The ElementId of the imported instance that represents the imported object(s) after a successful import. It could be used for further manipulation of that instance.
Namespace: Autodesk.Revit.DB.Events
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
public ElementId ImportedInstanceId { get; }
The value could be InvalidElementId for some type of import formats, such as GBXML and Inventor files.