装饰模式（Decorator）定义：
动态的给一个对象添加额外的职责，就增加功能来说，装饰模式比生成子类更灵活。
下面是书中，以小菜穿衣服为例子：
public class Test
{
void Main()
{
Person xc = new Person("小菜");
Debug.Log("第一种装扮:");
TShirts t = new TShirts();
Shooes s = new Shooes();
BigTrouser b = new BigTrouser();
t.Decorate(xc);
s.Decorate(t);
b.Decorate(s);
b.Show();
}
}
class Person
{
public Person() { }
private string name;
public Person(string name)
{
this.name = name;
}
public virtual void Show()
{
Debug.Log(string.Format("装扮的{0}", name));
}
}
//服饰类
class Finery : Person
{
Person component;
public void Decorate(Person com)
{
this.component = com;
}
public override void Show()
{
if (component != null)
component.Show();
}
}
//具体服饰类
class TShirts : Finery
{
public override void Show()
{
Debug.Log("大TShirt");
base.Show();
}
}
class BigTrouser : Finery
{
public override void Show()
{
Debug.Log("跨裤");
base.Show();
}
}
class Shooes : Finery
{
public override void Show()
{
Debug.Log("拖鞋");
base.Show();
}
}
