Share Email Facebook Twitter LinkedIn ElementCategoryFilter.CategoryId Property The category id. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0) Syntax C# public ElementId CategoryId { get; }Property ValueElementId See AlsoReferenceElementCategoryFilter ClassAutodesk.Revit.DB Namespace