虚方法实现多态

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            employee[] emp = new employee[3];
            emp[0] =new  manager("A","28");
            emp[1] =new  secretary("B","30");
            emp[2] =new  saler("C","27");
            foreach (employee e in emp)
            {
                e.starwork();
            }
            Console.Read();
        }
    }
    //创建类employee
    class employee
    {
        private string _age;       
        private string _name;
        public employee() { }
        public employee(string name,string age)
        {
            _name = name;
            _age = age;
        }
        public virtual void starwork()
        {

            Console.Write(_name + "员工"+_age+"岁，开始工作,");
        }
    }
    //创建类secretary 继承于employee
    class secretary : employee
    {//派生类显示调用基类的构造函数
        public secretary(string name,string age) : base(name,age) {}
        public override void starwork()
        {
            base.starwork();
            Console.WriteLine("秘书负责协助工作");
        }
    }
    //创建类manager 继承于employee
    class manager : employee 
    {
        public manager(string name,string age) : base(name,age) {}
        public override void starwork()
        {
            base.starwork();
            Console.WriteLine("经理负责管理工作");
        }
    }
    //创建类saler 继承于employee
    class saler : employee
    {
        public saler(string name, string age) : base(name, age) { }
        public override void starwork()
        {
            base.starwork();
            Console.WriteLine("销售人员负责销售商品");
        }
    }
}