Share Email Facebook Twitter LinkedIn Definitions.IsEmpty Property Identifies if the definitions collection is empty.Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0) Syntax C# public bool IsEmpty { get; }Property ValueBoolean See AlsoReferenceDefinitions ClassAutodesk.Revit.DB Namespace