Returns the ids of the elements that are currently selected within the project. The selection may not be complete. See  GetReferences  for more options. 
   Namespace:   Autodesk.Revit.UI.Selection  
  Assembly:   RevitAPIUI  (in RevitAPIUI.dll) Version: 23.0.0.0 (23.1.0.0) 
Syntax
| C# | 
|---|
|  | 
| Visual Basic | 
|---|
|  | 
| Visual C++ | 
|---|
|  |