多态之重写

一、先定义一个被重写类jisuan，重点是用关键字virtual

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

namespace 多态
{
    class jisuan
    {
        public virtual int jiafa(int a, int b)
        {
            return a + b;

        }
    }
}

二、再定义一个重写类jisuan2，重点是用关键字override

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

namespace 多态
{
   class jisuan1:jisuan

    {
       public override int jiafa(int a, int b)
       {
           return a + b + 100;
       }
    }
}

三、实现两个功能

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 多态
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            jisuan js1 = new jisuan();
            int c = js1.jiafa(100, 50);
            MessageBox.Show(c.ToString());
        }

        private void button2_Click(object sender, EventArgs e)
        {
            jisuan1 js2 = new jisuan1();
            int c = js2.jiafa(100, 50);
            MessageBox.Show(c.ToString());
        }
    }
}

四、结果展示