一、問題提出：

        1.創(chuàng)建相應的成員變量保存學生基本信息。

        2.創(chuàng)建相應屬性和索引以實現(xiàn)對成員變量訪問的封裝。

        3.創(chuàng)建相應的方法以實現(xiàn)對學生基本信息的管理。

        4.創(chuàng)建相應的方法以實現(xiàn)對學生成績的管理。

        5.派生出小學生，中學生，大學生等子類。

        二、問題分析：

        1、添加基類Student，定義私有成員變量姓名，性別，號，民族，住址，英語，數(shù)學，語文等學生的基本信息并創(chuàng)建相應的屬性實現(xiàn)對成員變量訪問的封裝。

        2、分別定義派生類Pupil，CollegeStudenr，Middleschoolstudent，并使用base關鍵字調(diào)用基類構造函數(shù)。

        3、添加Option類實現(xiàn)對學生信息進行的一系列操作。

        4、添加Manager類實現(xiàn)管理用戶登陸。

        三、程序代碼：

        Student.cs:

        using System;

        using System.Collections.Generic;

        using System.Linq;

        using System.Text;

        using System.Threading.Tasks;

        namespace StudentInformation

        public class Student

        private string studentType;

        public string StudentType

        getreturn studentType;

        setstudentType=value;

        private string studentName;

        public string StudentName

        get  return studentName;

        set  studentName = value;

        private string studentSex;

        public string StudentSex

        get  return studentSex;

        set  studentSex = value;

        private string studentNumber;

        public string StudentNumber

        get  return studentNumber;              

        set  studentNumber = value;         

        private string studentNation;

        public string StudentNation

        get  return studentNation;              

        set  studentNation = value;         

        private string studentAddress;

        public string StudentAddress

        get  return studentAddress;              

        set  studentAddress = value;         

        private string englishScore;

        public string EnglishScore

        get  return englishScore;

        set  englishScore = value;         

        private string mathScore;

        public string MathScore

        get  return mathScore;

        set  mathScore = value;

        private string chineseScore;

        public string ChineseScore

        get  return chineseScore;

        set  chineseScore = value;

        public Student(string type,string name,string sex,string number,string nation,string address,string english,string math,string chinese)

        this.studentType=type;

        this.studentName=name;

        this.studentSex=sex;

        this.studentNumber=number;

        this.studentNation=nation;

        this.studentAddress=address;

        this.englishScore=english;

        this.mathScore=math;

        this.chineseScore=chinese;

        public void showstudent()

        Console.WriteLine("該同學的基本信息為：");

        Console.WriteLine("學生類型：" studentType);

        Console.WriteLine("姓名：" studentName);

        Console.WriteLine("性別：" studentSex);

        Console.WriteLine("學號：" studentNumber);

        Console.WriteLine("住址：" studentAddress);

        Console.WriteLine("英語：" englishScore);

        Console.WriteLine("數(shù)學：" mathScore);

        Console.WriteLine("語文：" chineseScore);

        Option.cs:

        using System;

        using System.Collections.Generic;

        using System.Linq;

        using System.Text;

        using System.Threading.Tasks;

        namespace StudentInformation

        public class Option : Student

        int flag;

        public Option(string Type, string Name, string Sex, string Number, string Nation, string Address, string English, string Math, string Chinese) : base(Type, Name, Sex, Number, Nation, Address, English, Math, Chinese)        

        Console.WriteLine("對學生信息進行相關的操作");

        public void input()

        Console.WriteLine("請輸入一系列的相關信息");

        StudentName = Console.ReadLine();

        StudentSex = Console.ReadLine();

        StudentNumber = Console.ReadLine();

        StudentNation = Console.ReadLine();

        StudentAddress = Console.ReadLine();

        EnglishScore = Console.ReadLine();

        MathScore = Console.ReadLine();

        ChineseScore = Console.ReadLine();

        public void search_number(string numm)

        flag = 0;

        if (StudentNumber == numm)

        Console.WriteLine(StudentNumber   "被找到");

        flag = 1;

        public void search_name(string nname)

        flag = 0;

        if (StudentName == nname)

        Console.WriteLine(StudentName   "被找到");

        flag = 1;

        public void input_englishScore()

        Console.WriteLine("請重新輸入英語成績");

        string englishScore = Console.ReadLine();             

        this.EnglishScore = englishScore;

        public void input_chineseScore()

        Console.WriteLine("請重新輸入語文成績");

        string chineseScore = Console.ReadLine();             

        this.ChineseScore = chineseScore;

        public void input_mathScore()

        Console.WriteLine("請重新輸入數(shù)學成績");

        string mathScore = Console.ReadLine();

        this.MathScore = mathScore;

        public int getflag()

        return flag;

        Middleschoolstudent.cs:

        using System;

        using System.Collections.Generic;

        using System.Linq;

        using System.Text;

        using System.Threading.Tasks;

        namespace StudentInformation

        public class Middleschoolstudent:Option

        public Middleschoolstudent(string Type, string Name, string Sex, string Number, string Nation, string Address, string English, string Math, string Chinese) : base(Type, Name, Sex, Number, Nation, Address, English, Math, Chinese)

        StudentType = "中學生";

        Program.cs:

        using System;

        using System.Collections.Generic;

        using System.Linq;

        using System.Text;

        using System.Threading.Tasks;

        namespace StudentInformation

        class Program

        int number, judge = 0, flag, choose = 0;

        static void Main(string[] args)

        int i, j, n = 0, t = 0, k = 0;

        string find_name, find_number, delet_number, judgestring;

        Console.WriteLine("***********歡迎使用通用學生管理系統(tǒng)

        *************");

        Console.WriteLine("請輸入用戶名：");

        string username = Console.ReadLine();

        manager ma = new manager();

        ma.Next = username;

        if (ma.load())

        Console.WriteLine("           ************************           ");

        Console.WriteLine("             通用學生信息管理系統(tǒng)

        ");

        Console.WriteLine("           ************************           ");

        Console.WriteLine("             1.錄入基本信息

        ");

        Console.WriteLine("             2.刪除信息              ");

        Console.WriteLine("             3.修改基本信息

        ");

        Console.WriteLine("             4.查詢基本信息

        ");

        Console.WriteLine("             5.打印信息             ");

        Console.WriteLine("           ************************           ");

        Console.WriteLine("                 歡迎使用

        ");

        Console.WriteLine("           ************************           ");

        Console.WriteLine("");

        Console.WriteLine("請選擇學生類型：");

        Console.WriteLine("1.大學生");

        Console.WriteLine("2.中學生");

        Console.WriteLine("3.小學生");

        CollegeStudent[] g = new CollegeStudent[100];

        Middleschoolstudent[] m = new Middleschoolstudent[100];

        Pupil[] s = new Pupil[100];

        int choose = int.Parse(Console.ReadLine());

        switch (choose)

        case 1:

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：");

        int number1 = int.Parse(Console.ReadLine());

        int judge = 0;

        switch (number1)

        case 1:

        i = 0;

        do

        g[i] = new CollegeStudent("0", "0", "0", "0", "0", "0", "0", "0", "0");

        g[i].input();

        i  ;

        n  ;

        Console.WriteLine(" 是否繼續(xù)

        錄入檔案？是1.否2.");

        judge = int.Parse(Console.ReadLine());

         while (judge == 1);

        Console.WriteLine("共錄入"   n   "人");

        break;

        //錄入

        case 2:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入您要

        刪除的學號");

        delet_number =

        Console.ReadLine();

        for (i = 0; i

        g[i].search_number(delet_number);

        if (g[i].getflag() == 1)

        for (j = i; j

        g[j] = g[j   1];

        n--;

        t  ;

        Console.WriteLine("正

        在刪除");

        Console.WriteLine("刪

        除成功");

        if (t == 0)

        Console.WriteLine("您刪除

        的學生的學生學號不存在");

        Console.WriteLine("是否繼續(xù)刪

        除是1否2");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        //刪除

        case 3:

        Console.WriteLine("

        ****************************************   ");

        Console.WriteLine("         通用

        學生信息管理系統(tǒng)修改             ");

        Console.WriteLine("

        ****************************************  ");

        Console.WriteLine("             1.英語              ");

        Console.WriteLine("             2.數(shù)學             ");

        Console.WriteLine("             3.語文             ");

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：");

        int number2 =

        int.Parse(Console.ReadLine());

        switch (number2)

        case 1:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的英語成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        g[i].search_number(find_number);

        if

        (g[i].getflag() == 1)

        g[i].input_englishScore();

        t  ;

        if (t == 0) Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)錄入檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 2:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的數(shù)學成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        g[i].search_number(find_number);

        if

        (g[i].getflag() == 1)

        g[i].input_mathScore();

        t  ;

        if (t == 0)

        Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 3:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的語文成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        g[i].search_number(find_number);

        if

        (g[i].getflag() == 1)

        g[i].input_chineseScore();

        t  ;

        if (t == 0) Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

         //修改

        case 4:

        Console.WriteLine("

        ****************************************  ");

        Console.WriteLine("             通用學生信息管理查詢             ");

        Console.WriteLine("

        ****************************************  ");

        Console.WriteLine("             1.學號             ");

        Console.WriteLine("             2.姓名             ");

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：");

        int number2 =

        int.Parse(Console.ReadLine());

        switch (number2)

        case 1:

        do

        t = 0;

        judge = 0; Console.WriteLine("請輸入你要查找的學生的學號：");

        Console.ReadLine();

        for (i = 0; i

        if

        (g[i].getflag() == 1)

        g[i].showstudent();

        t  ;

        if (t == 0) Console.WriteLine("您要找的學號不存在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 2:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要查找的學生的姓名：");

        find_name = Console.ReadLine();

        for (i = 0; i

        if

        (g[i].getflag() == 1)

        g[i].showstudent();

        if (t == 0) Console.WriteLine("您要找的姓名不存在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        Console.WriteLine(" 是否繼續(xù)其他查詢方案檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 5:

        for (i = 0; i

        g[i].showstudent();

        break;

        Console.WriteLine(" 是否繼續(xù)其他查詢方案檔案？是1.否2.");

        judgestring = Console.ReadLine();

         while (judgestring == "1");

        break;

        case 2:

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：

        ");

        int number1 = int.Parse(Console.ReadLine());                                 int judge = 0;

        switch (number1)

        case 1:

        i = 0;

        do

        m[i] = new Middleschoolstudent("0", "0", "0", "0", "0", "0", "0", "0", "0");

        m[i].input();

        i  ;

        n  ;

        Console.WriteLine(" 是否繼續(xù)

        錄入檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        Console.WriteLine("共錄入"   n   "人");

        break;

        //錄入

        case 2:

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入您要刪除的學號");

        delet_number =

        Console.ReadLine();

        for (i = 0; i

        m[i].search_number(delet_number);

        if (m[i].getflag() == 1)                                                    

        for (j = i; j

        m[j] = m[j   1];

        n--;

        t  ;

        Console.WriteLine("正在刪除");

        Console.WriteLine("刪除成功");

        if (t == 0)

        Console.WriteLine("您刪除的學生的學生學號不存在");

        Console.WriteLine("是否繼續(xù)刪除是1否2");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        //刪除

        case 3:

        Console.WriteLine("

        ***************************************  ");

        Console.WriteLine("             通用學生信息管理修改            ");

        Console.WriteLine("

        ****************************************  ");

        Console.WriteLine("             1.英語              ");

        Console.WriteLine("             2.數(shù)學             ");

        Console.WriteLine("             3.語文             ");

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：");

        int number2 =

        int.Parse(Console.ReadLine());

        switch (number2)

        case 1:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的英語成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        m[i].search_number(find_number);

        if

        (m[i].getflag() == 1)

        m[i].input_englishScore();

        if (t == 0) Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)錄入檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 2:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的數(shù)學成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; im[i].search_number(find_number);

        if

        (m[i].getflag() == 1)

        m[i].input_mathScore(); 

        if (t == 0) Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 3:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的語文成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; im[i].search_number(find_number);

        if

        (m[i].getflag() == 1)

        m[i].input_chineseScore(); 

        if (t == 0) Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

         //修改

        case 4:

        Console.WriteLine("

        ****************************************  ");

        Console.WriteLine("             通用學生信息管理查詢             ");

        Console.WriteLine("

        ****************************************  ");

        Console.WriteLine("             1.學號             ");

        Console.WriteLine("             2.

        姓名             ");

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：");

        int number2 =

        int.Parse(Console.ReadLine());

        switch (number2)

        case 1:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要查找的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        if

        (m[i].getflag() == 1)

        m[i].showstudent();

        t  ;

        if (t == 0) Console.WriteLine("您要找的學號不存在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 2:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要查找的學生的姓名：");

        find_name = Console.ReadLine();

        for (i = 0; i

        if

        (m[i].getflag() == 1)

        m[i].showstudent();

        t  ;

        if (t == 0) Console.WriteLine("您要找的姓名不存在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        Console.WriteLine(" 是否繼續(xù)

        其他查詢方案檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 5:

        for (i = 0; i

        m[i].showstudent();

        break;

        Console.WriteLine(" 是否繼續(xù)其他查詢方案檔

        案？是1.否2.");

        judgestring = Console.ReadLine();

         while (judgestring == "1");

        break;

        case 3:

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：");

        int number1 = int.Parse(Console.ReadLine());                                 

        int judge = 0;

        switch (number1)

        case 1:

        i = 0;

        do

        s[i] = new Pupil("0", "0", "0", "0", "0", "0", "0", "0", "0");

        s[i].input();

        i  ;

        n  ;

        Console.WriteLine(" 是否繼續(xù)

        錄入檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        Console.WriteLine("共錄入"   n   "人");

        break;

        //錄入

        case 2:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入您要刪除的學號");

        delet_number =

        Console.ReadLine();

        for (i = 0; i

        s[i].search_number(delet_number);

        if (s[i].getflag() == 1)                                                    

        for (j = i; j

        s[j] = s[j   1];

        n--;

        t  ;

        Console.WriteLine("正在刪除");

        Console.WriteLine("刪除成功");

        if (t == 0)

        Console.WriteLine("您刪除的學生的學生學號不存在");

        Console.WriteLine("是否繼續(xù)刪除是1否2");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        //刪除

        case 3:

        Console.WriteLine("

        *****************************************  ");

        Console.WriteLine("

        通用學生信息管理修改             ");

        Console.WriteLine("

        ***************************************** ");

        Console.WriteLine("             1.英語              ");

        Console.WriteLine("             2.數(shù)學             ");

        Console.WriteLine("             3.語文             ");

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：");

        int number2 =

        int.Parse(Console.ReadLine());

        switch (number2)

        case 1:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的英語成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        s[i].search_number(find_number);

        if

        (s[i].getflag() == 1)

        s[i].input_englishScore();

        t  ;

        Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)錄入檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 2:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的數(shù)學成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        s[i].search_number(find_number);

        if

        (s[i].getflag() == 1)

        s[i].input_mathScore();

        t  ;

        if (t == 0) Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

        1);

        break;

        case 3:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要修改的語文成績的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        s[i].search_number(find_number);

        if

        (s[i].getflag() == 1)

        s[i].input_chineseScore();

        t  ;

        if (t == 0) Console.WriteLine("您查找的人不在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        Console.WriteLine(" 是否繼續(xù)

        檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

         //修改

        case 4:

        Console.WriteLine("

        ****************************************  ");

        Console.WriteLine("             通用學生信息管理查詢             ");

        Console.WriteLine("

        *****************************************  ");

        Console.WriteLine("             1.學號             ");

        Console.WriteLine("             2.姓名             ");

        do

        Console.WriteLine("請輸入你要選擇執(zhí)行的功能：");

        int number2 =

        int.Parse(Console.ReadLine());

        switch (number2)

        case 1:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要查找的學生的學號：");

        find_number = Console.ReadLine();

        for (i = 0; i

        if

        (s[i].getflag() == 1)

        s[i].showstudent();

        t  ;

        if (t == 0)

        Console.WriteLine("您要找的學號不存在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 2:

        do

        t = 0;

        judge = 0;

        Console.WriteLine("請輸入你要查找的學生的姓名：");

        find_name = Console.ReadLine();

        for (i = 0; i

        if

        (s[i].getflag() == 1)

        s[i].showstudent();

        t  ;

        if (t == 0) Console.WriteLine("您要找的姓名不存在");

        Console.WriteLine(" 是否繼續(xù)檔案？是1.否2.");

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        Console.WriteLine(" 是否繼續(xù)其他查詢方案檔案？是1.否2.");

        judge =

        int.Parse(Console.ReadLine());

         while (judge == 1);

        break;

        case 5:

        for (i = 0; i

        s[i].showstudent();

        break;

        Console.WriteLine(" 是否繼續(xù)其他查詢方案檔案？是1.否2.");

        judgestring = Console.ReadLine();

         while (judgestring == "1");

        break;