asp.net遍历文件夹和文件

            DirectoryInfo dir = new DirectoryInfo(Path);          
            foreach (DirectoryInfo df in dir.GetDirectories())
            {
if (df.ToString().Length != 18)
                {
                    StreamWriter sw = new StreamWriter(@"Paht",true,Encoding.UTF8);
                    sw.WriteLine(Path+":"+df);
                    sw.Close();
                }
                DirectoryInfo fdir = new DirectoryInfo(Path+df+@"\");
// int i = 0;
if (!Directory.Exists(fdir.ToString()))
                {
                    StreamWriter sw = new StreamWriter(@"Path", true, Encoding.UTF8);
                    sw.WriteLine(Path + ":" + df);
                    sw.Close();                
                }
                foreach (FileInfo dChild in fdir.GetFiles("*.swf"))
                {
// i++;                   
                }
         }