The base class used for pre events where the arguments must supply access to the document. 
   Namespace:   Autodesk.Revit.DB.Events  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2010 
Syntax
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Inheritance Hierarchy
  System Object  
System EventArgs
Autodesk.Revit.DB.Events RevitAPIEventArgs
Autodesk.Revit.DB.Events RevitAPIPreEventArgs
Autodesk.Revit.DB.Events RevitAPIPreDocEventArgs
Autodesk.Revit.DB.Events DocumentClosingEventArgs
Autodesk.Revit.DB.Events DocumentPrintingEventArgs
Autodesk.Revit.DB.Events DocumentSavingAsEventArgs
Autodesk.Revit.DB.Events DocumentSavingEventArgs
Autodesk.Revit.DB.Events DocumentSynchronizingWithCentralEventArgs
Autodesk.Revit.DB.Events ElementTypeDuplicatingEventArgs
Autodesk.Revit.DB.Events FamilyLoadingIntoDocumentEventArgs
Autodesk.Revit.DB.Events FileExportingEventArgs
Autodesk.Revit.DB.Events FileImportingEventArgs
Autodesk.Revit.DB.Events ViewExportingEventArgs
Autodesk.Revit.DB.Events ViewPrintingEventArgs
Autodesk.Revit.UI.Events TransferringProjectStandardsEventArgs
Autodesk.Revit.UI.Events ViewActivatingEventArgs
 
 System EventArgs
Autodesk.Revit.DB.Events RevitAPIEventArgs
Autodesk.Revit.DB.Events RevitAPIPreEventArgs
Autodesk.Revit.DB.Events RevitAPIPreDocEventArgs
Autodesk.Revit.DB.Events DocumentClosingEventArgs
Autodesk.Revit.DB.Events DocumentPrintingEventArgs
Autodesk.Revit.DB.Events DocumentSavingAsEventArgs
Autodesk.Revit.DB.Events DocumentSavingEventArgs
Autodesk.Revit.DB.Events DocumentSynchronizingWithCentralEventArgs
Autodesk.Revit.DB.Events ElementTypeDuplicatingEventArgs
Autodesk.Revit.DB.Events FamilyLoadingIntoDocumentEventArgs
Autodesk.Revit.DB.Events FileExportingEventArgs
Autodesk.Revit.DB.Events FileImportingEventArgs
Autodesk.Revit.DB.Events ViewExportingEventArgs
Autodesk.Revit.DB.Events ViewPrintingEventArgs
Autodesk.Revit.UI.Events TransferringProjectStandardsEventArgs
Autodesk.Revit.UI.Events ViewActivatingEventArgs