public class VisitorMode
    {
        public void Main()
        {
            ObjectStructure o = new ObjectStructure();
            o.Attach(new Man());
            o.Attach(new Woman());

            Success s1 = new Success();
            o.Display(s1);

            Failing f1 = new Failing();
            o.Display(f1);
        }
    }

    /// <summary>
    /// 定义Visit操作
    /// </summary>
    public abstract class Visitor
    {
        //操作1
        public abstract void VisitConcreteElementA(ConcreteElementA concreteElementOne);

        //操作2
        public abstract void VisitConcreteElementB(ConcreteElementB concreteElementTwo);
    }

    //操作1
    public class ConcreteVisitorOne : Visitor
    {
        public override void VisitConcreteElementA(ConcreteElementA concreteElementOne)
        {
            Console.WriteLine("{0}被{1}存取", concreteElementOne.GetType().Name, this.GetType().Name);
        }

        public override void VisitConcreteElementB(ConcreteElementB concreteElementTwo)
        {
            Console.WriteLine("{0}被{1}存取", concreteElementTwo.GetType().Name, this.GetType().Name);
        }
    }
    //操作2
    public class ConcreteVisitorTwo : Visitor
    {
        public override void VisitConcreteElementA(ConcreteElementA concreteElementOne)
        {
            Console.WriteLine("{0}被{1}存取", concreteElementOne.GetType().Name, this.GetType().Name);
        }

        public override void VisitConcreteElementB(ConcreteElementB concreteElementTwo)
        {
            Console.WriteLine("{0}被{1}存取", concreteElementTwo.GetType().Name, this.GetType().Name);
        }
    }

    //访问者
    public abstract class ElementVisitor
    {
        public abstract void Accept(Visitor visitor);
    }

    //访问者A
    public class ConcreteElementA : ElementVisitor
    {
        public override void Accept(Visitor visitor)
        {
            visitor.VisitConcreteElementA(this);
        }

        public void OperactionA() { }
    }

    //访问者B
    public class ConcreteElementB : ElementVisitor
    {
        public override void Accept(Visitor visitor)
        {
            visitor.VisitConcreteElementB(this);
        }

        public void OperactionB() { }
    }


    /// <summary>
    /// 结构对象
    /// </summary>
    class VisitorObjectStructure
    {
        private IList<ElementVisitor> elements = new List<ElementVisitor>();

        public void Attach(ElementVisitor element)
        {
            elements.Add(element);
        }

        public void Detch(ElementVisitor element)
        {
            elements.Remove(element);
        }

        public void Accept(Visitor element)
        {
            foreach (ElementVisitor item in elements)
            {
                item.Accept(element);
            }
        }
    }