Gets the number system reference corresponding to the given reference options. 
   Namespace:   Autodesk.Revit.DB.Architecture  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Parameters
- referenceOption
 -  Type:  Autodesk.Revit.DB.Architecture StairsNumberSystemReferenceOption  
The reference option. 
Return Value
The reference.Remarks
 The return value of this function is suitable for use in NumberSystem.Create() to associate a NumberSystem with the location on the StairsRun. Don't try to get geometry curve from the reference. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | A value passed for an enumeration argument is not a member of that enumeration |