封装

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 封装
{
    class Program
    {
        static void Main(string[] args)
        {
            student s = new student();//实列化
            s.write();

            #region
            s.code = "101";
            s.score = 101;
            s.birthay = DateTime.Now;



            Console.WriteLine(s.code);
            Console.WriteLine(s.score);
            Console.WriteLine(s.birthay);
            Console.WriteLine(s.birthdaystr);
            Console.WriteLine(s.codeandscormsum);
            #endregion




            Console.ReadLine();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 封装
{
    class student
    {
        private string _code;//prevate 访问修饰符 并不是所有的
        //具体化
        public string code//public 访问权限最高的  所有的都可访问
        {
            get{ return _code;}
            set { _code = value;}
         }
     
        private string  _name;
        public string name { get; set; }//简写


        private decimal  _score;
        public decimal score
        {
            get { return _score; }
            set 
            {
                if (value < 0 || value > 100)//确定取值范围
                {
                    _score = 0;
                }
                else
                {
                    _score = value;
                }
            }
        }
        private DateTime  _birthday;
        public DateTime birthay
        {
            get { return _birthday; }
            set { _birthday = value; }
        }


        public string birthdaystr
        {
            get { return _birthday.ToString("yyyy年mm月dd日"); }
        }

        public string codeandscormsum
        {
            get { return _code + _score; }
        }

        //成员方法
        public void write()
        {
            Console.WriteLine("我是stu的write方法！");
        }
    }
}