[C#] 访问控制符——public，protected，private

	public	protected	private
类的内部	√	√	√
派生类的内部	√	√	×
类以及派生类的外部	√	×	×

示例

using Console = System.Console;
namespace test;

public class Animal
{
    private string pri;
    protected string pro;
    public string pub;
    //构造函数
    public Animal()
    {
    }
    public Animal(string pri, string pro, string pub)
    {
        this.pri = pri;
        this.pro = pro;
        this.pub = pub;
    }

    //类的内部
    public void AnimalInnerPrint()
    {
        Console.WriteLine("在类的内部访问");
        Console.WriteLine(pri);
        Console.WriteLine(pro);
        Console.WriteLine(pub);
    }
}

namespace test;

public class Dog:Animal
{
    //构造函数
    public Dog()
    {
    }
    public Dog(string pri, string pro, string pub) : base(pri, pro, pub)
    {
    }

    public void DogInnerPrint()
    {
        Console.WriteLine("在派生类dog的内部访问");
        //private未能被派生类继承
        //Console.WriteLine(pri);
        Console.WriteLine(pro);
        Console.WriteLine(pub);
    }
}

using System;

namespace test;

public class Test
{
    public static void Main()
    {
        Animal animal = new Animal("private","protected","public");
        Dog dog = new Dog("private", "protected", "public");
        animal.AnimalInnerPrint();
        dog.DogInnerPrint();
        //在类的外部访问
        Console.WriteLine("在类的外部访问");
        //Console.WriteLine(animal.pri);
        //Console.WriteLine(animal.pro);
        Console.WriteLine(animal.pub);
    }
}

运行截图

结论

C#通过访问控制符限制访问权——

1. 通过private保护自身
2. 通过protected将成员以及继承给派生类的成员予以保护
3. 通过public暴露给外部以供使用