C#学员管理系统（源代码)

it2022-05-05 134

C#学员管理系统

C#学员管理系统是在控制台输出的项目，和OOP学员管理系统相似。

① 创建一个学员的实体类Student,实现其构造方法和封装：

using System; using System.Collections.Generic; using System.Linq; using System.Text; /// <summary> /// 实体类 /// </summary> namespace BaseXm { /// <summary> /// 学员的实体类 /// </summary> public class Student { /// <summary> /// 学号 /// </summary> private int _id; /// <summary> /// 姓名 /// </summary> private string _name; /// <summary> /// 年龄 /// </summary> private int _age; /// <summary> /// 性别 /// </summary> private string _sex; /// <summary> /// 分数 /// </summary> private int _grade; public override string ToString() { StringBuilder sb = new StringBuilder(); sb.Append("学号："); sb.Append(_id); sb.Append("，姓名："); sb.Append(_name); sb.Append("，年龄："); sb.Append(_age); sb.Append("，性别："); sb.Append(_sex); sb.Append("，分数"); sb.Append(_grade); return sb.ToString(); } public int Id { get { return _id; } set { _id = value; } } public string Name { get { return _name; } set { _name = value; } } public int Age { get { return _age; } set { _age = value; } } public string Sex { get { return _sex; } set { _sex = value; } } public int Grade { get { return _grade; } set { _grade = value; } } public Student(int _id, string _name, int _age, string _sex, int _grade) { this.Id = _id; this.Name = _name; this.Age = _age; this.Sex = _sex; this.Grade = _grade; } public Student() {} } }

② 写一个老师管理学员的接口ITeacher，写增删查改的方法：

using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; namespace BaseXM { /// <summary> /// 管理的接口类泛型 /// </summary> public interface ITeacher<T> where T : class { /// <summary> /// 增加学员 /// </summary> /// <param name="t">学员对象</param> void AddStudent(T t); /// <summary> /// 编辑修改学员 /// </summary> /// <param name="t">学号</param> void EditStudent(T t); /// <summary> /// 删除学员 /// </summary> /// <param name="i">学号</param> void DeleteStudent(int i); /// <summary> /// 查询单个学员根据id /// </summary> /// <param name="i"></param> T SelectStudentById(int i); /// <summary> /// 查询最高分或最低分学员 /// </summary> /// <param name="i"></param> ArrayList SelectMaxOrMin(int i); /// <summary> /// 查询总分与平均分 /// </summary> int[] SelectSumAndAvg(); /// <summary> /// 查询全部学员根据年龄或分数或学号排序 /// </summary> ArrayList SelectStudentAgeGradeId(string str); } }

③写学员管理的接口类 IStudent，实现老师的接口以及学员的实体类ITeacher：

using BaseXM; using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace BaseXm { /// <summary> /// 学员管理的接口类 /// </summary> public interface IStudent : ITeacher<Student> { } }

