webrequest请求问题！！急！~！！

Question

我想用httpwebrequest代理（proxy属性）来请求 百度的页面 具体是在百度首页中收入关键词后 出来的那个页面（图）代码如下：
try
                            {
                                WebProxy wp = new WebProxy();
                                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(site[i]));
                                wp.Address = new Uri("http://" + dr2[0].ToString().Trim());
                                request.Proxy = wp;
                                //request.Credentials = CredentialCache.DefaultCredentials;
                                //request.GetResponse();
                                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);
                                reader.Close();
                                response.Close();                            }每次运行都是出现 【远程服务器返回错误：（404）未找到】....我快崩溃了 怎么解决呀 我代码哪里错了

Answer 1

            WebProxy wp = new WebProxy("代理网址或代理IP", 80);
            wp.Credentials=new NetworkCredential("username","password");要有具体的设置,或使用默认设置。
            //当前模拟用户的 Internet Explorer 设置中配置的代理
            request.Proxy = WebRequest.GetSystemWebProxy();
          request.Credentials=new NetworkCredential("username","password");

Answer 2

private const string _addressBookUrl = "http://bjapp2.mail.tom.com/cgi/ldvcapp?funcid=address&sid={0}&showlist=all&listnum=0";
        private int _affect = 1;
        private const string _loginPage = "http://login.mail.tom.com/cgi/login?style=0&verifycookie=0&type=0&url=http://bjweb.mail.tom.com/cgi/login2";
        private string _pwd = string.Empty;
        private const string _userAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        private string _username = string.Empty;
        private CookieContainer cct = null;
        private string sid = string.Empty;        /// <summary>
        /// 检查登陆
        /// </summary>
        public void Login()
        {
            string s = "user=" + HttpUtility.UrlEncode(this._username) + "&pass=" + HttpUtility.UrlEncode(this._pwd);
            byte[] bytes = new ASCIIEncoding().GetBytes(s);
            this.cct = new CookieContainer();
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://login.mail.tom.com/cgi/login?style=0&verifycookie=0&type=0&url=http://bjweb.mail.tom.com/cgi/login2");
            request.CookieContainer = this.cct;
            request.AllowAutoRedirect = false;
            request.Method = "post";
            request.UserAgent = _userAgent;
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = bytes.Length;
            request.Credentials = CredentialCache.DefaultNetworkCredentials;
            Stream requestStream = request.GetRequestStream();
            requestStream.Write(bytes, 0, bytes.Length);
            requestStream.Close();
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            CookieCollection cookies = request.CookieContainer.GetCookies(new Uri("http://login.mail.tom.com/"));
            if (cookies["Coremail"] != null)
            {
                string[] strArray = cookies["Coremail"].Value.Split(new char[] { '%' });
                this.sid = strArray[1];
            }
            else
            {
                this._affect = -1;
            }
            response.Close();
        }        /// <summary>
        /// -1代表用户名或密码错误或网络出错,0代表通讯录中没有数据,1代表正常取出
        /// </summary>
        public int Affect
        {
            get
            {
                return this._affect;
            }
        }