C# Learning Diary 22---Multiple Inheritance

Inheritance is one of the most important concepts in object-oriented programming. Inheritance allows us to define a class based on one class to define another class. When a class is derived from another class, the derived class inherits the characteristics from the base class

The idea of ​​inheritance is realized Belongs to (IS-A ) relation. For example, mammals are (IS-A) animals, dogs are (IS-A) mammals, so dogs are (IS-A) animals.

Base class and derived class:

In C#, a derived class inherits members, methods, properties, fields, events, index indicators from its direct base class but except for constructors and destructors function.

Write an example below.

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
  
namespace Test  
{  
    class Anlimal  //定义一个基类  
    {  
        protected int foot = 4;  
        protected double weight = 22.4;  
        protected void say(string type, string call)  
        {  
            Console.WriteLine("类别：{0}，叫声：{1} ",type,call);  
        }  
    }  
   
    //Dog 继承Anlimal   
    class Dog:Anlimal  
    {  
        static void Main(string[] args)  
        {  
            Dog dog = new Dog();  
            int foot = dog.foot;  
            double weight = dog.weight;  
            Console.WriteLine("dog foot: {0}\ndog weight:{1}",foot,weight);  
            dog.say("狗", "汪汪");  
        }  
    }  
}

Result

Multiple inheritance:

C# does not support multiple inheritance. However, you can use interfaces to implement multiple inheritance. In the above example, we added a smallanlimal interface for it

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
  
namespace Test  
{  
    class Anlimal  //定义一个基类  
    {  
        protected int foot = 4;  
        protected double weight = 22.4;  
        protected void say(string type, string call)  
        {  
            Console.WriteLine("类别：{0}，叫声：{1} ",type,call);  
        }  
    }  
  
    public interface smallanlimal  //添加一个接口 接口只声明方法在子类中实现  
    {  
        protected void hight(double hight);  
         
    }  
    //Dog 继承Anlimal   
    class Dog:Anlimal,smallanlimal  
    {  
        public void hight(double hight)  //实现接口  
        {  
            Console.WriteLine("Hight: {0}",hight);  
        }  
        static void Main(string[] args)  
        {  
            Dog dog = new Dog();  
            int foot = dog.foot;  
            double weight = dog.weight;  
            dog.hight(23.23);  
            Console.WriteLine("dog foot: {0}\ndog weight:{1}",foot,weight);  
            dog.say("狗", "汪汪");  
        }  
    }  
}

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