【设计模式】之 Visitor 观察者模式

最新推荐文章于 2025-03-25 22:19:19 发布

sniper007

最新推荐文章于 2025-03-25 22:19:19 发布

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分类专栏：设计模式文章标签：设计模式 class string c

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本文深入探讨了访问者模式的概念、实现方式及其在员工管理中的应用，通过具体实例展示了如何使用访问者模式来调整员工的收入和休假天数。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace DesignFactory.Visitor
{
    /// <summary>
    /// 访问者模式
    /// </summary>
    class VisitorPattern
    {
    }

   abstract class Element
   {
   abstract public void Accept(Visitor visitor);
   }

    abstract class Visitor
    {
        abstract public void Visit(Element element);       
    }

    class Employee : Element
    {
        public Employee(string name, double income, int vacationDays)
        {
            this.name = name;
            this.income = income;
            this.vacationDays = vacationDays;
        }

        public override void Accept(Visitor visitor)
        {
            visitor.Visit(this);
        }


        private string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        private double income;

        public double Income
        {
            get { return income; }
            set { income = value; }
        }


        private int vacationDays;

        public int VacationDays
        {
            get { return vacationDays; }
            set { vacationDays = value; }
        }
        
        


    }

    class IncomeVisitor : Visitor
    {
        public override void Visit(Element element)
        {
            Employee employee = (Employee)element;

            employee.Income *= 1.10;
            Console.WriteLine("{0}'s new income:{1:C}", employee.Name, employee.Income);
        }
    }

    class VacationVisitor : Visitor
    {
        public override void Visit(Element element)
        {
            Employee employee = (Employee)element;

            employee.VacationDays +=3;
            Console.WriteLine("{0}'s new vacation days:{1:C}", employee.Name, employee.VacationDays);
        }
    }

    class Employees
    {
        private ArrayList employees = new ArrayList();
        public void Attach(Employee employee)
        {
            employees.Add(employee);
        }

        public void Detach(Employee employee)
        {
            employees.Remove(employee);
        }

        public void Accept(Visitor visitor)
        {
            foreach (Employee e in employees)
            {
                e.Accept(visitor);
            }
        }
    }


    public class VisitorApp
    {
        public static void Main(string[] args)
        {
            Employees e = new Employees();
            e.Attach(new Employee("Hank", 25000.0, 14));
            e.Attach(new Employee("Elly", 35000.0, 16));
            e.Attach(new Employee("Dick", 45000.0, 21));


            IncomeVisitor v1 = new IncomeVisitor();
            VacationVisitor v2 = new VacationVisitor();


            e.Accept(v1);
            e.Accept(v2);
        }
    }



}