIEventArgs
Autodesk.Revit.DB.EventsRevitAPIPreEventArgs
Autodesk.Revit.DB.EventsRevitAPIPreDocEventArgs
Autodesk.Revit.DB.EventsFamilyLoadingIntoDocumentEventArgs
SystemEventArgs
Autodesk.Revit.DB.EventsRevitAPIEventArgs
Autodesk.Revit.DB.EventsRevitAPIPreEventArgs
Autodesk.Revit.DB.EventsRevitAPIPreDocEventArgs
Autodesk.Revit.DB.EventsFamilyLoadingIntoDocumentEventArgs