C# this,base,new关键字

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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace _04三个关键字{    class Program    {        static void Main(string[] args)        {            //Student s = new Student();            //s.Name = "大黄老师";            //s.Test();            //Teacher t = new Teacher("大黄老师", 18, '女', 50, 50, 50);            //t.ShowScore();            //t.SayHi();            //Teacher t2 = new Teacher("春老师", 18, '女');            //t2.SayHi();            Teacher t3 = new Teacher("张三", 100, 100, 100);            t3.ShowScore();            Console.ReadKey();        }    }    class Person    {        public void SayHello()        {            Console.WriteLine("我是人类");        }    }    class Student : Person    {        public new void SayHello()//彻底隐藏了父类的SayHello()        {            Console.WriteLine("我是学生");        }        public Student GetStudent()        {            return this;        }        public void GetPerson()        {            base.SayHello();        }        public string Name { get; set; }        public void Test()        {            //局部变量优先级高于成员变量            string Name = "春生老师";            Console.WriteLine("我的名字叫{0}", this.Name);        }    }    class Teacher    {        public string Name { get; set; }        public int Age { get; set; }        public char Gender { get; set; }        public int Chinese { get; set; }        public int Math { get; set; }        public int English { get; set; }        public Teacher(string name, int age, char gender, int chinese, int math, int english)        {            this.Name = name;            this.Age = age;            this.Gender = gender;            this.Chinese = chinese;            this.Math = math;            this.English = english;        }        public Teacher(string name, int age, char gender)            : this(name, age, gender                , 0, 0, 0)        {        }        public Teacher(string name, int chinese, int math, int english)            : this(name, 0, '\0', chinese, math, english)        { }        public void SayHi()        {            Console.WriteLine("我叫{0},今年{1}岁了,我是{2}生", this.Name, this.Age, this.Gender);        }        public void ShowScore()        {            Console.WriteLine("我叫{0}，我的总成绩是{1}，平均成绩是{2}", this.Name, this.Chinese + this.Math + this.English, (this.Chinese + this.Math + this.English) / 3);        }    }}
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