④实现学生管理的实现类，StudentManage，接着实现接口IStudent：

using BaseXm; using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; using System.Text.RegularExpressions; /// <summary> /// 实现类 /// </summary> namespace BaseXM { /// <summary> /// 学生管理实现类 /// </summary> public class StudentManage : IStudent { #region 正则表达式 /// <summary> /// 正则表达式 /// </summary> Regex reg = new Regex("^[0-9]+$"); #endregion #region 学员集合List /// <summary> /// 学员集合 List /// </summary> private static ArrayList ls = new ArrayList(); #endregion #region 登录信息增加学员集合数据AddStudents() /// <summary> /// 增加学员数据 /// </summary> public static void AddStudents() { //赋值 ls.Add(new Student(1, "拾亿", 18, "男", 136)); } #endregion #region 增加学员AddStudent(Student q) /// <summary> /// 增加学员 /// </summary> /// <param name="q"></param> public void AddStudent(Student q) { int i = 1; foreach (Student s in ls) { if (s.Id >= i) i = s.Id + 1; } q.Id = i; ls.Add(q); } #endregion #region 删除学员DeleteStudent(int i) /// <summary> /// 删除学员 /// </summary> /// <param name="i">学号</param> public void DeleteStudent(int i) { int p = 0; foreach (Student s in ls) { if (s.Id == i) { ls.Remove(s); break; } p++; } } #endregion #region 修改学员EditStudent(Student r) /// <summary> /// 修改学员 /// </summary> /// <param name="r">学员对象</param> public void EditStudent(Student r) { foreach (Student s in ls) { if (s.Id == r.Id) { s.Name = r.Name; s.Age = r.Age; s.Sex = r.Sex; s.Grade = r.Grade; break; } } } #endregion #region 登录界面 Login() public void Login() { while (true) { //Console.ForegroundColor = ConsoleColor.Blue; //设置字体颜色为蓝色 Console.WriteLine("《《《《《《--------------------------------------------------------------&&&&----欢迎您来到学员管理系统----&&&&-------------------------------------------------------------》》》》》》》"); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); Console.WriteLine("--------------------------------------------------------------------------- 此系统需要先登录后方可使用哦 ------------------------------------------------------------------------------"); Console.WriteLine(" ---- 请输入学号 ---- "); string sy = Console.ReadLine().Trim(); Console.WriteLine(" ---- 请输入姓名 ---- "); string wl = Console.ReadLine().Trim(); if (sy.Equals("1") && wl.Equals("拾忆")) { ShowMain(); } else { Console.WriteLine("学号或者姓名没有输入或者有误"); Login(); } break; } } #endregion #region 一级菜单界面 /// <summary> /// 一级菜单主界面 /// </summary> /// public void ShowMain() { while (true) { Console.ForegroundColor = ConsoleColor.Blue; //设置字体颜色为蓝色 Console.WriteLine(); Console.WriteLine("《《《《《《--------------------------------------------------------------&&&&----欢迎您来到学员管理系统----&&&&-------------------------------------------------------------》》》》》》》"); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); Console.WriteLine("--------------------------------------------------------------------------------- 本系统有如下操作 ------------------------------------------------------------------------------------"); Console.WriteLine(" ----1.教员界面---- "); Console.WriteLine(); Console.WriteLine(" ----2.学员界面---- "); Console.WriteLine(); Console.WriteLine(" ----3.退出学员管理系统---- "); Console.WriteLine(); Console.WriteLine(" ----《《《《请输入1--2的数字》》》》---- "); Console.WriteLine(); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string w = Console.ReadLine().Trim(); if (w.Equals("1")) { ShowMain11(); } else if (w.Equals("2")) { ShowMain12(); } else if (w.Equals("3")) { Console.WriteLine(" 退出成功！！！欢迎您再次使用哦 "); } else { Console.WriteLine(" 输入错误！！！请依据提示重新请输入1--3的数字哦 "); continue; } break; } } /// <summary> /// 一级菜单第一个教员查看信息 /// </summary> public void ShowMain11() { while (true) { Console.WriteLine(" ----1.查看学员信息---- "); Console.WriteLine(); Console.WriteLine(" ----2.增加学员信息---- "); Console.WriteLine(); Console.WriteLine(" ----3.修改学员信息---- "); Console.WriteLine(); Console.WriteLine(" ----4.