C#带cookie模拟登录百度

 #region 同步通过POST方式发送数据
        /// <summary>
        /// 通过POST方式发送数据
        /// </summary>
        /// <param name="Url">url</param>
        /// <param name="postDataStr">Post数据</param>
        /// <param name="cookie">Cookie容器</param>
        /// <returns></returns>
        public string SendDataByPost(string Url, string postDataStr, ref CookieContainer cookie)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            if (cookie.Count == 0)
            {
                request.CookieContainer = new CookieContainer();
                cookie = request.CookieContainer;
            }
            else
            {
                request.CookieContainer = cookie;
            }

            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = postDataStr.Length;
            Stream myRequestStream = request.GetRequestStream();
            StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
            myStreamWriter.Write(postDataStr);
            myStreamWriter.Close();

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            string retString = myStreamReader.ReadToEnd();
            myStreamReader.Close();
            myResponseStream.Close();

            return retString;
        }
        #endregion

        #region 同步通过GET方式发送数据
        /// <summary>
        /// 通过GET方式发送数据
        /// </summary>
        /// <param name="Url">url</param>
        /// <param name="postDataStr">GET数据</param>
        /// <param name="cookie">GET容器</param>
        /// <returns></returns>
        public string SendDataByGET(string Url, string postDataStr, ref CookieContainer cookie)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);
            if (cookie.Count == 0)
            {
                request.CookieContainer = new CookieContainer();
                cookie = request.CookieContainer;
            }
            else
            {
                request.CookieContainer = cookie;
            }

            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            string retString = myStreamReader.ReadToEnd();
            myStreamReader.Close();
            myResponseStream.Close();

            return retString;
        }
        #endregion

        private void button1_Click(object sender, EventArgs e)
        {
            string cookie = "BDUSS=xmTWI5bnNvVWRXUxxxxxxxxxMH42ckg1ak9VQm9zcG01N2xnSG94aGRZQVFBQUFBJCQAAAAAAAAAAAEAAACEh61i0~3B-rWl1dDN-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAOg58FfoOfBXa2; BAIDUID=210F65A76356B6D480719A1A084D7D69:FG=1; PSTM=1476282093; BIDUPSID=9DDCF3D1EC83456525A2B69179CFA1D6; MCITY=-176%3A; PSINO=6; H_PS_PSSID=1465_21450_21108_21454_21394_21377_21192_21339; PHPSESSID=9c8cjtnb4l0210c62audgq64d4; Hm_lvt_4010fd5075fcfe46a16ec4cb65e02f04=1476059186,1478592650; Hm_lpvt_4010fd5075fcfe46a16ec4cb65e02f04=1478592650";
            
            CookieContainer cc = new CookieContainer();
            string url = "http://i.baidu.com/";

            cc.SetCookies(new System.Uri(url), cookie);

            string content = SendDataByGET(url, "", ref cc);
            
            Console.WriteLine(content);
            Console.ReadLine();
        }