/// 
        /// 默认的编码:UTF8        /// 
            public Encoding _encoding = Encoding.UTF8;        /// 
        /// 返回Html        /// 
        public string returnHtmlData = "";        /// 
        /// 返回错误信息        /// 
        public string returnErrorData = "";        private string _url;               /// 
        /// 生成html        /// 
        private void GetHttpRequestString()        {            try            {                System.Net.WebRequest wReq = System.Net.WebRequest.Create(_url);                System.Net.WebResponse wResp = wReq.GetResponse();                System.IO.Stream respStream = wResp.GetResponseStream();                System.IO.StreamReader reader = new System.IO.StreamReader(respStream, _encoding);                returnHtmlData = reader.ReadToEnd();            }            catch (System.Exception ex)            {                returnErrorData += ex.Message;            }        }