List<string> ss =new List<string>( Directory.GetFiles(path, "*.xls", SearchOption.AllDirectories));//得到文件
ss.Sort(delegate(string s1, string s2) { return new FileInfo(s2).CreationTime.CompareTo(new FileInfo(s1).CreationTime); });
List<string> ss =new List<string>( Directory.GetFiles(path, "*.xls", SearchOption.AllDirectories));//得到文件