For shape driven rebar returns all possible RebarConstraints belonging to references from the provided element that could be used for a specified RebarConstrainedHandle.
For free form rebar will return an empty list.
Namespace: Autodesk.Revit.DB.Structure
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2020.1 
Syntax
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Parameters
- handle
- Type: Autodesk.Revit.DB.StructureRebarConstrainedHandle
 The RebarConstrainedHandle for which constraint candidates are sought.
- elementId
- Type: Autodesk.Revit.DBElementId
 The elementId ( host or rebar ) of the element in which the candidates are searched for.
Return Value
A collection of RebarConstraintsRemarks
 Will throw exception if the provided elementId is not a valid constraint target. 
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.ExceptionsArgumentException | elementId is not a valid RebarConstraint target element. | 
| Autodesk.Revit.ExceptionsArgumentNullException | A non-optional argument was null | 
| Autodesk.Revit.ExceptionsInvalidOperationException | The RebarConstraintsManager does not manage a valid Rebar element. |