程序代码：

    class People
    {
        public People(string name, string gener, int age)
        {
            this.Name = name;
            this.Gender = gener;
            this.Age = age;
        }
        public string Name { get; set; }
        public string Gender { get; set; }
        public int Age { get; set; }
    }

    class Student : People
    {
        public Student(string name, string gener, int age, string speciality, string classValue)
            : base(name, gener, age)
        {
            this.Speciality = speciality;
            this.Class = classValue;
        }
        public string Speciality { get; set; }
        public string Class { get; set; }
    }

程序代码：

class Person
{
    private string name ;        //姓名
    private char sex;            //性别
    private uint age;            //年龄

    public Person(){}
   
    public Person(string name ,char sex , uint age)
    {
        Name = name;
        Sex = sex;
        Age = age;
    }
    public string Name
    {
        get{return name;}
        set{this.name = value;}
    }
    public char Sex
    {
        get{return sex;}
        set{this.sex = value;}
    }
    public uint Age
    {
        get{return age;}
        set{this.age = value;}
    }
}

class Student : Person
{
    private string studentClass;        //班级
    private string specialty;           //专业
   
    public Student(){}
    public Student(string studentClass , student specialty)
    {
        StudentClass = studentClass;
        Specialty = specialty;
    }
    public Student(string name, char sex , uint age , string studentClass , string specialty) : base(name , sex , age)
    {
        StudentClass = studentClass;
        Specialty = specialty;
    }
    public string StudentClass
    {
        get{return studentClass;}
        set{this.studentClass = value;}
    }
    public string Specialty
    {
        get{return specialty;}
        set{this.specialty = value;}
    }
    public String toString()
    {
        return "我叫" + this.Name + "。\n性别：" + this.Sex + "\n班级：" + this.StudentClass + "\n专业：" + Specialty;
    }
}

class Test
{
    Student ZS = new Student("张三" , '男' , 20 , "XX" , "计算机");
    Console.WriteLine(ZS.toString());
}