C#获取网页内容

/// <summary>
    /// 请求访问类
    /// </summary>
    public class ServletMgr
    {
        /// <summary>
        /// 发送请求到servlet并得到返回结果
        /// </summary>
        /// <param name="strRomoteUrl">请求的Servlet</param>
        /// <param name="strErrorMsg">返回的错误描述，如果无错误，则返回空字符串</param>
        /// <returns>返回servlet处理后的结果</returns>
        public static CookieContainer severCookie = null;
        public static String getServletResult(String strRomoteUrl, String pincode, String mobile, String signcode, String ip, String ipdesc, Int32 fid, Int32 bid)
        {
            String strErrorMsg = "";
            String result = "";
            //创建请求对象
            //WebRequest request = WebRequest.Create(_url);
            //request.Credentials = new NetworkCredential("invaliduser", "invalidpassword");
            //创建响应对象
            //WebResponse response =request.GetResponse();
            try
            {
                //创建请求对象
                WebRequest request = WebRequest.Create(strRomoteUrl);
                //request.Credentials = new NetworkCredential("invaliduser", "invalidpassword");
                if (severCookie == null)
                {
                    severCookie = new CookieContainer();
                    ((HttpWebRequest)request).CookieContainer = severCookie;
                }
                else
                {
                    ((HttpWebRequest)request).CookieContainer = severCookie;
                }
                //创建响应对象
                WebResponse response = request.GetResponse();
                //成功解析 Uri
                //从服务器获取可读的流
                Stream ReceiveStream = response.GetResponseStream();
                Encoding encode = System.Text.Encoding.Default;
                StreamReader sr = new StreamReader(ReceiveStream, encode);
                Char[] read = new Char[256];
                Int32 count = sr.Read(read, 0, 256);
                while (count > 0)
                {
                    String str = new String(read, 0, count);
                    result = result + str;
                    count = sr.Read(read, 0, 256);
                }
            }
            catch (WebException WebExcp)
            {
                // 获取 WebException 状态码
                if (WebExcp.Status == WebExceptionStatus.ProtocolError) // 7 指示协议错误，因此 WebResonse 对象应该存在
                {
                    // 写出 WebResponse 协议状态
                    strErrorMsg = "检索 URI 时出错!详细错误：" + WebExcp.Message.ToString();
                    return "";
                }
                else
                {
                    strErrorMsg = WebExcp.Message.ToString();
                    return "";
                }
            }
            catch (UriFormatException UriExcp)
            {
                strErrorMsg = "已捕获 URIFormatException！详细错误：" + UriExcp.Message.ToString();
                return "";
            }
            catch (Exception exc)
            {
                strErrorMsg = exc.Message.ToString();
                return "";
            }
            return result;
        }
        public static String getServletResult(String strRomoteUrl)
        {
            String strErrorMsg = "";
            String result = "";
            //创建请求对象
            //WebRequest request = WebRequest.Create(_url);
            //request.Credentials = new NetworkCredential("invaliduser", "invalidpassword");
            //创建响应对象
            //WebResponse response =request.GetResponse();
            try
            {
                //创建请求对象
                WebRequest request = WebRequest.Create(strRomoteUrl);
                //request.Credentials = new NetworkCredential("invaliduser", "invalidpassword");
                if (severCookie == null)
                {
                    severCookie = new CookieContainer();
                    ((HttpWebRequest)request).CookieContainer = severCookie;
                }
                else
                {
                    ((HttpWebRequest)request).CookieContainer = severCookie;
                }
                //创建响应对象
                WebResponse response = request.GetResponse();
                //成功解析 Uri

                //从服务器获取可读的流
                Stream ReceiveStream = response.GetResponseStream();
                Encoding encode = System.Text.Encoding.Default;
                StreamReader sr = new StreamReader(ReceiveStream, encode);
                Char[] read = new Char[256];
                Int32 count = sr.Read(read, 0, 256);
                while (count > 0)
                {
                    String str = new String(read, 0, count);
                    result = result + str;
                    count = sr.Read(read, 0, 256);
                }
            }
            catch (WebException WebExcp)
            {
                // 获取 WebException 状态码
                if (WebExcp.Status == WebExceptionStatus.ProtocolError) // 7 指示协议错误，因此 WebResonse 对象应该存在
                {
                    // 写出 WebResponse 协议状态
                    strErrorMsg = "检索 URI 时出错!详细错误：" + WebExcp.Message.ToString();
                    return "";
                }
                else
                {
                    strErrorMsg = WebExcp.Message.ToString();
                    return "";
                }
            }
            catch (UriFormatException UriExcp)
            {
                strErrorMsg = "已捕获 URIFormatException！详细错误：" + UriExcp.Message.ToString();
                return "";
            }
            catch (Exception exc)
            {
                strErrorMsg = exc.Message.ToString();
                return "";
            }
            return result;
        }
        public static String UTF8ToGB(String utfinfo)
        {
            String gb2312info = String.Empty;
            Encoding utf8 = Encoding.UTF8; ;
            Encoding gb2312 = Encoding.GetEncoding("gb2312");
            Byte[] unicodebytes = utf8.GetBytes(utfinfo);

            byte[] asciibytes = Encoding.Convert(utf8, gb2312, unicodebytes);

            for (Int32 i = 0; i < asciibytes.Length; i++)
            {
                gb2312info += "%" + Convert.ToString(asciibytes[i], 16);
            }
            return gb2312info;
        }
    }