C＃的简单继承问题 [英] Simple inheritance problem with C#

问题描述

我有两个班，动物和狗。狗继承自动物类。为什么我无法使用dog.b访问字段b？如果狗继承自Animal，那么它应该知道b吗？

I have 2 classes, Animal and dog. dog inherits from Animal class. How come i am not able to access the field b with dog.b ? If dog inherits from Animal , then should it know about b ?

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

namespace inheritance1
{
    class Program
    {
        static void Main(string[] args)
        {



            Animal a = new Animal();

            a.b = 5;

            Console.WriteLine(a.b);



            dog d = new dog();

            dog.b = 4;

            Console.WriteLine(dog.b);

            Console.ReadKey();


        }
    }


    class Animal
    {
        public int b = 3;
    
    }

    class dog : Animal
    { 
    }




}

我尝试过：



dog.b = 4;

What I have tried:

dog.b = 4;

推荐答案

您可以访问 b 使用dog实例的字段，但这里的问题是你直接使用类名而不是实例变量，你需要使用 d 来调用它喜欢：

You can access the b field using the dog instance, but the problem here is you are using class name directly instead of instance variable, you need to call it using d like :

dog d = new dog();

d.b = 4; // note this, use instance variable not class name

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