|  Rebar  | 
 Return the parameter's formula, if one is associated with it. 
 Namespace: Autodesk.Revit.DB.Structure
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
 Syntax
 Syntax  Parameters
- paramId ElementId
- Id of a parameter in the definition.
Return Value
StringThe formula, or an empty string if there is no formula for the parameter.
 Exceptions
 Exceptions  | Exception | Condition | 
|---|---|
| ArgumentException | This RebarShapeDefinition does not have a value for the parameter paramId. | 
| ArgumentNullException | A non-optional argument was null | 
 See Also
 See Also