The class is used as base class for the arguments of any pre-event arguments that is associated to a particular Document. 
   Namespace:   Autodesk.Revit.DB.Events  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Inheritance Hierarchy
  System Object  
System EventArgs
Autodesk.Revit.DB.Events RevitEventArgs
Autodesk.Revit.DB.Events PreEventArgs
Autodesk.Revit.DB.Events PreDocEventArgs
 
 System EventArgs
Autodesk.Revit.DB.Events RevitEventArgs
Autodesk.Revit.DB.Events PreEventArgs
Autodesk.Revit.DB.Events PreDocEventArgs