linq操作xml

 1   XDocument doc = XDocument.Parse(xmlfile);
 2   XElement root = doc.Root;
 3   XElement elements = root.Elements("permition").Where(u => u.Attribute("name").Value == permition).FirstOrDefault();
 4   if (elements == null)
 5   {
 6        return false;
 7   }
 8         XElement elem = (from u in elements.Descendants("subPermition")
 9                          where u.Attribute("name").Value == info
10                          select u).FirstOrDefault();
11         if (elem != null)
12         {
13             return true;
14         }
15         return false;