代码1：访问者

//状态    abstract class Action    {        //得到男人结论或反应        public abstract void GetManConclusion(Man concreteElementA);        //得到女人结论或反应        public abstract void GetWomanConclusion(Woman concreteElementB);    }    //成功    class Success : Action    {        public override void GetManConclusion(Man concreteElementA)        {            Console.WriteLine("{0}{1}时，背后多半有一个伟大的女人。", concreteElementA.GetType().Name, this.GetType().Name);        }        public override void GetWomanConclusion(Woman concreteElementB)        {            Console.WriteLine("{0}{1}时，背后大多有一个不成功的男人。", concreteElementB.GetType().Name, this.GetType().Name);        }    }    //失败    class Failing : Action    {        public override void GetManConclusion(Man concreteElementA)        {            Console.WriteLine("{0}{1}时，闷头喝酒，谁也不用劝。", concreteElementA.GetType().Name, this.GetType().Name);        }        public override void GetWomanConclusion(Woman concreteElementB)        {            Console.WriteLine("{0}{1}时，眼泪汪汪，谁也劝不了。", concreteElementB.GetType().Name, this.GetType().Name);        }    }    //恋爱    class Amativeness : Action    {        public override void GetManConclusion(Man concreteElementA)        {            Console.WriteLine("{0}{1}时，凡事不懂也要装懂。", concreteElementA.GetType().Name, this.GetType().Name);        }        public override void GetWomanConclusion(Woman concreteElementB)        {            Console.WriteLine("{0}{1}时，遇事懂也装作不懂", concreteElementB.GetType().Name, this.GetType().Name);        }    }    //结婚    class Marriage : Action    {        public override void GetManConclusion(Man concreteElementA)        {            Console.WriteLine("{0}{1}时，感慨道：恋爱游戏终结时，‘有妻徒刑’遥无期。", concreteElementA.GetType().Name, this.GetType().Name);        }        public override void GetWomanConclusion(Woman concreteElementB)        {            Console.WriteLine("{0}{1}时，欣慰曰：爱情长跑路漫漫，婚姻保险保平安。", concreteElementB.GetType().Name, this.GetType().Name);        }    }

代码2：访问者操作的元素

//人    abstract class Person    {        //接受        public abstract void Accept(Action visitor);    }    //男人    class Man : Person    {        public override void Accept(Action visitor)        {            visitor.GetManConclusion(this);        }    }    //女人    class Woman : Person    {        public override void Accept(Action visitor)        {            visitor.GetWomanConclusion(this);        }    }

代码3：元素集合

//对象结构    class ObjectStructure    {        private IList
     
       elements = new List
      
       ();        //增加        public void Attach(Person element)        {            elements.Add(element);        }        //移除        public void Detach(Person element)        {            elements.Remove(element);        }        //查看显示        public void Display(Action visitor)        {            foreach (Person e in elements)            {                e.Accept(visitor);            }        }    }
      
     

代码4：客户端代码

class Program    {        static void Main(string[] args)        {            ObjectStructure o = new ObjectStructure();            o.Attach(new Man());            o.Attach(new Woman());            Success v1 = new Success();            o.Display(v1);            Failing v2 = new Failing();            o.Display(v2);            Amativeness v3 = new Amativeness();            o.Display(v3);            Marriage v4 = new Marriage();            o.Display(v4);            Console.Read();        }    }