private List<News> GetNews(string html)
        {
            StringReader s = new StringReader(html);
            XDocument loadedData = XDocument.Load("10.xml");
            XElement root = loadedData.Root;//获取根节点
            var data = from query in loadedData.Descendants("entry")
                       select new News
                       {
                           NewsId = (string)query.Element("id"),
                           NewsTitle = (string)query.Element("title"),
                           Summary = (string)query.Element("summary"),
                           AddTime = DateTime.Parse(query.Element("published").Value),
                           NewsUrl = query.Element("link").Attribute("href").Value,
                           DiggsNum = (int)query.Element("diggs"),
                           ViewNum = (int)query.Element("views"),
                           CommentNum = (int)query.Element("comments"),
                           Author = (string)query.Element("sourceName")
                       };
            int linr = data.Count<News>();
            List<News> l = data.ToList<News>();
            return l;
        }