删除学员信息---- "); Console.WriteLine(); Console.WriteLine(" ----5.返回上级菜单---- "); Console.WriteLine(); Console.WriteLine(" ----6.退出学员管理系统---- "); Console.WriteLine(); Console.WriteLine(" ----《《《《请输入1--5的数字》》》》---- "); Console.WriteLine(); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string x = Console.ReadLine().Trim(); if (x.Equals("1")) { ShowMain123(); } else if (x.Equals("2")) { ShowMain212(); } else if (x.Equals("3")) { ShowMain23(); } else if (x.Equals("4")) { ShowMain24(); } else if (x.Equals("5")) { ShowMain(); break; } else if (x.Equals("6")) { Console.WriteLine(" 退出成功！！！欢迎您再次使用哦 "); } else { Console.WriteLine(" 输入错误！！！请依据提示重新请输入1--5的数字哦 "); continue; } break; } } /// <summary> /// 一级菜单第二个学员查看信息 /// </summary> public void ShowMain12() { while (true) { Console.WriteLine(" ----1.查看学员信息---- "); Console.WriteLine(); Console.WriteLine(" ----2.退出学员管理系统---- "); Console.WriteLine(); Console.WriteLine(" ----3.返回上级菜单---- "); Console.WriteLine(); Console.WriteLine(" ----《《《《请输入1--2的数字》》》》---- "); Console.WriteLine(); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string x = Console.ReadLine().Trim(); if (x.Equals("1")) { ShowMain124(); } else if (x.Equals("2")) { Console.WriteLine(" 退出成功！！！欢迎您再次使用哦 "); break; } else if (x.Equals("3")) { ShowMain(); } else { Console.WriteLine(" 输入错误！！！请依据提示重新请输入1--2的数字哦 "); } break; } } #endregion #region 二级菜单第一个查看信息 /// <summary> /// 二级菜单第一个教员查看学员信息 /// </summary> /// private void ShowMain123() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.查看单个学员信息 "); Console.WriteLine(" 2.查看所有学员信息 "); Console.WriteLine(" 3.返回上级菜单 "); Console.WriteLine(" 请输入1--3的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string s = Console.ReadLine().Trim(); if (s.Equals("1")) { ShowMain31(); break; } else if (s.Equals("2")) { ShowMain32(); break; } else if (s.Equals("3")) { ShowMain11(); break; } else { Console.WriteLine(" 输入错误！！！请按提示重新请输入1--3的数字！！！ "); } } } /// <summary> /// 二级菜单第二个学员查看信息 /// </summary> private void ShowMain124() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.查看单个学员信息 "); Console.WriteLine(" 2.查看所有学员信息 "); Console.WriteLine(" 3.返回上级菜单 "); Console.WriteLine(" 请输入1--3的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string s = Console.ReadLine().Trim(); if (s.Equals("1")) { ShowMain311(); break; } else if (s.Equals("2")) { ShowMain322(); break; } else if (s.Equals("3")) { ShowMain12(); break; } else { Console.WriteLine(" 输入错误！！！请按提示重新请输入1--3的数字！！！ "); } } } #endregion #region 二级菜单第二个增加学员信息 /// <summary> /// 二级菜单第二个 /// </summary> private void ShowMain212() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.增加学员信息 "); Console.WriteLine(" 2.返回上级菜单 "); Console.WriteLine(" 请输入1--2的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string s = Console.ReadLine().Trim(); if (s.Equals("1")) { while (true) { Console.WriteLine(" 请输入您要增加的学员的姓名： "); string name = Console.ReadLine().Trim(); if (name.Length < 2 || name.Length > 20) { Console.WriteLine(" 姓名只能在2位到20位之间 "); Console.WriteLine(" 请输入a或其他任意字符退出 "); if (Console.ReadLine().Trim().Equals("a")) continue; } else { while (true) { Console.WriteLine(" 请输入您要增加的学员的年龄 "); string s2 = Console.ReadLine().Trim(); if (!reg.Match(s2).Success) { Console.WriteLine(" 输入的不是数字 "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Equals("1")) continue; } else { int age = int.Parse(s2); if (age < 10 || age > 50) { Console.WriteLine(" 年龄只能在10-50岁之间的整数 "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Equals("1")) continue; } else { while (true) { Console.WriteLine(" 请输入你要增加的学员的性别： "); string sex = Console.ReadLine(); if (!