C#学生管理系统/学习

题目：

实现一个菜单，针对Student.txt与Class.txt文件进行操作

描述：

I 输入学生信息：输入学生学号、姓名、性别、出生日期、班级名称、联系电话，跟已经存在的学生信息同样格式保存在文件中。如果学号重复，则提示“学号重复，无法插入”
L 显示所有学生：每个学生的信息占一行；每个学生的信息项包括学号、姓名、性别、出生日期、班级名称、联系电话，各项以Tab分隔
C 按班级查询：输入班级名称，显示学生详细信息，包括学号、姓名、性别、联系电话，各项以Tab分隔。多人分行显示。
N 按姓名查询：输入学生姓名，显示学生详细信息，包括学号、姓名、性别、出生日期、班级名称、联系电话，各项以Tab分隔。多人分行显示。
X 退出系统：程序退出

总结：

主要是对文件进行操作。没什么好说的。

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace NET第二次作业
{
    public class Student
    {
        public String num;
        public String name;
        public String sex;
        public String date_of_birth;
        public String classId;
        public String className;
        public String telephone;
    }
    public class myClass
    {
        public String id;
        public String classname;
    }
    class MyFourTest
    {
        static List<Student> students = new List<Student>();
        static List<myClass> myClasss = new List<myClass>();  
        public static void Init()
        {

            List<String> student_p = new List<string>();
            StreamReader student = new StreamReader("C:\Users\a1191\Desktop\student.txt", Encoding.Default);
           
            while (!student.EndOfStream)
            {
                student_p.Add(student.ReadLine());
               // Console.WriteLine(student_p[i++]+"a");
            }
            for(int j=0; j<student_p.Count; j++)
            {
                string[] arr = student_p[j].Split(',');
                if(arr[0]!="")
                {
                    Student student1 = new Student();
                    student1.num = arr[0];
                    student1.name = arr[1];
                    student1.sex = arr[2];
                    student1.date_of_birth = arr[3];
                    student1.classId = arr[4];
                    student1.telephone = arr[5];
                    students.Add(student1);
                }

            }
            student.Close();
            
            StreamReader streamReader = new StreamReader("C:\Users\a1191\Desktop\class.txt", Encoding.Default);
            while (!streamReader.EndOfStream)
            {
                String class_ = streamReader.ReadLine();
                string[] arr = class_.Split(',');
                myClass t = new myClass();
                t.classname = arr[1];
                t.id = arr[0];
                myClasss.Add(t);
                for(int i=0; i<students.Count; i++)
                {
                    if(students[i].classId.Equals(arr[0]))
                    {
                            students[i].className = arr[1];
                        //Console.WriteLine(arr[0]);
                    }
                }
            }
            streamReader.Close();
        }

        public static void saveInfo(Student t)
        {
            StreamWriter student = new StreamWriter("C:\Users\a1191\Desktop\student.txt", true);
            //StreamWriter streamReader = new StreamWriter("C:\Users\a1191\Desktop\class.txt", true);
            String s = t.num + ',' + t.name + ',' + t.sex + ',' + t.date_of_birth + ',' + t.classId + ',' + t.telephone;
            student.WriteLine(s);
            //String c = t.classId + ',' + t.className + ",2005";
            //streamReader.WriteLine(c);
            student.Close();
            //streamReader.Close();
        }
        public static void InputStudentInfo()
        {
            Student t = new Student();
            Console.WriteLine("请输入学号：");
            t.num = Console.ReadLine();
            for(int i=0; i<students.Count; i++)
            {
                if(t.num.Equals(students[i].num))
                {
                    Console.WriteLine("学号重复，无法插入");
                    return;
                }
            }
            Console.WriteLine("请输入姓名：");
            t.name = Console.ReadLine();
            Console.WriteLine("请输入性别：");
            t.sex = Console.ReadLine();
            Console.WriteLine("请输入出生日期：");
            t.date_of_birth = Console.ReadLine();
            Console.WriteLine("请输入班级名称：");
            t.className = Console.ReadLine();
            Console.WriteLine("请输入联系电话：");
            t.telephone = Console.ReadLine();
            for(int i=0; i<myClasss.Count; i++)
            {
                if(t.className.Equals(myClasss[i].classname))
                {
                    t.classId = myClasss[i].id;
                }
            }
            students.Add(t);
            //for(int i=0; i<students.Count; i++)
            //{
            //    Console.WriteLine(students[i].className);
            //}

            saveInfo(t);
        }
        public static void ShowAllStudent()
        {
            Console.WriteLine("学号	姓名	性别	出生日期	班级名称		联系电话");
            for(int i=0; i<students.Count; i++)
            {
                Console.WriteLine(students[i].num + "	"+ students[i].name + "	"+ students[i].sex + 
                    "	"+ students[i].date_of_birth + "	"+ students[i].className + "	" +students[i].telephone);
            }
        }
        public static void GetStudentByClass()
        {
            Console.WriteLine("请输入要查询的班级名称：");
            String name = Console.ReadLine();
            Console.WriteLine("学号	姓名	性别	联系电话");
            for (int i = 0; i < students.Count; i++)
            {
                if(students[i].className.Equals(name))
                {
                    Console.WriteLine(students[i].num + "	" + students[i].name + "	" + students[i].sex +
                        "	"   + students[i].telephone);
                }
            }
        }
        public static void GetStudentByName()
        {
            Console.WriteLine("请输入要查询的学生姓名：");
            String name = Console.ReadLine();
            Console.WriteLine("学号	姓名	性别	出生日期	班级名称		联系电话");
            for (int i = 0; i < students.Count; i++)
            {
                if (students[i].name.Equals(name))
                {
                    Console.WriteLine(students[i].num + "	" + students[i].name + "	" + students[i].sex +
                        "	" + students[i].date_of_birth + "	" + students[i].className + "	" + students[i].telephone);
                }
            }
        }

        public static void StudentTest()
        {
            
            Init();
            while (true)
            {
                ConsoleKeyInfo cmd;
                Console.WriteLine("欢迎使用学生管理系统
");
                Console.WriteLine("I  输入学生信息
");
                Console.WriteLine("L  显示所有学生
");
                Console.WriteLine("C  按班级查询
");
                Console.WriteLine("N  按姓名查询
");
                Console.WriteLine("X  退出系统
");
                cmd =  Console.ReadKey();
                Console.WriteLine("");
                switch (cmd.KeyChar)
                {
                    case 'I':
                        InputStudentInfo();
                        break;
                    case 'L':
                        ShowAllStudent();
                        break;
                    case 'C':
                        GetStudentByClass();
                        break;
                    case 'N':
                        GetStudentByName();
                        break;
                    case 'X':
                        System.Environment.Exit(0);
                        break;
                    default:
                        Console.WriteLine("
请输入指定字符（区分大小写）
");
                        break;
                }
                Console.ReadKey();
                Console.Clear();
            }


        }

    }
}