windows phone 8.1教务在线客户端（后续）

经过了一番折腾，这个wp教务在线算是告一段落了，其实原理很简单，就是post方式访问登陆页面返回cookie，然后带着这个cookie用get方式继续访问你想要访问并取回内容的页面，而且httpclient会默认保存cookie的，这个关键我一开始就没搞清，以至于走了弯路，，

ok，这个项目我只是登陆并且获取了我想要的html内容，至于解析html，可以用正则表达式，等以后有时间再研究吧

下面是源码：

 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 Windows.Web.Http;
 namespace App
 {
     public sealed partial class MainPage : Page
     {
         public MainPage()
         {
             this.InitializeComponent();

             this.NavigationCacheMode = NavigationCacheMode.Required;
         }

         protected override void OnNavigatedTo(NavigationEventArgs e)
         {
         }
         //点击登陆按钮
         private async void button_Click(object sender, RoutedEventArgs e)
         {
             //这个uri是抓包获得的,就是那个带有post请求的uri
             var uri = "xxx";
             var values = new List<KeyValuePair<string, string>>();
               //这个键值对也是抓包获得的，就是你的用户名和密码填上
             values.Add(new KeyValuePair<string, string>("自己的用户名", "xxxxx"));
             values.Add(new KeyValuePair<string, string>("自己的密码", "xxxxxx"));
             string response = await App.httpClientHelper.Post(new Uri(uri), values);
             //string responsetext = await response.Content.ReadAsStringAsync();
              //这个uri是你想获得返回内容的uri
             var _uri = "你想访问的uri";
             string _response = await App.httpClientHelper.Get(new Uri(_uri));
             Frame.Navigate(typeof(BlankPage1), _response);
         }
     }
 }

<Page
    x:Class="App.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:App"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid>
        <Button x:Name="button" Content="Login" Click="button_Click" HorizontalAlignment="Left" Margin="232,292,0,0" VerticalAlignment="Top"/>

        <TextBox x:Name="textBox1" HorizontalAlignment="Left" Margin="201,138,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Width="166"/>
        <TextBlock x:Name="textBlock" HorizontalAlignment="Left" Margin="43,138,0,0" TextWrapping="Wrap" Text="Name" FontSize="30" VerticalAlignment="Top" Height="39" Width="116"/>
        <TextBox x:Name="passwordBox" HorizontalAlignment="Left" Margin="201,218,0,0" VerticalAlignment="Top" Width="166"/>
        <TextBlock x:Name="textBlock1" HorizontalAlignment="Left" Margin="43,218,0,0" TextWrapping="Wrap" Text="Password" FontSize="22" VerticalAlignment="Top" Height="39" Width="93"/>

    </Grid>
</Page>

这个是个空页面，里面放着所返回的html源码:

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;

namespace App
{
    public sealed partial class BlankPage1 : Page
    {
        public BlankPage1()
        {
            this.InitializeComponent();
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            textBox.Text = e.Parameter.ToString();
        }
    }
}

<Page
    x:Class="App.BlankPage1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:App"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid>
        <TextBox x:Name="textBox" HorizontalAlignment="Left" Margin="55,69,0,0" TextWrapping="Wrap" VerticalAlignment="Top" RenderTransformOrigin="-3.716,-0.387" Height="217" Width="301" BorderThickness="0.1"/>

    </Grid>
</Page>

这是自定义的httpClienthelper类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.Web.Http;

namespace App
{
    public class HttpClientHelper
    {
        private HttpClient httpClient;

        public HttpClientHelper()
        {
            httpClient = new HttpClient();

        }

        public async Task<string> Post(Uri uri, IList<KeyValuePair<string, string>> postcontent)
        {
            string responseText = string.Empty;
            HttpResponseMessage response = await httpClient.PostAsync(uri, new HttpFormUrlEncodedContent(postcontent));
            responseText = await response.Content.ReadAsStringAsync();
            return responseText;
        }

        public async Task<string> Get(Uri uri)
        {
            string responseText = string.Empty;
            HttpResponseMessage response = await httpClient.GetAsync(uri);
            responseText = await response.Content.ReadAsStringAsync();
            return responseText;
        }
    }
}

一定别忘了在app.xaml.cs里实例化这个httpClientHelper实例：

public static HttpClientHelper httpClientHelper = new HttpClientHelper();

好了，这只是基本的原理展示，这是我学习windows phone的一个小尝试。