(sex.Equals("男") || sex.Equals("女"))) { Console.WriteLine(" 性别只能为男或者女哦 "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Trim().Equals("1")) continue; } else { while (true) { Console.WriteLine(" 请输入您要增加的学员的分数(0~150)： "); string s3 = Console.ReadLine().Trim(); Match ms2 = reg.Match(s3); if (!ms2.Success) { Console.WriteLine(" 输入的不是数字（0~150之间） "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Trim().Equals("1")) continue; } else { int grade = int.Parse(s3); if (grade > -1 && grade < 151) { Console.WriteLine("姓名：" + name + ",年龄：" + age + ",性别：" + sex + ",分数：" + grade); Console.WriteLine(" 您确认增加这位学员吗？请输入：1（确认）其它字符（取消） "); if (!Console.ReadLine().Trim().Equals("1")) { Console.WriteLine(" 取消成功 "); break; } AddStudent(new Student(0, name, age, sex, grade)); Console.WriteLine(" 增加成功 !!!! "); break; } else { Console.WriteLine(" 学员的分数在0-150分之间 "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Trim().Equals("1")) continue; } } break; } } break; } } } break; } } break; } } else if (s.Equals("2")) { ShowMain11(); return; } else { Console.WriteLine(" 请输入1--2的数字！！！ "); } } } #endregion #region 二级菜单第三个修改学员信息 void ShowMain23() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.输入要修改的学号 "); Console.WriteLine(" 2.返回上级菜单 "); Console.WriteLine(" 请输入1--2的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string s = Console.ReadLine().Trim(); if (s.Equals("1")) { while (true) { while (true) { Console.WriteLine(" 请输入您要修改的学员的学号（阿拉伯数字）： "); string t = Console.ReadLine().Trim(); if (!reg.Match(t).Success) { Console.WriteLine(" 请输入1--2的数字 "); break; } else { int id = int.Parse(t); Student x = SelectStudentById(id); if (x == null) { Console.WriteLine(" 教员没有添加此学号哦 "); break; } Console.WriteLine(" 原来的姓名：" + x.Name + " "); Console.WriteLine(" 请输入您要修改后的学员的姓名： "); string name = Console.ReadLine().Trim(); if (name.Length < 2 || name.Length > 20) { Console.WriteLine(" 姓名需要在2位到20位之间！！！ "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Trim().Equals("1")) continue; } else { while (true) { Console.WriteLine(" 原来年龄:" + x.Age + " "); Console.WriteLine(" 请输入您要修改后的学员的年龄 "); string s2 = Console.ReadLine().Trim(); if (!reg.Match(s2).Success) { Console.WriteLine(" 学员的年龄只能为10-50之间的数字 "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Equals("1")) continue; } else { int age = int.Parse(s2); if (age < 10 || age > 50) { Console.WriteLine(" 学员的年龄在10-50岁之间！！！ "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Equals("1")) continue; } else { while (true) { Console.WriteLine(" 原姓别：" + x.Sex + " "); Console.WriteLine(" 请输入修改后的学员的性别： "); string sex = Console.ReadLine(); if (!(sex.Equals("男") || sex.Equals("女"))) { Console.WriteLine(" 学员的性别只能位男或者女哦 "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Trim().Equals("1")) continue; } else { while (true) { Console.WriteLine(" 原分数：" + x.Grade + " "); Console.WriteLine(" 请输入修改后的学员的分数(0~150)： "); string s3 = Console.ReadLine().Trim(); Match ms2 = reg.Match(s3); if (!ms2.Success) { Console.WriteLine(" 学员的分数只能在0-150分之间的整数 "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Trim().Equals("1")) continue; } else { int grade = int.Parse(s3); if (grade > -1 && grade < 151) { Console.WriteLine(" 原信息：" + x + " "); Student y = new Student(x.Id, name, age, sex, grade); Console.WriteLine(" 修改后的信息：" + y + " "); Console.WriteLine(" 您确认修改这位学员吗？请输入：1（确认）0（取消） "); if (!Console.ReadLine().Trim().Equals("1")) { Console.WriteLine(" 取消成功！ "); break; } EditStudent(y); Console.WriteLine(" 修改成功！！！ "); break; } else { Console.WriteLine(" 学员的分数只能在0-150分之间的整数！！！ "); Console.WriteLine(" 请输入1或其他任意字符退出 "); if (Console.ReadLine().Trim().Equals("1")) continue; } } break; } } break; } } } break; } } } break; } break; } } else if (s.Equals("2")) { ShowMain11(); return; } else { Console.WriteLine(" 请输入1--2的数字哦！！！ "); } } } #endregion #region 二级菜单第四个删除学员信息 void ShowMain24() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.输入要删除的学号 "); Console.WriteLine(" 2.