Gets the subelement referenced by a unique id string. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2018 
Syntax
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| Visual Basic | 
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Parameters
- uniqueId
 -  Type:  System String  
The unique id that identifies element or subelement.- UniqueId
  
Return Value
The subelement referenced by the input argument.Remarks
    a null reference (  Nothing  in Visual Basic)  will be returned if the input id string doesn't reference to a valid element or subelement. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |