Identifies the number of bars in rebar set. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2013 
Syntax
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Remarks
 Quantity is equal to NumberOfBarPositions if all the bars are included. If any bars are excluded, they are not counted in the Quantity.