c#利用HttpWebRequest获取网页源代码

c#利用HttpWebRequest获取网页源代码，搞了好几天终于解决了，直接获取网站编码进行数据读取，再也不用担心乱码了！

 命名空间:Using System.Net

        private static string GetUrlHtml(string url)
        {

            string strHtml = string.Empty;

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();//从Internet资源返回数据流

            if (response.CharacterSet.ToLower() == "gbk")
            {
                using (Stream respStream = response.GetResponseStream())//读取数据流
                {
                    using (StreamReader str = new StreamReader(respStream, Encoding.GetEncoding("gb2312")))//读取数据
                    {
                        strHtml = str.ReadToEnd();
                    }
                }
            }
            else
            {
                using (Stream respStream = response.GetResponseStream())//读取数据流
                {
                    using (StreamReader str = new StreamReader(respStream, Encoding.UTF8))//读取数据
                    {
                        strHtml = str.ReadToEnd();
                    }
                }
            }
            return strHtml;
        }