asp.net io類遞歸顯示目錄信息

.aspx.cs代碼

private void page_load(object sender, system.eventargs e)
  {
   // 在此處放置用戶代碼以初始化頁面
   string strdirlist=request.querystring.get("dir");
   directoryinfo thisone=new directoryinfo(strdirlist);
   response.write("<pre>");
   listtreeshow(thisone,0);
   response.write("</pre>");
  }
  private void listtreeshow(directoryinfo thedir,int nlevel){
   directoryinfo[] subdirectories=thedir.getdirectories();
   for(int i=0;i<subdirectories.length;i++){
    response.write(nlevel);
    response.write(subdirectories[i].name+"/r/n");
    listtreeshow(subdirectories[i],nlevel+1);
   }
      }