C#实现简单的学生管理系统增删改查
1.Programs.cs
定义了增删改查的方法，使用Dictionary
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace StudentSystem
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("欢迎使用2018级学生管理系统");
Console.WriteLine("===============================================");
Console.WriteLine("请选择如下操作：");
Console.WriteLine("A：添加 B：查询 C:删除 D：修改 E退出系统");
string ch;
// Hashtable stu = new Hashtable();
Dictionary stu = new Dictionary();
Student student=new Student();
Console.Write("请输入选择功能：");
ch = Console.ReadLine();
while(ch!="E")
{
switch (ch)
{
case "A":
AddStudent(stu);
break;
case "B":
QueryStudent(stu);
break;
case "C":
DeleteStudent(stu);
break;
case "D":
UpdateStudent(stu);
break;
case "E":
break;
}
Console.Write("请输入选择功能：");
ch = Console.ReadLine();
}
foreach(KeyValuePair de in stu)
{
Console.WriteLine(de.Value);
}
// Console.WriteLine(student.showMSG());
Console.ReadLine();
}
public static void AddStudent(Dictionary dic)
{
string stuID;
Console.WriteLine("请输入添加学生信息：");
Console.WriteLine("请输入学生学号：");
stuID = Console.ReadLine();
while (dic.ContainsKey(stuID))
{
Console.WriteLine("该学生已存在，请重新输入：");
stuID = Console.ReadLine();
}
Student student = new Student();
Console.WriteLine("请输入学生姓名：");
string Name = Console.ReadLine();
Console.WriteLine("请输入学生性别：");
string Sex = Console.ReadLine();
Console.WriteLine("请输入学生班级：");
string Class = Console.ReadLine();
Console.WriteLine("请输入学生语文成绩：");
double Chinese = double.Parse(Console.ReadLine());
Console.WriteLine("请输入学生数学成绩：");
double Math = double.Parse(Console.ReadLine());
Console.WriteLine("请输入学生英语成绩：");
double English = double.Parse(Console.ReadLine());
student.setStuID(stuID);
student.setName(Name);
student.setSex(Sex);
student.setClass(Class);
student.setChinese(Chinese);
student.setMath(Math);
student.setEnglish(English);
dic.Add(stuID, student);
Console.WriteLine("添加学生成功");
}
public static void QueryStudent(Dictionary dic)
{
string stuID;
Student student = new Student();
Console.WriteLine("请输入查询学生的学号：");
stuID = Console.ReadLine();
while (!dic.ContainsKey(stuID))
{
Console.WriteLine("该学生不存在，请重新输入:");
stuID=Console.ReadLine();
}
dic[stuID].showMSG();
}
public static void DeleteStudent(Dictionary dic)
{
string stuID;
Console.WriteLine("请输入删除学生的学号：");
stuID = Console.ReadLine();
while (!dic.ContainsKey(stuID))
{
Console.WriteLine("该学生不存在，请重新输入:");
stuID=Console.ReadLine();
}
dic.Remove(stuID);
Console.WriteLine("成功删除。");
}
public static void UpdateStudent(Dictionary dic)
{
string stuID;
string id;
Console.WriteLine("请输入修改学生的学号：");
stuID = Console.ReadLine();
while (!dic.ContainsKey(stuID))
{
Console.WriteLine("该学生不存在，请重新输入:");
stuID = Console.ReadLine();
}
Console.WriteLine("1.修改姓名 2.修改性别 3.修改班级 4.修改语文成绩 5.修改数学成绩 6.修改英语成绩");
Console.WriteLine("请输入选择修改的序号：");
id = Console.ReadLine();
switch(id)
{
case "1":
Console.WriteLine("请输入学生姓名：");
string Name = Console.ReadLine();
dic[stuID].setName(Name);
break;
case "2":
Console.WriteLine("请输入学生性别：");
string Sex = Console.ReadLine();
dic[stuID].setSex(Sex);
break;
case "3":
Console.WriteLine("请输入学生班级：");
string Class = Console.ReadLine();
dic[stuID].setClass(Class);
break;
case "4":
Console.WriteLine("请输入学生语文成绩：");
double Chinese = double.Parse(Console.ReadLine());
dic[stuID].setChinese(Chinese);
break;
case "5":
Console.WriteLine("请输入学生数学成绩：");
double Math = double.Parse(Console.ReadLine());
dic[stuID].setMath(Math);
break;
case "6":
Console.WriteLine("请输入学生英语成绩：");
double English = double.Parse(Console.ReadLine());
dic[stuID].setEnglish(English);
break;
}
}
}
}
2.Student.cs(学生类)
学生类中定义了几种常见属性，以及一个计算平均值的方法和一个输出的方法。在Program.cs中实例化该类的对象即可调用该方法。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace StudentSystem
{
class Student
{
string stuID;
string Name;
string Sex;
string Class;
double Chinese;
double Math;
double English;
public Student(string stuID, string Name, string Sex, string Class, double Chinese, double Math, double English)
{
this.stuID = stuID;
}
public Student()
{ }
public void setStuID(string stuID)
{
this.stuID = stuID;
}
public void setName(string Name)
{
this.Name = Name;
}
public void setSex(string Sex)
{
this.Sex = Sex;
}
public void setClass(string Class)
{
this.Class = Class;
}
public void setChinese(double Chinese)
{
this.Chinese = Chinese;
}
public void setMath(double Math)
{
this.Math = Math;
}
public void setEnglish(double English)
{
this.English = English;
}
public double ComputeAvg(double Chinese, double Math, double English)
{
this.Chinese = Chinese;
this.Math = Math;
this.English = English;
double sum, avg;
sum = Chinese + Math + English;
avg = sum / 3;
return avg;
}
public void showMSG()
{
Console.WriteLine(" 学号：" + stuID + " 姓名：" + Name + " 班级 "+Class+" 性别 " + Sex + " 语文" + Chinese + " 数学" + Math + "英语 " + English+" 平均成绩 "+ ComputeAvg(Chinese,Math,English));
}
}
}