public string Add() { var u = new user_merchant { id = Guid.NewGuid().ToString(), name = "cys", age = 26 }; var ue = new user_extend { id = Guid.NewGuid().ToString(), user_id = u.id, extend_info = "this is extend_info" }; _userRepository.Add(u); _userExtendRepository.Add(ue); _unitOfWork.SaveChange(); return("ok"); }