class1.cs

来自DoFactory的设计模式, 由于是本人根据已有代码创建,没有NETOptimized项

// Decorator pattern -- Structural example  

using System;

namespace DoFactory.GangOfFour.Decorator.Structural
{

    // MainApp test application 

    class MainApp
    {
        static void Main()
        {
            // Create ConcreteComponent and two Decorators 
            ConcreteComponent c = new ConcreteComponent();
            ConcreteDecoratorA d1 = new ConcreteDecoratorA();
            ConcreteDecoratorB d2 = new ConcreteDecoratorB();

            // Link decorators 
            d1.SetComponent(c);
            d2.SetComponent(d1);

            d2.Operation();

            // Wait for user 
            Console.Read();
        }
    }

    // "Component" 

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

    // "ConcreteComponent" 

    class ConcreteComponent : Component
    {
        public override void Operation()
        {
            Console.WriteLine("ConcreteComponent.Operation()");
        }
    }

    // "Decorator" 

    abstract class Decorator : Component
    {
        protected Component component;

        public void SetComponent(Component component)
        {
            this.component = component;
        }

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

    // "ConcreteDecoratorA" 

    class ConcreteDecoratorA : Decorator
    {
        private string addedState;

        public override void Operation()
        {
            base.Operation();
            addedState = "New State";
            Console.WriteLine("ConcreteDecoratorA.Operation()");
        }
    }

    // "ConcreteDecoratorB" 

    class ConcreteDecoratorB : Decorator
    {
        public override void Operation()
        {
            base.Operation();
            AddedBehavior();
            Console.WriteLine("ConcreteDecoratorB.Operation()");
        }

        void AddedBehavior()
        {
        }
    }
}