model内的设置如下所示：

/// 
        /// 取得或设置邮编        /// 
        [RegularExpression(@"(^[1-9]\d{5}$)", ErrorMessage = "邮编不符合规范！")]        public string Zip        {            get            {                return _Zip;            }            set            {                if (_Zip != value)                {                    _Zip = string.IsNullOrEmpty(value) ? value : value.Trim();                    OnPropertyChanged("Zip");                }            }        }

/// 
        /// 添加人员        /// 
        /// 客户端人员对象        /// 
             [HttpPost]        public dynamic AddMember(MemberVO memberVO)        {            if (ModelState.IsValid)            {                var member = SaveMember(memberVO);                HttpResponseMessage httpResponseMessage = Request.CreateResponse(HttpStatusCode.Created, member.MemberToMemberVO(User, Database));                return httpResponseMessage;            }            Log(ModelState);            return Request.CreateResponse(HttpStatusCode.InternalServerError);        }

相当于服务器对客户端model的一种验证。model实例如在服务器端不符合要求则会报错。