Sets the Layout Rule property of rebar set to NumberWithSpacing 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2009 
Syntax
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Parameters
- numberOfBarPositions
 -  Type:  System Int32  
The number of bar positions in rebar set 
- spacing
 -  Type:  System Double  
The maximum spacing between rebar in rebar set 
- barsOnNormalSide
 -  Type:  System Boolean  
Identifies if the bars of the rebar set are on the same side of the rebar plane indicated by the normal 
- includeFirstBar
 -  Type:  System Boolean  
Identifies if the first bar in rebar set is shown 
- includeLastBar
 -  Type:  System Boolean  
Identifies if the last bar in rebar set is shown 
Remarks
 When changing the layout rule to NumberWithSpacing, you must also simultaneously set NumberOfBarPositions, Spacing, BarsOnNormalSide, IncludeFirstBar, and IncludeLastBar properties. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | the number of bar positions numberOfBarPositions is less than 1 or more than 1002. -or- The spacing isn't bigger than 0.0. | 
| Autodesk.Revit.Exceptions DisabledDisciplineException | None of the following disciplines is enabled: Structural. | 
| Autodesk.Revit.Exceptions InapplicableDataException | This Rebar is an instance of a spiral or multiplanar shape. | 
| Autodesk.Revit.Exceptions InvalidOperationException | This method applies only to shape driven rebar. |