public void Director(string dir, List
     
       list){    DirectoryInfo d = new DirectoryInfo(dir);    FileInfo[] files = d.GetFiles();//文件    DirectoryInfo[] directs = d.GetDirectories();//文件夹    foreach (FileInfo f in files)    {        list.Add(f.Name);//添加文件名到列表中      }    //获取子文件夹内的文件列表，递归遍历      foreach (DirectoryInfo dd in directs)    {        Director(dd.FullName, list);    }}