C# 面向对象的new关键字的使用

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

namespace ConsoleApplicationTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Student s = new Student("‘zhangsan",19,1);
            //父类中的person say hello 没有输出，原因是隐藏了父类的方法 

            //如果想有意隐藏父类的同名方法 使用关键字new
            s.SayHello(); //student say hello


            Console.ReadKey();


        }
    }

    public class Person 
    {
        public string Name { get; set; }

        public int Age { get; set; }

        //父类构造函数
        public Person(string name,int age)
        {
            this.Name = name;
            this.Age = age;
        }

        public void SayHello()
        {
            Console.WriteLine("person say hello");
        }
    
    }

    public class Student:Person
    
    {
        public int Id { get; set; }


        //子类构造函数
        //关键字base的使用：调用父类的构造函数
        public Student(string name,int age,int id):base(name,age)
        {
            this.Id = id;
        }


        public new void SayHello()
        {

            Console.WriteLine("student say hello");
        }

    }
}