try
 {
  //获取当前被点击座位标签的座位号(Text属性)
  string seatNum = ((Label)sender).Text.ToString();
  //赠送者名字
  string customerName = this.txtGiver.Text.ToString();
  //折扣
  int discount = 0;
  //票的类型
  string type = "";
  //如果学生票是选中的
  if (this.rdoStuTicket.Checked)
  {
  type = "StudentTicket";
  if (this.cboDiscount.Text == null)
  {
  MessageBox.Show("请输入折扣数！", "提示");
  return;
  }
  else
  {
  discount = int.Parse(this.cboDiscount.Text);
  }
  }
  //如果赠票是选中的
  else if (this.rdoGiveTicket.Checked)
  {
  if (string.IsNullOrEmpty(this.txtGiver.Text))
  {
  MessageBox.Show("请输入赠票者姓名！", "提示");
  return;
  }
  type = "FreeTicket";
  }
  //创建票 使用工具类的静态方法
  Ticket newTicket = TicketUtil.CreateTicket(cinema.Schedule.Items[key], cinema.Seats[seatNum], discount, customerName, type);
  //如果当前座位的颜色是黄色-待售出
  if (cinema.Seats[seatNum].Color == Color.Yellow)
  {
  //询问
  DialogResult result = MessageBox.Show("是否购买？", "提示", MessageBoxButtons.YesNo);
  if (result == DialogResult.Yes)
  {
  //重新计算票价
  newTicket.CalcPrice();
  //将票加入到已经售出票的集合
  cinema.SoldTickets.Add(newTicket);
  //更新座位颜色状态
  UpdateSeat();
  lblPreferentialPrice.Text = newTicket.Price.ToString();
  newTicket.Print();
  //使座位集合的颜色状态改变
  cinema.Seats[seatNum].Color = Color.Red;
  }
  }
  //如果是已经售出的票
  else
  {
  //显示当前售票信息
  foreach (Ticket ticket0 in cinema.SoldTickets)
  {
  //已售出票集合的座位号等于当前点击座位号 并且 选中的时间等于售出票的场次的时间 并且 售出票的场次计划中电影名字等于TreeView选中时间的父节点也就是电影名称
  if (ticket0.Seat.SeatNum == seatNum && ticket0.ScheduItem.Time == treeView1.SelectedNode.Text && ticket0.ScheduItem.Movie.MovieName == treeView1.SelectedNode.Parent.Text)
  {
  ticket0.Show();
  }
  }
  }
 
 }
 catch (Exception ex)
 {
  MessageBox.Show("请先选择场次！" + ex.Message);
 }

 //重置labels集合label的颜色
 foreach (string lkey in labels.Keys)
 {
  labels[lkey].BackColor = Color.Yellow;
 }
 //重置座位集合颜色
 foreach (string key in cinema.Seats.Keys)
 {
  cinema.Seats[key].Color = Color.Yellow;
 }
 //遍历售出票集合
 foreach (Ticket ticket in cinema.SoldTickets)
 {
  //如果场次一致，并且电影名字一致
  if (ticket.ScheduItem.Time == this.treeView1.SelectedNode.Text && ticket.ScheduItem.Movie.MovieName == this.lblName.Text)
  {
  //重新更改颜色
  labels[ticket.Seat.SeatNum].BackColor = Color.Red;
  cinema.Seats[ticket.Seat.SeatNum].Color = Color.Red;
  }
 }