public static XElement ToXml(this DirectoryInfo Dir) 
{ 
XElement Root = new XElement("Dir", new XAttribute("Name", Dir.Name),new XAttribute("文件数",Dir.GetFiles().Count()), from SubDir in Dir.GetDirectories() select ToXml(SubDir), from F in Dir.GetFiles() select new XElement("文件", new List<XElement>{new XElement("文件名", F.Name),new XElement("扩展名",F.Extension)})); return Root; 
}应用的代码
XDocument Doc=new XDocument(); DirectoryInfo Dir=new DirectoryInfo("E://"); Doc.Add(LinqEach.ToXml(Dir)); string Url = Server.MapPath("/"); if (!Directory.Exists(Url)) { Directory.CreateDirectory(Url); } Doc.Save(Url + "AA.xml");