记录一下.

/// <summary>
        /// 通过URI读取指向地址的HTML代码
        /// </summary>
        /// <param name="url">URI地址(例如:http://www.wnweixiu.com)</param>
        /// <returns></returns>
        protected string GetHTMLCode(string url)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            //使用Cookie设置AllowAutoRedirect属性为false,是解决“尝试自动重定向的次数太多。”的核心
            request.CookieContainer = new CookieContainer();
            request.AllowAutoRedirect = false;
            WebResponse response = (WebResponse)request.GetResponse();
            Stream sm = response.GetResponseStream();
            System.IO.StreamReader streamReader = new System.IO.StreamReader(sm);
            //将流转换为字符串
            string html = streamReader.ReadToEnd();
            streamReader.Close();
            return html;
        }