Share Email Facebook Twitter LinkedIn FilterCategoryRule.GetCategories Method Gets the rule's categories. 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 AlsoReferenceFilterCategoryRule ClassAutodesk.Revit.DB Namespace