Selects the elements. 
   Namespace:   Autodesk.Revit.UI.Selection  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 23.0.0.0 (23.1.0.0) 
  Since:  2015 
Syntax
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Parameters
- elementIds
-  Type:  System.Collections.Generic ICollection   ElementId  
 The ids of the elements to be selected.
Remarks
 This function will select the specified elements within the project and update the UI. See  SetReferences  for more selection options. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null | 
| Autodesk.Revit.Exceptions InvalidOperationException | Changing the selection is not permitted while handling SelectionChanged Event. |