This method creates a constraint for a given Rebar Constrained Handle Tag. Will throw exception if used for Shape Driven Rebar. 
Namespace: Autodesk.Revit.DB.Structure
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2018 
Syntax
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Parameters
- handle
- Type: Autodesk.Revit.DB.StructureRebarConstrainedHandle
 The handle of the rebar that will be constrained.
- targetReferences
- Type: System.Collections.GenericIListReference
 The references to which the rebar handle will be constrained. This collection must contain one or more references to faces of elements that can host rebar.
- isConstraintToCover
- Type: SystemBoolean
 If true the RebarConstraintType will be set to ToCover, otherwise RebarConstraintType will be set to FixedDistanceToHostFace.
- offsetValue
- Type: SystemDouble
 The distance from references to the rebar handle.
Return Value
Returns the newly created RebarConstraint.Exceptions
| Exception | Condition | 
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| Autodesk.Revit.ExceptionsArgumentException | Constrained rebar is a shape driven rebar element. -or- handle is no longer valid. -or- targetReferences is empty. -or- targetReferences do not represent faces from structurals that can host rebar. | 
| Autodesk.Revit.ExceptionsArgumentNullException | A non-optional argument was null |