Share Email Facebook Twitter LinkedIn DefinitionGroups.IsEmpty Property Identifies if the definition groups collection is empty.Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0) Syntax C# public bool IsEmpty { get; }Property ValueBoolean See AlsoReferenceDefinitionGroups ClassAutodesk.Revit.DB Namespace