返回上级菜单 "); Console.WriteLine(" 请输入1--2的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string s = Console.ReadLine().Trim(); if (s.Equals("1")) { while (true) { Console.WriteLine(" 请输入你要删除的学员的学号(阿拉伯数字)： "); string a = Console.ReadLine().Trim(); if (!reg.Match(a).Success) { Console.WriteLine(" 请您输入学号数字哦！！！ "); break; } else { int id = int.Parse(a); Student student = SelectStudentById(id); if (student == null) { Console.WriteLine(" 教员没有添加此学号哦，学号为阿拉伯数字 "); } else { Console.WriteLine(student); Console.WriteLine(" 您确定要删除此位学员吗?请输入：1(确认) 其他(取消) "); if (Console.ReadLine().Trim().Equals("1")) { DeleteStudent(id); Console.WriteLine(" 删除成功! ！！ "); } else { Console.WriteLine(" 取消成功! ！！ "); } } } break; } } else if (s.Equals("2")) { ShowMain11(); break; } else { Console.WriteLine(" 输入错误！！！请输入1--2的数字哦 "); } } } #endregion #region 三级菜单第一个查看单个学员信息 /// <summary> /// 三级菜单第一个教员查看 /// </summary> private void ShowMain31() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.根据学号查看信息 "); Console.WriteLine(" 2.查看最高分学员 "); Console.WriteLine(" 3.查看最低分学员 "); Console.WriteLine(" 4.返回上级菜单 "); Console.WriteLine(" 请输入1--4的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); String s = Console.ReadLine().Trim(); if (s.Equals("1")) { Console.WriteLine(" 请输入您要查找的学生的学号： "); string s2 = Console.ReadLine().Trim(); if (s2.Length > 0) { Match ma = reg.Match(s2); if (ma.Success) { Student s3 = SelectStudentById(int.Parse(s2)); if (s3 == null) { Console.WriteLine(" 教员没有添加此学号哦 "); } else { Console.WriteLine(s3); } } else { Console.WriteLine(" 您输入的不是数字！！！请重新选择 "); } } else { Console.WriteLine(" 您输入的不是数字！！！请重新选择 "); } } else if (s.Equals("2")) { ArrayList al = SelectMaxOrMin(2); if (al.Count == 0) { Console.WriteLine(" 此系统教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("3")) { ArrayList al = SelectMaxOrMin(1); if (al.Count == 0) { Console.WriteLine(" 您输入的学号不存在！教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("4")) { ShowMain123(); break; } else { Console.WriteLine(" 输入错误！请输入1--4的数字！！！ "); } } } /// <summary> /// 三级菜单第一1个学员查看 /// </summary> private void ShowMain311() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.根据学号查看信息 "); Console.WriteLine(" 2.查看最高分学员 "); Console.WriteLine(" 3.查看最低分学员 "); Console.WriteLine(" 4.返回上级菜单 "); Console.WriteLine(" 请输入1--4的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); String s = Console.ReadLine().Trim(); if (s.Equals("1")) { Console.WriteLine(" 请输入您要查找的学生的学号： "); string s2 = Console.ReadLine().Trim(); if (s2.Length > 0) { Match ma = reg.Match(s2); if (ma.Success) { Student s3 = SelectStudentById(int.Parse(s2)); if (s3 == null) { Console.WriteLine(" 您输入的学号不存在！教员没有添加此学生哦 "); } else { Console.WriteLine(s3); } } else { Console.WriteLine(" 您输入的不是数字！！！请重新选择 "); } } else { Console.WriteLine(" 您输入的不是数字！！！请重新选择 "); } } else if (s.Equals("2")) { ArrayList al = SelectMaxOrMin(2); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("3")) { ArrayList al = SelectMaxOrMin(1); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("4")) { ShowMain124(); break; } else { Console.WriteLine(" 输入错误！请输入1--4的数字！！！ "); } } } #endregion #region 查询单个学员根据学号SelectStudentById(int i) /// <summary> /// 查询单个学员根据学号 /// </summary> /// <param name="i">学号</param> public Student SelectStudentById(int i) { foreach (Student s in ls) { if (s.Id == i) { return s; } } return null; } #endregion #region 查询单个学员最高分或最低分学员SelectMaxOrMin(int i) /// <summary> /// 查询最高分或最低分学员 /// </summary> /// <param name="i">1代表最低分，2代表最高分</param> public ArrayList SelectMaxOrMin(int i) { ArrayList ls2 = new ArrayList(); int y = i == 1 ? 1000 : -1; if (i == 1) { foreach (Student s in ls) { if (s.Grade < y) { y = s.Grade; } } } else { foreach (Student s in ls) { if (s.Grade > y) { y = s.Grade; } } } foreach (Student s in ls) { if (s.Grade == y) { ls2.Add(s); } } return ls2; } #endregion #region 三级菜单第二个查看所有学员信息 /// <summary> /// 三级菜单第二个教员查看 /// </summary> private void ShowMain32() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.