new与override区别_new和override的区别-优快云博客

本文通过一个C#示例演示了继承与重写的基本概念。示例中定义了一个基类Dad及两个派生类SmallSon和BigSon，并展示了如何通过实例化派生类来调用被重写的方法。

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

namespace Newoverride
{
    class Dad
    {
        public Dad()
        {
            Console.WriteLine("Dad construtor");
        }
        public virtual void method()
        {
            Console.WriteLine("Dad method");
        }
    }
    class SmallSon : Dad
    {
        public SmallSon()
        {
            Console.WriteLine("Smallson construtor");
        }
        public override void method()
        {
            Console.WriteLine("override Smallson method");
        }
    }
    class BigSon : Dad
    {
        public BigSon()
        {
            Console.WriteLine("BigSon construtor");
        }
        public new void method()
        {
            Console.WriteLine("new BigSon method ");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Dad f = new Dad();
            f.method();
            Dad f1 = (Dad)new SmallSon();// 先初始化Dad(),然后再初始化SmallSon()
            f1.method();//override smallson method
            Dad f2 = (Dad)new BigSon();// 先初始化Dad(),然后再初始化Bigson()
            f2.method();// Dad method
            BigSon s = new BigSon();
            s.method();

        }
    }
}