抽象工厂模式

抽象工厂模式：提供一个接口，让该接口负责创建一系列“相关或者相互依赖的对象”，无需指定它们具体的类。{创建型模式}

抽象工厂模式以一种倾斜的方式支持增加，可以很容易的增加产品族，但是不能为增加产品等级结构提供方便。[如下图，我们可以很容易的纵向的系统，但是添加横向的控件确不易]

实现代码如下：

namespace AbstractN

{

    //AbstractFactory

    abstract public class ViewFactory

    {

        abstract public Button makeButton();

        abstract public TextBox makeTextBox();

    }

 

    //ConcreteFactory1

    public class WindowsView : ViewFactory

    {

        public override Button makeButton()

        {

            return new WindowsXPButton();

        }

 

        public override TextBox makeTextBox()

        {

            return new WindowsXPTextBox();

        }

    }

    //ConcreteFactory2

    public class UnixView : ViewFactory

    {

        public override Button makeButton()

        {

            return new UnixAixButton();

        }

 

        public override TextBox makeTextBox()

        {

            return new UnixAixTextBox();

        }

    }

 

    //AbstractProductA

    abstract public class Button

    {

        abstract public void ButtonName(string name);

        abstract public void ButtonSize();

    }

    //AbstractProductB

    abstract public class TextBox

    {

        abstract public double TextboxLen();

    }

 

    //ProductA1

    public class WindowsXPButton : Button

    {

        public override void ButtonName(string name)

        {

            Console.WriteLine("Xp系统的按钮默认名：" + name);

        }

        public override void ButtonSize()

        {

            Console.WriteLine("按钮尺寸可调整！");

        }

    }

    //ProductA2

    public class UnixAixButton : Button

    {

        public override void ButtonName(string name)

        {

            Console.WriteLine("AIX系统的按钮默认名：" + name);

        }

 

        public override void ButtonSize()

        {

            Console.WriteLine("按钮尺寸不调整！");

        }

    }

 

    //ProductB1

    public class WindowsXPTextBox : TextBox

    {

        public override double TextboxLen()

        {

            return 12.9;

        }

    }

    //ProductB2

    public class UnixAixTextBox : TextBox

    {

        public override double TextboxLen()

        {

            return 19.2;

        }

    }

 

    //Client端----------------------------

    public class Client

    {

        Button button;

        TextBox textbox;

        public Client(ViewFactory system)

        {

            button = system.makeButton();

            textbox = system.makeTextBox();

        }

 

        public void showAllView()

        {

            button.ButtonName("按钮名称");

            button.ButtonSize();

            Console.WriteLine(textbox.TextboxLen().ToString());

        }

    }

 

    class Program

    {

        static void Main(string[] args)

        {

            ViewFactory v = new WindowsView();

            Client client = new Client(v);

            client.showAllView();

 

            ViewFactory v1 = new UnixView();

            Client c1 = new Client(v1);

            c1.showAllView();

        }

    }

}

我们以后在增加/替换系统的时候，可以增加一些DLL，切换相关的引用；

但是在增加控件的时候，类库项目和Client端的变动都较大。