When Temporary View Properties mode is in progress it provides DBView ID that overrode settings for current view.
Outside Temporary View Properties mode InvalidElementId will be returned.
Namespace:
Autodesk.Revit.DB
Assembly:
RevitAPI
(in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since:
2014
Syntax
Remarks
Returned ElementId might refer to element that was deleted.
It will happen when Temporary View Properties mode was applied basing on template that next was deleted.