设计这个项目的一种方式

简单工厂设计模式：核心：根据用户的输入创建对象赋值给父类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 简单工厂设计模式
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入你想要的笔记本品牌");
            string s = Console.ReadLine();
            NoteBook nb = GetNoteBook(s);
            nb.SayHello();
            Console.ReadKey();

        }
        /// <summary>
        /// 简单工厂的核心：根据用户的输入创建对象赋值给父类
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static NoteBook GetNoteBook(string s)
        {
            NoteBook nb = null;
            switch (s)
            {
                case "Lenovo":
                    nb = new Lenovo();
                    break;
                case "IBM":
                    nb = new IBM();
                    break;
                case "Acer":
                    nb = new Acer();
                    break;
            }



            return nb;
        }
    }
    public abstract class NoteBook
    {
        public abstract void SayHello();

    }
    public class Lenovo : NoteBook
    {
        public override void SayHello()
        {
            Console.WriteLine("我是联想");
        }
    }
    public class IBM : NoteBook
    {
        public override void SayHello()
        {
            Console.WriteLine("我是IBM");
        }
    }
    public class Acer : NoteBook
    {
        public override void SayHello()
        {
            Console.WriteLine("我是Acer");
        }
    }
}