// 调用事件函数
public void OnDataChange(object sender, CreateOrderEventArgs args)
{
if (CreateOrder != null)
{
CreateOrder(this, args);
}
}
public void CreateOrder(object sender, CreateOrderEventArgs args)
{
Order order = new Order(args.ID, args.Customer, args.Items);
// 更新窗体控件
if (orders.Contains(order))
{
MessageBox.Show($"Add Order Error: Order with id {order.OrderId} already exists!");
}
os.AddOrder(order);
}