c# base关键字

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���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。