c# - 无法加载类型 'System.Net.Http.FormattingUtilities'

Question

在 Xamarin.Android 项目的 PCL 项目中，当我执行 httpClient.PostAsJsonAsync() 或 httpClient.PutAsJsonAsync() 时出现以下错误>.

错误:

System.TypeLoadException:无法从程序集“System.Net.Http.Formatting，Version=5.2.3.0，Culture=neutral，PublicKeyToken=31bf3856ad364e35”加载类型“System.Net.Http.FormattingUtilities”。

此代码中出现此错误:

public async Task<User> CreateUser(string name, string email, string password)
    {
        try
        {
            User user = new User();
            user.Name = name;
            user.Email = email;
            user.Password = password;

            var response = await _client.PostAsJsonAsync("myUrl", user); // error on this line
            string content = await response.Content.ReadAsStringAsync();

            return string.IsNullOrEmpty(content) ? new User() :
                JsonConvert.DeserializeObject<User>(content);
        }
        catch (JsonReaderException ex)
        {
            throw ex;
        }
        catch (WebException ex)
        {
            throw ex;
        }
        catch (Exception ex)
        {
            throw ex; // ex is null here
        }
}

Answer 1

我放弃了。

我把它改成:

string json = JsonConvert.SerializeObject(user);
var stringContent = new StringContent(json, Encoding.UTF8, "application/json");
var response = await _client.PostAsync(myUrl, stringContent);

现在可以了。