无法从PCL中获取xcrin的wcf服务的响应体

Question

我正在尝试在PCL中为xamarin安卓在视觉工作室中使用wcf服务，在调用服务我想得到json响应体。但在这里我不会得到任何响应体，除了200状态。可以请任何人帮助我。任何人感谢建议和帮助。下面是使用的代码。

的Class1.cs

 namespace XamarinServiceCall
{
    public sealed class Class1 : IRestService
    {

        public async Task<string> GetData(UserModel model)
        {
            using (var client = new HttpClient())
            {
                var content = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string,string>("domainName",model.domainName ),
            new KeyValuePair<string, string>("userName", model.userName),
            new KeyValuePair<string, string>("password", model.password),
            new KeyValuePair<string, string>("loginFrom", model.loginFrom),
        });
var result = await client.PostAsync("http://xamarin-rest-service/LoginService/ValidateLogin", content);

            return await result.Content.ReadAsStringAsync();


            }
        }
    }
} 

MAinActivity.cs

namespace ServiceSample
{
    [Activity(Label = "LayoutSample", MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity
    {
            protected async override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            // Get our button from the layout resource,
            // and attach an event to it
            Button button = FindViewById<Button>(Resource.Id.MyButton);

            XamarinServiceCall.Class1 serviceClass = new XamarinServiceCall.Class1();
           var model = new XamarinServiceCall.UserModel { domainName = "domainname" ,userName = "username" , password = "password" ,loginFrom = "App" };

            var result = await serviceClass.GetData(model);
            button.Text = "get call says: " + result;

        }
    }
}

下图显示了调试结果变量

的数据

以下是我需要发送的内容（URL）并获取响应json body

http://xamarin-rest-service/LoginService/ValidateLogin?domainName = domainname＆amp; userName = username＆amp; password = password＆amp; loginFrom = App

回应邮递员：

“DomainType”：2，“FirstName”：dallia，“状态”：2，“UserId”：3

感谢任何帮助或建议。请帮助我，我对c＃和xamarin很新。