Share Email Facebook Twitter LinkedIn ScheduleDefinition.CategoryId Property The category ID of elements appearing in the schedule. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.3.0.0 (26.3.0.0) Syntax C# public ElementId CategoryId { get; }Property ValueElementId Remarks Most schedules show elements of a single category. In multi-category schedules, the category ID is InvalidElementId. In key schedules, the schedule's category is the category of elements that the keys are associated with. See AlsoReferenceScheduleDefinition ClassAutodesk.Revit.DB Namespace