根据年龄排序 "); Console.WriteLine(" 2.根据分数排序 "); Console.WriteLine(" 3.根据学号排序 "); Console.WriteLine(" 4.查看总分与平均分 "); Console.WriteLine(" 5.返回上级菜单 "); Console.WriteLine(" 请输入1--5的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string s = Console.ReadLine().Trim(); if (s.Equals("1")) { ArrayList al = SelectStudentAgeGradeId("age"); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("2")) { ArrayList al = SelectStudentAgeGradeId("grade"); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("3")) { ArrayList al = SelectStudentAgeGradeId("id"); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("4")) { ArrayList al = SelectStudentAgeGradeId("id"); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { int[] i = SelectSumAndAvg(); Console.WriteLine("总分：" + i[0] + "，平均分：" + i[1]); } } else if (s.Equals("5")) { ShowMain123(); break; } else { Console.WriteLine(" 输入错误！请输入1--5的数字 "); } } } /// <summary> /// 三级菜单第二1个教员查看 /// </summary> private void ShowMain322() { while (true) { Console.WriteLine("%----------------------------%"); Console.WriteLine(" 1.根据年龄排序 "); Console.WriteLine(" 2.根据分数排序 "); Console.WriteLine(" 3.根据学号排序 "); Console.WriteLine(" 4.查看总分与平均分 "); Console.WriteLine(" 5.返回上级菜单 "); Console.WriteLine(" 请输入1--5的数字 "); Console.WriteLine("---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"); string s = Console.ReadLine().Trim(); if (s.Equals("1")) { ArrayList al = SelectStudentAgeGradeId("age"); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("2")) { ArrayList al = SelectStudentAgeGradeId("grade"); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("3")) { ArrayList al = SelectStudentAgeGradeId("id"); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { foreach (Student student in al) { Console.WriteLine(student); } } } else if (s.Equals("4")) { ArrayList al = SelectStudentAgeGradeId("id"); if (al.Count == 0) { Console.WriteLine(" 教员没有添加此学生哦 "); } else { int[] i = SelectSumAndAvg(); Console.WriteLine("总分：" + i[0] + "，平均分：" + i[1]); } } else if (s.Equals("5")) { ShowMain124(); break; } else { Console.WriteLine(" 输入错误！请输入1--5的数字 "); } } } #endregion #region 查询所有学员并根据年龄或分数或学号排序 SelectStudentAgeGradeId(string str) /// <summary> /// 查询所有学员并根据年龄或分数或学号排序 /// </summary> public ArrayList SelectStudentAgeGradeId(string str) { //年龄排序 if (str.Equals("age")) { for (int i = 0; i < ls.Count - 1; i++) { for (int y = i + 1; y < ls.Count; y++) { Student s = (Student)ls[i]; Student s2 = (Student)ls[y]; if (s.Age < s2.Age) { Student s3 = s; ls[i] = s2; ls[y] = s3; } } } } //分数排序 else if (str.Equals("grade")) { for (int i = 0; i < ls.Count - 1; i++) { for (int y = i + 1; y < ls.Count; y++) { Student s = (Student)ls[i]; Student s2 = (Student)ls[y]; if (s.Grade < s2.Grade) { Student s3 = s; ls[i] = s2; ls[y] = s3; } } } } else { //学号排序 for (int i = 0; i < ls.Count - 1; i++) { for (int y = i + 1; y < ls.Count; y++) { Student s = (Student)ls[i]; Student s2 = (Student)ls[y]; if (s.Id > s2.Id) { Student s3 = s; ls[i] = s2; ls[y] = s3; } } } } return ls; } #endregion #region 查询总分和平均分SelectSumAndAvg() /// <summary> /// 查询总分和平均分，先返回总分再返回平均分 /// </summary> public int[] SelectSumAndAvg() { int[] x = new int[2]; int sum = 0; foreach (Student s in ls) { sum += s.Grade; } x[0] = sum; x[1] = sum / ls.Count; return x; } #endregion } }

⑤测试类Program

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace BaseXM { class Program { static void Main(string[] args) { StudentManage.AddStudents(); StudentManage sm = new StudentManage(); sm.Login(); Console.ReadKey(); } } }

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