This method is used to erase one item in the map. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- key
-  Type:  Autodesk.Revit.DB Definition  
 
Remarks
 The method Erase inherited from base class is not permitted for this class. A Autodesk::Revit::Exceptions::InvalidOperationException will be thrown. Use Remove() instead to remove the binding from the Revit session and from the map.