public override void OnException(ExceptionContext context) { var exception = context.Exception; Console.WriteLine($"Message : {exception.Message}\nStackTrace : {exception.StackTrace}"); if (exception.GetType().IsSubclassOf(typeof(CustomException))) { var customException = (CustomException)exception; context.Result = customException.Code == ErrorCode.NotModifiedException ? ApiResponder.RespondStatusCode(HttpStatusCode.NotModified) : ApiResponder.RespondHandledError(exception.Message, ((CustomException)exception).Code); } else { context.Result = ApiResponder.RespondUnhandledError(exception.Message, ErrorCode.UnknownException); } }