Share Email Facebook Twitter LinkedIn BuiltInFailures.RoofFailures.UserCancelledRoof Property Cancelled. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34) Syntax C# public static FailureDefinitionId UserCancelledRoof { get; }Property ValueFailureDefinitionId See AlsoReferenceBuiltInFailures.RoofFailures ClassAutodesk.Revit.DB Namespace