Share Email Facebook Twitter LinkedIn Definitions.IsEmpty Property Identifies if the definitions collection is empty.Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34) Syntax C# public bool IsEmpty { get; }Property ValueBoolean See AlsoReferenceDefinitions ClassAutodesk.Revit.DB Namespace