覆盖代码 [英] override code

问题描述

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
}
public class N
{
    public int M()
    {
        return 20;
    }
    public class O
    {
        public virtual int M1(int x, int y)
        {
            return 10;
        }
    }
}

public class P
{ 
//override the virtual method M present in class O
   // public override int M1(int x, int y)
   // {
    //    return 30;

   // }


}

我的目标是覆盖O类中的虚拟方法M.我做了但是我收到了错误。任何人都可以告诉我任何其他方法吗？

my Aim is to override the virtual method M present in class O. I did but i am getting error. Can anybody tell me any other way to do it???

推荐答案

P类没有继承O类，所以你会得到一个不合适的错误可以找到方法来覆盖。此代码将编译：

Class P does no inherit from class O so you will get an error that no suitable method could be found to override. This code will compile:

    public class N
    {
        public int M()
        {
            return 20;
        }

        public class O
        {
            public virtual int M1(int x, int y)
            {
                return 10;
            }
        }

    }

    public class P : N.O
    {
        //override the virtual method M present in class O
        public override int M1(int x, int y)
        {
            return 30;

        }

    }

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