Specify a dimension between two bends, measured by a read-only parameter. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- paramId
 -  Type:  Autodesk.Revit.DB ElementId  
Id of a parameter to report the length of the dimension. The parameter will be read-only on Rebar instances. 
- constraintDirCoordX
 -  Type:  System Double  
The x-coordinate of a 2D vector specifying the constraint direction. 
- constraintDirCoordY
 -  Type:  System Double  
The y-coordinate of a 2D vector specifying the constraint direction. 
- iSegment0
 -  Type:  System Int32  
Index of the first segment (0 to NumberOfSegments - 1). 
- iEnd0
 -  Type:  System Int32  
End (0 or 1) of the first segment. 
- iSegment1
 -  Type:  System Int32  
Index of the second segment (0 to NumberOfSegments - 1). 
- iEnd1
 -  Type:  System Int32  
End (0 or 1) of the second segment. 
Remarks
 Each reference is at the outside of the bend, perpendicular to the specified segment. So the overall length of a shape with 5 segments might be defined by calling this function with iSegment0=0, iEnd0=0, iSegment1=4, iEnd1=1. 
 Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions ArgumentException | paramId is not the id of a shared parameter in the current document, or its unit type is not UT_Reinforcement_Length or UT_Angle. -or- The length of the vector (constraintDirCoordX, constraintDirCoordY) is too close to zero. -or- iSegment0 is not between 0 and NumberOfSegments. -or- iEnd0 is neither 0 nor 1. -or- iSegment1 is not between 0 and NumberOfSegments. -or- iEnd1 is neither 0 nor 1. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |