Share Email Facebook Twitter LinkedIn ExportIFCCategoryKey Constructor Constructs a new ExportIFCCategoryKey with default values. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0) Syntax C# public ExportIFCCategoryKey() See AlsoReferenceExportIFCCategoryKey ClassExportIFCCategoryKey OverloadAutodesk.Revit.DB Namespace