装饰模式

    public abstract class Component
    {
        public abstract void Operation();
    }

    public abstract class Decorator : Component
    {
        protected Component component;
        public void SetComponent(Component component)
        {
            this.component = component;
        }

        public override void Operation()
        {
            if (component != null)
            {
                component.Operation();
            }
        }
    }

1     public class ConcreteComponent : Component
2     {
3         public override void Operation()
4         {
5             Console.WriteLine("制造一个人");
6         }
7     }

 1     public class ConcreteDecoratorA : Decorator
 2     {
 3         public string addedState;
 4         public override void Operation()
 5         {
 6             base.Operation();
 7             addedState = "New State";
 8             Console.WriteLine("穿衣服");
 9         }
10     }
11 
12     public class ConcreteDecoratorB : Decorator
13     {
14         public override void Operation()
15         {
16             base.Operation();
17             AddedBehavior();
18         }
19 
20         private void AddedBehavior()
21         {
22             Console.WriteLine("理发");
23         }
24     }

 1  /// <summary>
 2     /// 装饰模式
 3     /// </summary>
 4     public class DoDecorator : DesignPattern
 5     {
 6         public override void ExeFun()
 7         {
 8             ConcreteComponent c = new ConcreteComponent();
 9             ConcreteDecoratorA da = new ConcreteDecoratorA();
10             ConcreteDecoratorB db = new ConcreteDecoratorB();
11             da.SetComponent(c);
12             db.SetComponent(da);
13             db.Operation();
14         }
15     }