面对对象继承

我们可能会在一些类中，写一些重复的成员，我们可以将这些重复的成员，单独的封装到一个类中，作为这些类的父亲。
Student Teacher Driver 子类 派生类
Person 父类 基类
子类继承了父类的属性和方法，但是子类并没有继承父类的私有字段。

子类并有没继承父类的构造函数。但是子类会默认的调用父类无参数的构造函数，创建父类对象，让子类可以使用父类中的成员。
所以在父类中重新写了一个有参数的构造函数之后，那个无参数的就被干掉了，子类就调用不到了。
解决方法：
1、在父类中重新写一个无参数的构造函数。
2、在子类中显示的调用父类的构造函数，使用关键字：base()
public test(sting s):base(s)——->把s这个参数传给父类的构造函数。

—————————————————继承的特性———————————————————
1、单根性
2、传递性

using System;
namespace _059_面对对象继承_05_继承
{
    class Program
    {
        static void Main(string[] args)
        {
            Student student = new Student("老六", 18, '男', 10086);
            student.Study();
            Console.WriteLine("我的名字是：{0}，今年{1}岁了，是个{2}生，我的编号是{3}", student.Name, student.Age, student.Gender, student.Id);
            Console.ReadKey();
        }
    }
}
class Person
    {
        public Person(string name,int age,char gender)
        {
            this.Name = name;
            this.Age = age;
            this.Gender = gender;
        }
        private string _name;
        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
        private int _age;
        public int Age
        {
            get { return _age; }
            set { _age = value; }
        }
        private char _gender;
        public char Gender
        {
            get { return _gender; }
            set { _gender = value; }
        }
    }
class Student : Person
    {
        public Student(string name, int age, char gender, int id) : base(name, age, gender)
        {
            //this.Name = name;
            //this.Age = age;
            //this.Gender = gender;
            this.Id = id;
        }
        private int _id;
        public int Id
        {
            get { return _id; }
            set { _id = value; }
        }
        public void Study()
        {
            Console.WriteLine("学习");
        }
    }
class Teacher:Person
    {
        public Teacher(string name, int age, char gender, double salary) : base(name, age, gender)
        {
            //this.Name = name;
            //this.Age = age;
            //this.Gender = gender;
            this.Salary = salary;
        }
        private double _salary;
        public double Salary
        {
            get { return _salary; }
            set { _salary = value; }
        }
        public void Teach()
        {
            Console.WriteLine("讲课");
        }
    }
 class Driver:Person
    {
        public Driver(string name, int age, char gender, int driveTime) : base(name, age, gender)
        {
            //this.Name = name;
            //this.Age = age;
            //this.Gender = gender;
            this.DriveTime = driveTime;
        }
        private int _driveTime;
        public int DriveTime
        {
            get { return _driveTime; }
            set { _driveTime = value; }
        }
        public void Drive()
        {
            Console.WriteLine("开车");
        }
    }