Question

我正在尝试通过web api执行crud操作。所以我将客户json从客户端传递给web api action。

这是我从客户端传递到行动的json。

{"CustomerID":"James","CompanyName":"jame pvt","ContactName":"James","ContactTitle":"Sr Developer","Address":"Salt lake","Region":"sect-1","PostalCode":"700009","City":"kolinara","Country":"India","Phone":"033-8547-4789","Fax":"033-8547-4781"}

我的网络API动作如下所示

    [RoutePrefix("api/customer")]
    public class CustomerController : ApiController
    {
    [HttpPost, Route("AddCustomer")]
            public HttpResponseMessage PostCustomer(Customer customer)
            {
                customer = repository.Add(customer);
                var response = Request.CreateResponse<Customer>(HttpStatusCode.Created, customer);
                response.ReasonPhrase = "Customer successfully added";
                string uri = Url.Link("DefaultApi", new { customerID = customer.CustomerID });
                response.Headers.Location = new Uri(uri);
                return response;
            }
}

这样我尝试从winform apps

中调用来自httpclient的动作

private async void btnAdd_Click(object sender, EventArgs e)
        {
            Customer oCustomer = new Customer
            {
                CustomerID = "James",
                CompanyName = "James pvt",
                ContactName = "James",
                ContactTitle = "Sr Developer",
                Address = "Salt lake",
                Region = "sect-1",
                PostalCode = "700009",
                City = "Kolinara",
                Country = "India",
                Phone = "033-8547-4789",
                Fax = "033-8547-4781"
            };

            var fullAddress = "http://localhost:38762/api/customer/AddCustomer";

            try
            {
                using (var client = new HttpClient())
                {
                    var serializedCustomer = JsonConvert.SerializeObject(oCustomer);
                    var content = new StringContent(serializedCustomer, Encoding.UTF8, "application/json");

                    using (var response = client.PostAsync(fullAddress, content).Result)
                    {
                        if (response.IsSuccessStatusCode)
                        {
                            var customerJsonString = await response.Content.ReadAsStringAsync();
                            //_Customer = JsonConvert.DeserializeObject<IEnumerable<Customer>>(customerJsonString);
                        }
                        else
                        {
                            Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
                            var dict = JsonConvert.DeserializeObject<Dictionary<string, string>>(response.Content.ReadAsStringAsync().Result);
                            MessageBox.Show(dict["Message"]);
                        }
                    }
                }
            }
            catch (HttpRequestException ex)
            {
                // catch any exception here
            }
        }

这是我从小提琴手那里做同样的错误信息。错误消息是：

{＆＃34; Message＆＃34;：＆＃34;请求包含实体主体但没有Content-Type 头。推断的媒体类型＆＃39; application / octet-stream＆＃39;不是支持此资源。＆＃34;，＆＃34; ExceptionMessage＆＃34;：＆＃34;没有 MediaTypeFormatter可用于读取＆＃39;客户＆＃39; 来自媒体类型的内容＆＃39;应用程序/八位字节流＆＃39;＆＃34;＆＃34; ExceptionType＆＃34;：＆＃34; System.Net.Http.UnsupportedMediaTypeException＆＃34;＆＃34;堆栈跟踪＆＃34; ：＆＃34; 在System.Net.Http.HttpContentExtensions.ReadAsAsync [T]（HttpContent） content，Type type，IEnumerable 1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\r\n at System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content, Type type, IEnumerable 1格式化程序，IFormatterLogger formatterLogger，取消语音取消语句）\ r \ n at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync（HttpRequestMessage 请求，类型类型，IEnumerable`1格式化程序，IFormatterLogger formatterLogger，CancellationToken cancellationToken）＆＃34;}

现在请告诉我我的代码中出现错误的错误。

感谢

Answer 1

自然这个错误是因为没有将Content-Type设置为：application / json。我已经通过这种方式实现了我的代码。

HttpClient client = new HttpClient();
client.BaseAddress = new Uri("http://localhost:38762/api/customer/AddCustome");
client.DefaultRequestHeaders
  .Accept
  .Add(new MediaTypeWithQualityHeaderValue("application/json"));

 HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post,"relativeAddress");
 var serializedCustomer = JsonConvert.SerializeObject(oCustomer);
                var content = new StringContent(serializedCustomer, Encoding.UTF8, "application/json");
  request.Content = content;
  client.SendAsync(request)
  .ContinueWith(responseTask =>
  {
      Console.WriteLine("Response: {0}", responseTask.Result);
  });

WebAPI问题：用于将客户对象从客户端传递到操作

我的网络API动作如下所示

这样我尝试从winform apps

1 个答案: