Share Email Facebook Twitter LinkedIn ParameterFilterElement.GetCategories Method Gets the categories admitted by this filter. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0) Syntax C# public ICollection<ElementId> GetCategories()Return ValueICollection<ElementId> See AlsoReferenceParameterFilterElement ClassAutodesk.Revit.DB Namespace