The RebarShape element that defines the shape of the rebar. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2013 
Syntax
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Remarks
 Changing the value of this property causes the Rebar instance to choose values for its shape parameters to preserve its previous shape as closely as possible 
 Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions ArgumentException | When setting this property: shapeId is not the id of a RebarShape in the document. | 
| Autodesk.Revit.Exceptions ArgumentNullException | When setting this property: A non-optional argument was NULL | 
| Autodesk.Revit.Exceptions DisabledDisciplineException | When setting this property: None of the following disciplines is enabled: Structural. | 
| Autodesk.Revit.Exceptions InvalidOperationException | When setting this property: This method applies only to shape driven rebar. |