自己修改的一个WebRequest+代理+POST登录

public static void ProxySetting(WebRequest request)
          {
              WebProxy proxy = WebProxy.GetDefaultProxy();//获取IE缺省设置
              //如果缺省设置为空，则有可能是根本不需要代理服务器，如果此时配置文件中也未配置则认为不需Proxy
              if (proxy.Address == null)
                  proxy.Address = new Uri("××××××:8080");//按配置文件创建Proxy 地置
              if (proxy.Address != null)//如果地址为空，则不需要代理服务器
              {
                  proxy.Credentials = new NetworkCredential("test123","123456");//从配置封装参数中创建
                  request.Proxy = proxy;//赋予 request.Proxy
              }
          }

          public static string GetHtmlOne(string url)
          {
              url = url.Replace("&", "&");

              string indata = "userid=name&passwd=password&SESSION_TIMEOUT=40";
              string outdata = "";

              CookieContainer myCookieContainer = new CookieContainer();
              //新建一个CookieContainer来存放Cookie集合
              HttpWebRequest myHttpWebRequest;

              myHttpWebRequest = (HttpWebRequest)WebRequest.Create("http:// www.12355.com/logincheck.aspx");
              //新建一个HttpWebRequest
              myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
              myHttpWebRequest.ContentLength = indata.Length;
              myHttpWebRequest.Method = "POST";
              ProxySetting(myHttpWebRequest);
              myHttpWebRequest.CookieContainer = myCookieContainer;
              //设置HttpWebRequest的CookieContainer为刚才建立的那个myCookieContainer
              Stream myRequestStream = myHttpWebRequest.GetRequestStream();
              StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
              myStreamWriter.Write(indata);
              //把数据写入HttpWebRequest的Request流
              myStreamWriter.Close();
              myRequestStream.Close();
              //关闭打开对象
              HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
              //新建一个HttpWebResponse
              myHttpWebResponse.Cookies = myCookieContainer.GetCookies(myHttpWebRequest.RequestUri);
              //获取一个包含url的Cookie集合的CookieCollection
              Stream myResponseStream = myHttpWebResponse.GetResponseStream();
              StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("gb2312"));
              outdata = myStreamReader.ReadToEnd();
              //把数据从HttpWebResponse的Response流中读出
              myStreamReader.Close();
              myResponseStream.Close();
              //显示"登录"

              //拿到了Cookie，再进行请求就能直接读取到登录后的内容了
              myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
              ProxySetting(myHttpWebRequest);//设置代理访问的权限。
              myHttpWebRequest.CookieContainer = myCookieContainer;//*
              //刚才那个CookieContainer已经存有了Cookie,把它附加到HttpWebRequest中则能直接通过验证
              myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
              myHttpWebResponse.Cookies = myCookieContainer.GetCookies(myHttpWebRequest.RequestUri);
              myResponseStream = myHttpWebResponse.GetResponseStream();
              myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("gb2312"));
              outdata = myStreamReader.ReadToEnd();
              myStreamReader.Close();
              myResponseStream.Close();
              return outdata;
              //再次显示"登录"
              //如果把*行注释调，就显示"没有登录"

          }