Checks if given Reference identifies either a valid element or subelement. 
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2018 
Syntax
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Parameters
- aDoc
- Type: Autodesk.Revit.DBDocument
 The document.
- reference
- Type: Autodesk.Revit.DBReference
 The reference that identifies an element or subelement.
Return Value
True if %reference% identifies a valid element or subelement, false otherwise.Remarks
 A reference to an element or subelement in a linked document is acceptable. 
Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.ExceptionsArgumentNullException | A non-optional argument was null |