private void GetById_Click(object sender, EventArgs e)
{
if (Id.Text == "")
{
MessageBox.Show("请输入完整信息!");
return;
}
order = orderService.GetById(int.Parse(Id.Text));
if (order == null)
{
MessageBox.Show("不存在满足要求的订单！");
return;
}
orders.Clear();
orders.Add(order);
showOrder();
}