C#设计模式——（创建型-抽象工厂设计模式）

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用户10053120

发布于 2022-10-08 16:15:10

2810

发布于 2022-10-08 16:15:10

文章被收录于专栏：C# 设计原则

一、应用场景

分别用简单工厂设计模式和工厂方法设计模式实现：创建不同品牌的键盘。

 #region  简单工厂
        public interface IKeyBoard
        {
            void ShowBrand();
        }
        public class DellKeyBoard : IKeyBoard
        {
            public void ShowBrand()
            {
                Console.WriteLine("我是戴尔键盘"); ;
            }
        }
        public class LenovoKeyBoard : IKeyBoard
        {
            public void ShowBrand()
            {
                Console.WriteLine("我是联想键盘");
            }
        }
        public class HPKeyBoard : IKeyBoard
        {
            public void ShowBrand()
            {
                Console.WriteLine("我是惠普键盘");
            }
        }
        public class KeyBoardFactory
        {
            public static IKeyBoard GetKeyBoard(string brand)
            {
                IKeyBoard kb = null;
                switch (brand)
                {
                    case "Dell":
                        kb = new DellKeyBoard();
                        break;
                    case "Lenovo":
                        kb = new LenovoKeyBoard();
                        break;
                    case "HP":
                        kb = new HPKeyBoard();
                        break;
                    default:
                        break;
                }
                return kb;
            }
        }
         #endregion

        #region 工厂方法
        public interface IKeyBoardFactory
        {
            IKeyBoard GetKeyBoard();
        }
        public class DellBoardFactory : IKeyBoardFactory
        {
            public IKeyBoard GetKeyBoard()
            {
                return new DellKeyBoard();
            }
        }
        public class LenovoBoardFactory : IKeyBoardFactory
        {
            public IKeyBoard GetKeyBoard()
            {
                return new LenovoKeyBoard();
            }
        }
        public class HPBoardFactory : IKeyBoardFactory
        {
            public IKeyBoard GetKeyBoard()
            {
                return new HPKeyBoard();
            }
        }
        #endregion

二、定义

为了减少创建子类工厂的数量，不必给每一个产品分配一个工厂类，可以将产品进行分组，每组中的不同产品由同一个工厂类的不同方法进行创建。

抽象工厂代码如下：

        #region 抽象工厂
        //如果要添加鼠标、显示屏等产品
        public interface IMouse
        {
            void ShowMouseBrand();
        }
        public class DellMouse : IMouse
        {
            public void ShowMouseBrand()
            {
                Console.WriteLine("戴尔鼠标"); ;
            }
        }
        public class HPMouse : IMouse
        {
            public void ShowMouseBrand()
            {
                Console.WriteLine("惠普鼠标"); ;
            }
        }
        public interface AbstractFactory
        {
            IKeyBoard GetKeyBoard();
            IMouse GetMouse();
        }
        public class DellFactory : AbstractFactory
        {
            public IKeyBoard GetKeyBoard()
            {
                return new DellKeyBoard();
            }

            public IMouse GetMouse()
            {
                return new DellMouse();
            }
        }
        public class HPFactory : AbstractFactory
        {
            public IKeyBoard GetKeyBoard()
            {
               return new  HPKeyBoard();
            }

            public IMouse GetMouse()
            {
                return new HPMouse();
            }
        }
        #endregion

三、三种模式的对比