Creates a new instance of a NumberSystem associated to a host element and a view. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2018 
Syntax
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Parameters
- document
-  Type:  Autodesk.Revit.DB Document  
 The document.
- viewId
-  Type:  Autodesk.Revit.DB ElementId  
 The view in which the NumberSystem will be created.
- numberedElementId
-  Type:  Autodesk.Revit.DB LinkElementId  
 The host id on which the NumberSystem will be created.
- referenceCurve
-  Type:  Autodesk.Revit.DB Reference  
 The reference curve along which the NumberSystem will be created. It is suggested to get the new reference via GetNumberSystemReference() from the host element.
Return Value
The created NumberSystem.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | viewId is not valid for placement of a NumberSystem (only floor plan views and elevation views are permitted). -or- numberedElementId is not valid as a host for NumberSystem (only StairsRun elements are permitted in this release). -or- The referenceCurve is not valid for NumberSystem on numberedElementId. -or- The numberedElementId already has a NumberSystem. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |