C#实现学生成绩管理系统的代码如何写

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下面是结果演示

这是登录及部分添加

继续添加

继续添加及输出成绩

学生成绩查询

学生信息修改再输出

删除再输出

0直接退出了

/*
        Author：马志勇
        date:2020-10-14
*/


using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //2. 在用户登录界面提示用户输入用户名和密码，并根据用户名和密码决定    能否登录系统。
            //   3. 合法用户登陆成功后，在屏幕上显示如下功能菜单：
            //          1.学生成绩输入 2.学生成绩输出 3.学生成绩查询 4.学生成绩修改 0.退出系统
            //            提示用户输入选择号，用户输入正确的选择好后执行相应功能。执行完对应功   能后返回功能菜单。

            Console.WriteLine("欢迎来到成绩管理系统！");
            while (true) {
                Console.WriteLine("***请输入账号：");
                String userName = Console.ReadLine();
                Console.WriteLine("***请输入密码：");
                String userPassword = Console.ReadLine();
                if (userName.Equals("123456") && userPassword.Equals("456789"))
                {
                    Console.WriteLine("***账号密码正确请进入");
                    break;
                }
                else {
                    Console.WriteLine("账号密码不一致，是否重新进入！[1：重新输入---2：退出]");
                    int n = int.Parse(Console.ReadLine());
                    while (true) {
                        if (n == 1 || n == 2)
                        {
                            break;
                        }
                        else {
                            Console.WriteLine("***序号有误请重新输入！");
                            n = int.Parse(Console.ReadLine());
                        }
                    }
                    if (n==2) {
                        Process.GetCurrentProcess().Kill();
                    }
                }
            }

            showView();
            showChoice();

            StudentLinkedList link = new StudentLinkedList();
            
            
            while (true) {
                Console.WriteLine("***请选这些序号 ");
                int n = int.Parse(Console.ReadLine());
                switch (n) {
                    //0.退出系统
                    case 0: {
                            Process.GetCurrentProcess().Kill();
                            break;
                        }
                    //1.学生成绩输入
                    case 1: {
                            Console.WriteLine("***请输入ID账号：");
                            int id = int.Parse(Console.ReadLine());
                            Console.WriteLine("***请输入姓名：");
                            String name = Console.ReadLine();
                            Console.WriteLine("***请输入成绩：");
                            int score = int.Parse(Console.ReadLine());
                            link.add(getStudentNode(id, name, score));
                            break;
                        }
                    //2.学生成绩输出
                    case 2: {
                            link.show();
                            break;
                        }
                    // 3.学生成绩查询
                    case 3:
                        {
                            Console.WriteLine("***请输入你要查找的id账号");
                            int index = int.Parse(Console.ReadLine());
                            Student student=link.search(index);
                            Console.WriteLine(student.toString());
                            break;
                        }
                    //4.学生成绩修改
                    case 4:
                        {
                            Console.WriteLine("***[注]：只能修改成绩！");
                            Console.WriteLine("***请输入你要修改的id账号");
                            int index = int.Parse(Console.ReadLine());
                            Console.WriteLine("***请输入你要修改的id分数");
                            int score = int.Parse(Console.ReadLine());
                            link.upThis(index, score);
                            break;
                        }
                    case 5:
                        {
                            Console.WriteLine("***请输入你要删除的id账号");
                            int index = int.Parse(Console.ReadLine());
                            link.delete(index);
                            break;
                        }
                    default: {
                            break;
                        }
                        
                        
                }
                showChoice();
            }
            Console.ReadKey();
        }


        //获取节点对象
        public static StudentNode getStudentNode(int id,String name,int score ) {
            return new StudentNode(new Student(id,name,score));
        }

        //启动界面
        // 1.学生成绩输入 2.学生成绩输出 3.学生成绩查询 4.学生成绩修改 0.退出系统
        public static void showView() {
            Console.WriteLine("|----------------------------程序启动---------------------------|");
            Console.WriteLine("|\t\t\t学生成绩管理系统\t\t\t|");
            Console.WriteLine("|---------------------------------------------------------------|");
            Console.WriteLine("|\t\t\t开发人姓名：马志勇\t\t\t|");
            Console.WriteLine("|\t\t\t开发时间：2020-20-14\t\t\t|");
            Console.WriteLine("|\t\t\t按任意键进入系统\t\t\t|");
            Console.WriteLine("|---------------------------------------------------------------|");
        }
        public static void showChoice() {
            Console.WriteLine("|---------------------------------------------------------------|");
            Console.WriteLine("|\t\t\t0.退出系统\t\t\t\t|");
            Console.WriteLine("|\t\t\t1.学生成绩输入\t\t\t\t|");
            Console.WriteLine("|\t\t\t2.学生成绩输出\t\t\t\t|");
            Console.WriteLine("|\t\t\t3.学生成绩查询\t\t\t\t|");
            Console.WriteLine("|\t\t\t4.学生成绩修改\t\t\t\t|");
            Console.WriteLine("|\t\t\t5.删除这个学生\t\t\t\t|");
            Console.WriteLine("|---------------------------------------------------------------|");
        }

    }

    class StudentLinkedList
    {
        //定义一个头结点啥都不放
        StudentNode head = null;
        public StudentLinkedList() {
            head=new StudentNode(null);
        }
        //添加 按照学号顺序顺序进行添加
        //如果学号相同则不能添加
        public void add(StudentNode node)
        {
            if (head.next == null)
            {
                head.next = node;
                return;
            }
            //否则定义一个变量临时变量进行处理；
            StudentNode temp = head;
            int id = node.s.getId();
            bool flag = false;
            while (true)
            {
                if (temp.next == null)
                {
                    flag = false;
                    break;
                }
                if (temp.next.s.getId() > id)
                {
                    flag = false;
                    break;
                }
                else if (temp.next.s.getId() == id)
                {
                    //这个情况是有重复的就不能添加进去
                    flag = true;
                    break;
                }
                temp = temp.next;
            }
            if (flag)
            {
                Console.WriteLine("这个序号已经存在");
            }
            else {
                node.next=temp.next;
                temp.next = node;
            }
        }

        //删除
        //只能通过id进行删除
        public bool delete(int id) {
            if (head.next==null) {
                return false;
            }
            StudentNode temp = head;
            while (true) {
                if (temp.next==null) {
                    return false;
                }

                if (temp.next.s.getId()==id) {
                    break;
                }
                temp = temp.next;
            }
            if (temp.next.next != null)
            {
                temp.next = temp.next.next;
            }
            else {
                temp.next = null;
            }

            return true;
        }

        //修改
        //只能修改成绩
        public void upThis(int id,int score) {
            if (head.next == null)
            {
                Console.WriteLine("没有数据，无法修改！");
                return;
            }
            StudentNode temp = head.next;
            while (true) {
                if (temp==null) {
                    Console.WriteLine("没有这个ID数据!");
                    return;
                }
                if (temp.s.getId()== id) {
                    temp.s.setScore(score);
                    return;
                }
                temp = temp.next;
            }
        }

        //查询
        public Student search(int id)
        {
            if (head.next == null)
            {
                Console.WriteLine("没有数据，无法修改！");
                return null;
            }
            StudentNode temp = head.next;
            while (true)
            {
                if (temp == null)
                {
                    Console.WriteLine("没有这个ID数据!");
                    return null;
                }
                if (temp.s.getId() == id)
                {
                    return new Student(temp.s.getId(), temp.s.getName(), temp.s.getScore());
                }
                temp = temp.next;
            }
        }

        //遍历
        public void show() {
            Console.WriteLine("ID\t\t姓名\t\t分数");
            StudentNode temp = head.next;
            while (true) {
                if (temp==null) {
                    break;
                }
                Console.WriteLine(temp.s.getId()+"\t\t"+temp.s.getName()+"\t\t"+temp.s.getScore());
                temp = temp.next;
            }
        }
    }


    //创建一个链表进行处理这些数据
    class StudentNode
    {
        public Student s;
        public StudentNode next;
        public StudentNode(Student s)
        {
            this.s = s;
        }
    }
    //定义学生类
    class Student
    {
        private int id;
        private String name;
        private int score;
        public Student(int id, String name, int score)
        {
            this.id = id;
            this.name = name;
            this.score = score;
        }

        public void setId(int id)
        {
            this.id = id;
        }
        public int getId()
        {
            return this.id;
        }

        public String getName()
        {
            return this.name;
        }

        public void setName(String name)
        {
            this.name = name;
        }

        public int getScore()
        {
            return this.score;
        }

        public void setScore(int score)
        {
            this.score = score;
        }

        public String toString() {
            return "ID:"+getId() + "\t姓名：" + getName() + "\t成绩：" + getScore();
        }
    }

    //这是用户类
    class User
    {
        private String userName;
        private String userParsword;
        public User(String userName, String userParsword)
        {
            this.userName = userName;
            this.userParsword = userParsword;
        }
        public String getUserName()
        {
            return this.userName;
        }

        public void setName(String userName)
        {
            this.userName = userName;
        }

        public String getUserParsword()
        {
            return this.userParsword;
        }

        public void setUserParsword(String userParsword)
        {
            this.userParsword = userParsword;
        }
    }
}

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