WebAPI问题：用于将客户对象从客户端传递到操作

Question

我试图通过web api执行粗鲁的操作。所以我把客户json从客户端传递到web api操作。

这是我从客户端传递给操作的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"}

    [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;
            }
}

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
            }
        }

这是我得到的错误信息，当我做同样的事情从小提琴手。

{“Message”：“请求包含实体正文，但没有内容类型标头。此资源不支持推断的媒体类型“application/octet stream”。”，“ExceptionMessage”：“没有MediaTypeFormatter可用于从媒体类型为“application/octet stream”的内容中读取“Customer”类型的对象。”，“ExceptionType”：“System.Net.Http.UnsupportedMediaTypeException”，“StackTrace”：“在System.Net.Http.HttpContentExtensions.ReadAsAsync[T]（HttpContent内容，类型，IEnumerable1格式化程序，IFormatterLogger格式化程序记录器，CancellationToken CancellationToken）\r\n在System.Net.Http.HttpContentExtensions.Readasync（HttpContent内容、类型、IEnumerable1格式化程序、IFormatterLogger格式化程序记录器、CancellationToken CancellationToken）\r\n在系统中。网状物Http。模型绑定。FormatterParameterBinding。ReadContentAsync（HttpRequestMessage请求，类型类型，IEnumerable`1格式化程序，IFormatterLoggerhtml" target="_blank">格式化程序记录器，CancellationToken CancellationToken）“}

现在请告诉我我的代码中有什么错误，我得到了错误。

谢啦

Answer 1

当然，这个错误是因为没有将内容类型设置为：application/json。我用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);
  });