/// <summary>

        /// 获取网页源代码

        /// </summary>

        /// <param name="url"></param>

        /// <returns></returns>

        private string GetWebRequest(string url)

        {

            if (!url.StartsWith("http://"))

                return "";

            try

            {

                Uri uri = new Uri(url);

                WebRequest myReq = WebRequest.Create(uri);

                WebResponse result = myReq.GetResponse();

                Stream receviceStream = result.GetResponseStream();

                StreamReader readerOfStream = new StreamReader(receviceStream, Encoding.GetEncoding("utf-8"));

                string strHTML = readerOfStream.ReadToEnd();

                readerOfStream.Close();

                receviceStream.Close();

                result.Close();

                return strHTML;

            }

            catch (Exception ex)

            {

                return ex.Message;

            }

        }