关于win8 metro应用开发 实现登录功能的问题

[doris199363]

我的Metro客户端post用户名和密码到服务器端的代码如下：

private async void  Button_Click_1(object sender, RoutedEventArgs e)
        {
            //Create an Http client and set the headers we want 
            Uri theUri = new Uri("http://localhost/login.php"); 
            HttpClient aClient = new HttpClient(); 
            aClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); 
            aClient.DefaultRequestHeaders.Add("X-ZUMO-INSTALLATION-ID", "8bc6aea9-864a-44fc-9b4b-87ec64e123bd"); 
            aClient.DefaultRequestHeaders.Add("X-ZUMO-APPLICATION", "OabcWgaGVdIXpqwbMTdBQcxyrOpeXa20"); 
            aClient.DefaultRequestHeaders.Host = theUri.Host;
            LIUser User = new LIUser();
            User.Uname = username.Text.ToString();
            User.psw = psw.Password.ToString();

            //Create a Json Serializer for our type 
            DataContractJsonSerializer jsonSer = new DataContractJsonSerializer(typeof(LIUser));

            // use the serializer to write the object to a MemoryStream 
            MemoryStream ms = new MemoryStream();
            jsonSer.WriteObject(ms, User);
            ms.Position = 0;

            //use a Stream reader to construct the StringContent (Json) 
            StreamReader sr = new StreamReader(ms);
            StringContent theContent = new StringContent(sr.ReadToEnd(), System.Text.Encoding.UTF8, "application/json");

            //Post the data 
            HttpResponseMessage aResponse = await aClient.PostAsync(theUri, theContent);
            string responseBody = await aResponse.Content.ReadAsStringAsync();
            if (responseBody == "OK")
            {
                Windows.UI.Popups.MessageDialog dialog = new Windows.UI.Popups.MessageDialog("登录成功");
                await dialog.ShowAsync();
            }
            else
            {
                Windows.UI.Popups.MessageDialog dialog = new Windows.UI.Popups.MessageDialog("用户名或密码错误！请重新输入");
                await dialog.ShowAsync();
            }
            

        }

请大家帮我看看以上代码能不能成功post数据到服务器端，另外服务器端的PHP代码又该怎么写来接收并解析登录信息？