.NETMVC4用HttpClient后台post请求webapi

视图控制器后台代码

public ActionResult Index()
        {
            var requestJson = JsonConvert.SerializeObject("[{'CityId':18,'CityName':'西安','ProvinceId':27,'CityOrder':1},{'CityId':53,'CityName':'广州','ProvinceId':27,'CityOrder':1}]");
            HttpContent httpCOntent= new StringContent(requestJson);
            httpContent.Headers.COntentType= new MediaTypeHeaderValue("application/json");
            var httpClient = new HttpClient();
            var respOnseJson= httpClient.PostAsync("http://localhost:6972/api/test/Post/", httpContent)
                .Result.Content.ReadAsStringAsync().Result;

            ViewBag.s = responseJson;
            return View();
        }

 // POST api/values
        public HttpResponseMessage Post([FromBody]string value)
        {
            return Request.CreateResponse(HttpStatusCode.OK, value);
        }