c#登录知乎

gistfile1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;

namespace FakeWeb
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public static CookieContainer CookieContainer { get; set; }

        private void button1_Click(object sender, EventArgs e)
        {
            new Action(delegate()
            {
                login();
                getMain();
                getDraft();
            }).BeginInvoke(null, null);
        }


        string getXSRF()
        {
            string retString = HttpGet("http://www.zhihu.com"); ;
            string xsrf = null;
            Regex regex = new Regex("<input type=\"hidden\" name=\"_xsrf\" value=\"(?<xsrf>.+?)\"/>");
            Match mc = regex.Match(retString);
            if (mc != null)
            {
                xsrf = mc.Groups["xsrf"].Value;
            }

            return xsrf;
        }

        bool login()
        {
            string xsrf = getXSRF();
            if (xsrf != null)
            {

                string postData = string.Format("_xsrf={0}&email=test%40gmail.com&password=123456",
                    xsrf);

                byte[] postDataBytes = Encoding.UTF8.GetBytes(postData);

                HttpWebRequest request = WebRequest.Create("http://www.zhihu.com/login") as HttpWebRequest;
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
                request.ContentLength = postDataBytes.Length;
                request.Headers.Add("x-requested-with", "XMLHttpRequest");
                request.AllowAutoRedirect = false;
                if (CookieContainer == null)
                {
                    CookieContainer = new CookieContainer();
                }
                request.CookieContainer = CookieContainer;

                Stream wStream = request.GetRequestStream();
                wStream.Write(postDataBytes, 0, postDataBytes.Length);
                wStream.Close();

                HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                Stream stream = response.GetResponseStream();
                StreamReader rs = new StreamReader(stream, Encoding.UTF8);
                string retString = rs.ReadToEnd();
                rs.Close();
                stream.Close();
            }
            return false;
        }

        string getMain()
        {
            return HttpGet("http://www.zhihu.com");
        }

        string getDraft()
        {
            return HttpGet("http://www.zhihu.com/draft");
        }

        private string HttpGet(string url)
        {
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "GET";
            request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
            request.CookieContainer = CookieContainer;
            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            Stream stream = response.GetResponseStream();

            StreamReader rs = new StreamReader(stream, Encoding.GetEncoding("utf-8"));
            string retString = rs.ReadToEnd();
            rs.Close();
            stream.Close();

            return retString;
        }

    }
}