Provides access to the Autodesk::Revit::DB::ElementId^ stored in the given family parameter. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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| Visual Basic | 
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| Visual C++ | 
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Parameters
- familyParameter
-  Type:  Autodesk.Revit.DB FamilyParameter  
 
Return Value
The Autodesk::Revit::DB::ElementId^ contained in the parameter.Returns an invalid element id if the storage type of the input argument is Autodesk::Revit::DB::ElementId^ type or this parameter has no value.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | Thrown when the input argument-"familyParameter"-is a null reference ( Nothing in Visual Basic) . | 
| Autodesk.Revit.Exceptions ArgumentException | Thrown if the input argument-"familyParameter"-is invalid, |