Share Email Facebook Twitter LinkedIn ParameterDownloadOptions.GetCategories Method Get categories for binding. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0) Syntax C# public ISet<ElementId> GetCategories()Return ValueISet<ElementId> See AlsoReferenceParameterDownloadOptions ClassAutodesk.Revit.DB Namespace