CSharp设计模式读书笔记（10）：装饰模式(学习难度：★★★☆☆，使用频率：★★★☆☆)...

装饰模式(Decorator Pattern)：

动态地给一个对象增加一些额外的职责，就增加对象功能来说，装饰模式比生成子类实现更为灵活。

模式角色与结构：

示例代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace CSharp.DesignPattern.DecoratorPattern
{class Program{static void Main(string[] args){Component component;Component componentDecorator;component = new Window();componentDecorator = new ScrollBarDecorator(component);componentDecorator.display();component = new TextBox();componentDecorator = new BlackBorderDecorator(component);componentDecorator.display();Console.ReadLine();}}// 抽象构件abstract class Component{public abstract void display();}// 具体构件class Window : Component{public override void display(){Console.WriteLine("Window...");}}class TextBox : Component{public override void display(){Console.WriteLine("TextBox...");}}// 抽象装饰类class ComponentDecorator : Component{private Component component; // 维持对抽象构件类型对象的引用public ComponentDecorator(Component component) // 注入抽象构件类型的对象
        {this.component = component;}public override void display(){component.display();}}// 具体装饰类class ScrollBarDecorator : ComponentDecorator{public ScrollBarDecorator(Component component) : base(component){   }public override void display(){this.SetScrollBar();base.display();}public void SetScrollBar(){Console.WriteLine("Add Scroll Bar...");}}class BlackBorderDecorator : ComponentDecorator{public BlackBorderDecorator(Component component): base(component){ }public override void display(){this.SetBlackBorder();base.display();}public void SetBlackBorder(){Console.WriteLine("Add Black Border...");}}
}