工厂模式之我见

 public interface IService
        {
            bool Summit();
        }
        public class NormalOrderService : IService
        {
            public bool Summit()
            {
                //TODO summit the normal order
                return false;
            }
        }
        public class ApplyOrderService : IService
        {
            void CreateOrder();
            public bool Summit()
            {
                CreateOrder();
                //TODO summit the apply order
                return false;
            }
        }
        public class BookOrderService : IService
        {
            bool CheckDate(DateTime time);
            public bool Summit()
            {
                if (CheckDate(DateTime.Now))
                {
                    //TODO Summit the bookOrder
                    return true;
                }
                else
                { 
                    return false;
                }
            }
        }

        public class ServiceFactory
        {
            public static  IService CreateService(string orderType)
            {
                switch (orderType)
                { 
                    case "Normal":
                        return new NormalOrderService();
                    case "Apply":
                        return new ApplyOrderService();
                    case "Book":
                        return new BookOrderService();
                    default:
                        return null;
                    }
            }
        }