如何在Windows 8 metro风格的应用程序中获得网络响应？

Question

我正在创建一个Windows 8 Metro应用程序来获取Facebook联系人。在Windows 7中创建一个正常的Windows应用程序接受WebClient，

private WebClient wc = new WebClient(); 
string jsonResponse = wc.DownloadString("https://graph.facebook.com/" + ID); 
FacebookUser User = JsonConvert.DeserializeObject<FacebookUser>(jsonResponse); 

但是这并不在我的Windows 8 Metro应用工作

于是，我开始使用HTTPRequest和HTTPResponse

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 
request.Method = "GET"; 

我不知道如何获得响应（Facebook联系人列表）作为JSON。

任何人都可以帮助我吗？

Answer 1

使用System.Net.Http.HttpClient：

HttpClient client = new HttpClient(); 
client.MaxResponseContentBufferSize = 256000; 
HttpResponseMessage response = await client.GetAsync(address); 
response.EnsureSuccessStatusCode(); 
String jsonResponse = await response.Content.ReadAsStringAsync(); 
FacebookUser User = JsonConvert.DeserializeObject<FacebookUser>(jsonResponse); 

Answer 2

感谢每个人，我创建的方法，

public async void PerformHttpGet(string url,out string responseText) 
    { 
     int respCode = 0; 
     try 
     { 
      // used to build entire input 
      StringBuilder sb = new StringBuilder(); 

      // used on each read operation 
      byte[] buf = new byte[8192]; 

      // prepare the web page we will be asking for 
      HttpClient searchClient; 
      searchClient = new HttpClient(); 
      searchClient.MaxResponseContentBufferSize = 256000; 
      HttpResponseMessage response = await searchClient.GetAsync(url); 
      response.EnsureSuccessStatusCode(); 
      responseText = await response.Content.ReadAsStringAsync(); 
     } 
     catch (WebException e) 
     { 
      string text = string.Empty; 
      string outRespType = string.Empty; 
      if (e.Response != null) 
      { 
       using (WebResponse response = e.Response) 
       { 
        outRespType = response.ContentType; 
        HttpWebResponse exceptionResponse = (HttpWebResponse)response; 
        respCode = (int)exceptionResponse.StatusCode; 

        using (System.IO.Stream data = response.GetResponseStream()) 
        { 
         text = new System.IO.StreamReader(data).ReadToEnd(); 
        }; 
       }; 
      } 
      throw e; 
     } 
     catch (Exception ex) 
     { 
      throw ex; 
     } 
    }