C#类 和 对象的练习

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace studentFrom
{
    public partial class Form1 : Form
    {
        Student Mdc;   //定义一个全局的名字
        int index = 0;
        public Form1()
        {
            InitializeComponent();
            Mdc = new Student(        //页面的最初的状态
                          "黑马",
                          "崔牛",
                          "太监",
                          1625
                          );
            richTextBox1.Text = Mdc.StudentInfo();     输出 Mdc的信息
            timer1.Enabled = true;
        }


        private void button1_Click(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {

            Mdc.ModifyProf("");
            richTextBox1.Text = Mdc.StudentInfo();

        }

        private void timer1_Tick(object sender, EventArgs e)      //添加一个时钟进行计数
        {
            index++;
            Mdc.ModifyProf("专业泡妞" + index.ToString() + "年");
            richTextBox1.Text = Mdc.StudentInfo();

        }




    }
}

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

namespace studentFrom
{
    class Student
    {
        String StudentName;      //字符串的表达学生的名字
        String Professional;     //字符串表达的专业
        String Sex;              //  性别
        int BrithYear;           //出生年
       public Student(String MyName,
                String MyProf,
                String MySex,
                int MyBirthYear
            )
        {
            StudentName = MyName;
            Professional = MyProf;
            Sex = MySex;
            BrithYear = MyBirthYear;
        }
        public String StudentInfo()
        {
            String Info = "";
            Info = "我的专业:" + Professional;
            return Info;
        }
        public void ModifyProf(String NewProf)      //通过公共的方法访问修改内部的数据
        {
            Professional =NewProf;

        }

    }
}

图片如下：