public async Task <IActionResult> Post([FromBody] RetailerViewModel retailerVm)
        {
            if (retailerVm == null)
            {
                return(BadRequest());
            }

            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            var newItem = Mapper.Map <Retailer>(retailerVm);

            _retailerRepository.SetPinyin(newItem);
            newItem.SetCreation(UserName);
            _retailerRepository.Add(newItem);
            if (!await UnitOfWork.SaveAsync())
            {
                return(StatusCode(500, "保存时出错"));
            }

            var vm = Mapper.Map <RetailerViewModel>(newItem);

            return(CreatedAtRoute("GetRetailer", new { id = vm.Id }, vm));
        }