Decorator Pattern屬于Structural Patterns

介紹：

Decorator pattern的作用是提供一種方式動態(tài)的給一個(gè)對象添加新的職責(zé)或狀態(tài)，被裝飾的對象并不知道被“裝飾”了。A key implementation point in the Decorator pattern is that decorators both inherit the original class and contain an instantiation of it.

實(shí)現(xiàn)：

UML 類圖

public interface IComponent{string Operation();}/// <summary>/// 被裝飾者/// </summary>public class Component : IComponent{#region IComponent Memberspublic string Operation(){return "I'm a photo;";}#endregion}/// <summary>/// 裝飾者A/// </summary>public class DecoratorA : IComponent{IComponent component;public DecoratorA(IComponent component){this.component = component;}#region IComponent Memberspublic string Operation(){return component.Operation() + "and decorated by DecoratorA";}#endregion}/// <summary>/// 裝飾者B/// </summary>public class DecoratorB : IComponent{IComponent component;public string AddedState = " and added state";public DecoratorB(IComponent component){this.component = component;}#region IComponent Memberspublic string Operation(){return component.Operation() + "and decorated by DecoratorB";}public string AddedBehavior(){return " and added behavior by DecoratorB";}#endregion}public class Client{public static void Display(string s, IComponent component){Console.WriteLine(s + component.Operation());}}[TestFixture]public class DecoratorTest{[Test]public void T1(){var component = new Component();Client.Display(string.Empty, component);var decoratorB = new DecoratorB(component);Client.Display("hello!", decoratorB);}}

轉(zhuǎn)載于:https://www.cnblogs.com/dushouke/archive/2012/03/16/2400274.html

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