基于C#编写计算机选课程序

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

namespace _6_1_
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string first = "";
        string second = "";
        string third = "";

        // 检查基础课选择
        private void checkFirst() {
            if (radioButton1.Checked)
                first = radioButton1.Text;
            else if (radioButton2.Checked)
                first = radioButton2.Text;
        }

        // 检查语言课选择
        private void checkSecond()
        {
            if (radioButton4.Checked)
                second = radioButton4.Text;
            else if (radioButton3.Checked)
                second = radioButton3.Text;
            else if (radioButton6.Checked)
                second = radioButton6.Text;
            else if (radioButton5.Checked)
                second = radioButton5.Text;
            else if (radioButton7.Checked)
                second = radioButton7.Text;
        }

        // 检查应用课选择
        private void checkThird() 
        {
            third = "";
            if (checkBox1.Checked)
                third += " " + checkBox1.Text + " ";
            if (checkBox2.Checked)
                third += " " + checkBox2.Text + " ";
            if (checkBox3.Checked)
                third += " " + checkBox3.Text + " ";
            if (checkBox4.Checked)
                third += " " + checkBox4.Text + " ";
            if (checkBox5.Checked)
                third += " " + checkBox5.Text + " ";
        }

        // 显示选课结果
        private void showMsg() {
            textBox1.Text = "您的选课结果如下：\r\n";
            if (!first.Equals(""))
                textBox1.Text += "基础：" + first + "\r\n";
            if (!second.Equals(""))
                textBox1.Text += "语言：" + second + "\r\n";
            if (!third.Equals(""))
                textBox1.Text += "应用：" + third + "\r\n";
        }

        // 事件处理
        private void radioButton4_CheckedChanged(object sender, EventArgs e)
        {
            checkFirst();
            showMsg();
        }
        
        private void Form1_Load(object sender, EventArgs e)
        {
            checkSecond();
            showMsg();
        }

        private void checkBox4_CheckedChanged(object sender, EventArgs e)
        {
            checkThird();
            showMsg();
        }
    }
}