Gets the external file referencing data for the given element. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Parameters
- aDoc
-  Type:  Autodesk.Revit.DB Document  
 A Revit Document.
- elemId
-  Type:  Autodesk.Revit.DB ElementId  
 The element whose external file reference we want.
Return Value
An object containing path and type information for the given element's external file.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | The element elemId does not exist in the document -or- elemId does not represent an external file reference. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |