public void Save()
  {
  //保存的文件
  FileStream fs = new FileStream("soldTickets.txt", FileMode.OpenOrCreate);
  StreamWriter sw = new StreamWriter(fs, Encoding.Default);
  for (int i = 0; i < cinema.SoldTickets.Count; i++)
  {
   //创建售出票对象
   Ticket ticket = cinema.SoldTickets[i];
   //票的类型
   string type = "";
   //票的折扣
   int discount = 0;
   //赠送者的名字
   string name = "";
   //用is判断属于哪个类，并根据类设置类型
   if (cinema.SoldTickets[i] is StudentTicket)
   {
   type = "stu";
   discount = ((StudentTicket)cinema.SoldTickets[i]).Discount;
   }
   else if (cinema.SoldTickets[i] is FreeTicket)
   {
   type = "free";
   name = ((FreeTicket)cinema.SoldTickets[i]).CustomerName;
   }
   else
   {
   type = "normal";
   }
   //将信息写入文本文件0.电影名1.场次2.座位号3.票价4.折扣5.类型6.赠送者
   string info = string.Format("{0}|{1}|{2}|{3}|{4}|{5}|{6}", cinema.SoldTickets[i].ScheduItem.Movie.MovieName, cinema.SoldTickets[i].ScheduItem.Time, cinema.SoldTickets[i].Seat.SeatNum, cinema.SoldTickets[i].Price, discount, type, name);
   sw.WriteLine(info);
  }
  sw.WriteLine("The End");
  sw.Close();
  fs.Close();
  MessageBox.Show("保存成功！");
  }

 public void LoadLis()
  {
  StreamReader reader = new StreamReader("soldTickets.txt", Encoding.Default);
  //一行一行的读取，先预读一行给while判断用
  string line = reader.ReadLine();
  //保存分割好的数据的数组
  string[] pv;
  Ticket ticket = null;
  //当是The End时结束读取
  while (line.Trim() != "The End")
  {
   pv = line.Split('|');
   //读取文本信息
   string index = pv[1];
   //创建票对象
   ticket = TicketUtil.CreateTicket(cinema.Schedule.Items[index], cinema.Seats[pv[2]], int.Parse(pv[4]), pv[6], pv[5]);
   //加入到售出票集合
   cinema.SoldTickets.Add(ticket);
   line = reader.ReadLine();
  }
  reader.Close();
  }