anaconda 安装环境出现 DEBUG:urllib3.connectionpool:Starting new HTT

c# base关键字

1. 调用父类的构造函数

 	class Father
    {
        public int Age { get; set; }
        public string Name { get; set; }
        public Father(int age,string name)
        {
            this.Age = age;
            this.Name = name;
        }
    }
    class Son:Father 
    {
        public int Height { get; set; }
        public Son(int age,string name,int height):base (age,name)
        {
            this.Height = height;
        }
    }

    class grandson : Son
    {
        public grandson(int age, string name, int height) : base(age, name )
        {
            this.Height = height;
        }
    }

会发现上面的代码报错，因为grandson 这个类的构造函数使用base调用父类构造函数时，提示缺少了height这个参数，这是因为base调用的只是它的父类也就是Son这个类的构造函数，而不是最顶层的Father这个类的构造函数，所以这里报错改成如下代码即可：

class Father
{
    public int Age { get; set; }
    public string Name { get; set; }
    public Father(int age,string name)
    {
        this.Age = age;
        this.Name = name;
    }
}
class Son:Father 
{
    public int Height { get; set; }
    public Son(int age,string name,int height):base (age,name)
    {
        this.Height = height;
    }
}

class grandson : Son
{
    public grandson(int age, string name, int height) : base(age, name,height  )
    {
        this.Height = height;
    }
}

2. 调用父类的方法或者属性

 	class Father
    {
        public int Age { get; set; }
        public string Name { get; set; }
        public Father(int age, string name)
        {
            this.Age = age;
            this.Name = name;
        }
        public void Test()
        {
            Console.WriteLine("我是Father");
        }

    }
    class Son : Father
    {
        public int Height { get; set; }
        public Son(int age, string name, int height) : base(age, name)
        {
            this.Height = height;
        }
        public void Test()
        {
            Console.WriteLine("我是Son");
        }
    }


    class grandson : Son
    {
        public grandson(int age, string name, int height) : base(age, name, height)
        {
            this.Height = height;
        }

        public void Show()
        {
            int age = base.Age;
            base.Test();
        }
    }

调用：

grandson father = new grandson(100, "小明", 180);
father.Show();

输出：

我是Son

可以看出调用的方法不是father类中的test方法，而是Son类，也就是grandson的父类的方法。