Question

HttpClient client = new HttpClient();
            client.BaseAddress = uri;
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

HttpResponseMessage response = client.PostAsJsonAsync(route, requestResource).Result;

无法使用Xamarin PCL并导致此错误：

ex = {System.TypeInitializationException: The type initializer for 'System.Net.Http.FormattingUtilities' threw an exception. ---> System.NotImplementedException: The method or operation is not implemented.
  at System.Runtime.Serialization.XsdDataContractExporte...

Answer 1

说实话，我没有使用过这种方法，但是没有实现它没有太多关于它的事情。

你可以这样发帖

var request = new HttpRequestMessage(HttpMethod.Post, route);
var hc = new StringContent(requestResource); // requestResource should be a string
hc.Headers.ContentType = new MediaTypeHeaderValue("application/json);
request.Content = hc;
var response = await httpClient.SendAsync(request);

Answer 2

通常，在未实现请求的方法或操作时抛出异常。如果您正在调用的方法已经实现，请与API的开发人员联系。

Answer 3

尝试更新Visual Studio。那对我有用。

System.Net.Http.Formating的PostAsJsonAsync在Xamarin PCL上抛出System.NotImplementedException

3 个答案: