Windows phone8.1教务在线客户端

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Collections.Specialized;
using System.Text;
using System.Xml.Linq;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();

            this.NavigationCacheMode = NavigationCacheMode.Required;
        }
        private async void button_Click(object sender, RoutedEventArgs e)
        {
            //这句postdata的拼写可能有错误，考虑用键值对的方式
            string loginstr = "j_username=" + textBox1.Text + "&j_password=" + passwordBox.ToString();

            CookieContainer cookie = await GetCookie(loginstr,"http://60.18.131.131:11080/newacademic/common/security/login.jsp");
            string content = await GetContent(cookie, "http://60.18.131.131:11080/newacademic/frameset.jsp");
            Frame.Navigate(typeof(BlankPage1), content);
            textBox2.Text = content;
        }

        public async Task<CookieContainer> GetCookie (string postString,string postUrl)
        {
            CookieContainer cookie = new CookieContainer();
            HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(postUrl);
            //下面这个请求头的信息不知如何改进啊,反正有什么我就把它添上了
            httpRequest.CookieContainer = cookie;//设置cookie
            httpRequest.Method = "POST";//POST提交
            httpRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
            httpRequest.ContentType = "application/x-www-form-urlencoded";
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(postString);
            Stream stream = await httpRequest.GetRequestStreamAsync();
            stream.Write(bytes, 0, bytes.Length);//以上是post数据的写入，不知还有什么疏漏之处          
            HttpWebResponse httpResponse =(HttpWebResponse)await httpRequest.GetResponseAsync();
            return cookie;
        }

        public async Task<string> GetContent(CookieContainer cookie,string url)
        {
            string content;
            HttpWebRequest httpRequest = (HttpWebRequest)HttpWebRequest.Create(url);
            httpRequest.CookieContainer = cookie;
            httpRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
            httpRequest.ContentType = "application/x-www-form-urlencoded";
            httpRequest.Method = "GET";
            HttpWebResponse httpResponse = (HttpWebResponse)await httpRequest.GetResponseAsync();
            using(Stream responseStream = httpResponse.GetResponseStream())
            {
                using (StreamReader sr = new StreamReader(responseStream,System.Text.Encoding.UTF8))
                {
                    content = sr.ReadToEnd();
                }
            }
            return content;
        }
    }
}