问如何以xamarin形式调用同步web服务？

EN

public Webservice() { }
public Home GetHome()
{
    string strpost = "";
    var client = new System.Net.Http.HttpClient();
    client.BaseAddress = new Uri(" xyz ");
    var response = client.PostAsync(new Uri(" xyz "), str).Result;
    var result = JsonConvert.DeserializeObject<Home>(response.Content.ReadAsStringAsync().Result);
    Home home = new Home();
    if (!Equals(result, null))
    {
        home = result;
        return home;
    }
}