解析Json方法POST windows phone app 8.1

Question

我使用HttpClient进行了方法GET，但我不知道如何使用param（id）或POST方法获取数据，任何人都可以帮助我。 这是我之前使用的HttpClient的代码GET，希望方法POST同样如此。

public async void getreponse()
    {
        var postrequest = (HttpWebRequest)WebRequest.Create("http://210.86.239.156/PIXA/app_truyenhay/api/list_story");
        postrequest.Method = "GET";
        postrequest.CookieContainer = new CookieContainer();
        HttpWebResponse postresponse = (HttpWebResponse)await postrequest.GetResponseAsync();
        string response = String.Empty;
        if (postresponse != null)
        {
            var postResponseStream = postresponse.GetResponseStream();
            var postStreamReader = new StreamReader(postResponseStream);

            response = await postStreamReader.ReadToEndAsync();
        }
        ListStory liststory = Newtonsoft.Json.JsonConvert.DeserializeObject<ListStory>(response);
        /*foreach (var blog in liststory.items)
            blog.storyImage = "http://a.wattpad.com/cover/30539421-256-k910647.jpg";
        //LBTruyen.ItemsSource = liststory.items;                        */
    }