virtual与override

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例子1：using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication11
{
    public interface aa//定义接口
    {
       int d(int a,int b);
        void beep();
    }
    class Program
    {
        static void Main(string[] args)
        {
            hh n = new hh();
            Console.WriteLine(n.d(12,12));
            hh h = new hh();
            h.beep();
            Console.Read();
        }
    }
    class hh :aa
    {
        public int d(int a,int b)
        {
           return a * b;
        }
        public void beep()
        {
            Console.Beep();//主机响声
        }
    }

例子2：

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

namespace 接口
{
    public interface junbao
    {
        int jxmj(int c, int k);
        int zfxmj(int bc);
        double ymj(int r);
        float txmj(int sd, int xd, int g);
    }
    class Program
    {
        static void Main(string[] args)
        {
            int a, b, c, d, e, f,g;
            Console.WriteLine("请输入矩形长：");
            a = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入矩形宽：");
            b = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入正方形变长：");
            c = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入圆的半径：");
            d = int .Parse(Console.ReadLine());
            Console.WriteLine("请输入梯形的上底：");
            e = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入梯形的下底：");
            f = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入梯形的高：");
            g = int.Parse(Console.ReadLine());
            area jx = new area();
            area zf = new area();
            area y = new area();
            area tx =new area();
            for (int i = 1; i <= 26; i++)
            {
                Console.Write("---");
            }
            Console.WriteLine();
            Console.WriteLine("矩形面积为：{0}", jx.jxmj(a, b));
            Console.WriteLine("正方形面积为：{0}", zf.zfxmj(c));
            Console.WriteLine("圆面积为：{0}", y.ymj(d));
            Console.WriteLine("梯面积为：{0}", tx.txmj(e,f,g));
            Console.Write("结束");
            Console.Read();
        }
    }
    class area
    {
        public int jxmj(int c, int k)
        {
            return c * k;
        }
        public int zfxmj(int bc)
        {
            return bc * bc;
        }
        public double ymj(int r)
        {
            return Math.PI * r*r;
        }
        public float txmj(int sd, int xd, int g)
        {
            return ((sd + xd) / 2) * g;
        }

    }
}