using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;namespace _3.List学生管理系统
{internal class Program{static List<Student> list = new List<Student>{new Student(){Id = 1,Name ="凡凡",Age =24,Gender ="男" ,Height=1.80},new Student(){Id = 3,Name ="爽爽",Age =18,Gender ="女" ,Height=1.73},new Student(){Id = 2,Name ="坤坤",Age =21,Gender ="男" ,Height=1.70}};static MyComparer<Student> comparer = new MyComparer<Student>();static void Main(string[] args){while (true){Console.WriteLine("输入你需要的功能\n1.添加 2.删除 3.显示所有 4.查找单个 5.修改 6.排序 7.退出");string a=Console.ReadLine();switch (a){case "1":AddStudent();Console.WriteLine("添加操作完成");break;case "2":Console.WriteLine("输入你需要删除的学生学号");string id1 =Console.ReadLine() ;Cunzai(id1);DeleteStudent(id1);Console.WriteLine("删除操作完成");break;case "3":DisplayStudent();Console.WriteLine("显示所有学生操作完成");break;case "4":Console.WriteLine("输入单个查询的学生学号");string id=Console.ReadLine();Cunzai(id);SearchStudent(id);Console.WriteLine("查询单个学生操作完成");break;case "5":Console.WriteLine("输入修改信息的学生学号");string id2 = Console.ReadLine();Cunzai(id2);ModifyStudent(id2);Console.WriteLine("修改单个学生操作完成");break;case "6":Console.WriteLine("输入你需要的选项:1.根据学号排序 2.根据年龄排序 3.根据身高排序");string b=Console.ReadLine();Paixu(b);break;case "7":Console.WriteLine("退出成功");return;default:Console.WriteLine("你输入的不符合规范");break;}}}/// <summary>/// 根据输入的选项对学生排序/// </summary>/// <param name="pai"></param>static void Paixu(string pai){switch (pai){case "1":comparer.Sort(list);DisplayStudent1(list);Console.WriteLine("根据学号排序操作完成");break;case "2":comparer.Sort1(list);DisplayStudent1(list);Console.WriteLine("根据年龄排序操作完成");break;case "3":comparer.Sort2(list);DisplayStudent1(list);Console.WriteLine("根据身高排序操作完成");break;default:Console.WriteLine("输入的选项不存在");break;}}/// <summary>/// 显示排序后的学生/// </summary>/// <param name="list"></param>static void DisplayStudent1(List<Student> list){foreach (var item in list){Console.WriteLine(item);}}/// <summary>/// 确保学号唯一性/// </summary>/// <param name="id"></param>/// <returns></returns>static string Weiyi(string id){if (id != ""){foreach (var item in list){if (item.Id == int.Parse(id)){return "false";}}}else{return "-1";}return "true";}/// <summary>/// 检查该学号学生是否存在/// </summary>/// <param name="id">输入的学号</param>static void Cunzai(string id){if(Weiyi(id)=="true"){Console.WriteLine("该学号不存在");return;}else if(Weiyi(id)=="-1"){throw new Exception("请不要输入空字符串");}}/// <summary>/// 添加学生/// </summary>static void AddStudent(){Console.WriteLine("输入学号");string id=Console.ReadLine();Console.WriteLine("输入姓名");string name = Console.ReadLine();Console.WriteLine("输入年龄");string age = Console.ReadLine();Console.WriteLine("输入性别(女:0\t男:1)");string gender = Console.ReadLine();Console.WriteLine("输入身高(m)");string height=Console.ReadLine();try{if(Weiyi(id)=="true"){if(double.Parse(height)>2.50){Console.WriteLine("身高输入不符合规范");return;}Student student = new Student(){Id = int.Parse(id),Name = name,Age = int.Parse(age),Gender = gender == "0" ? "女" : "男",Height=double.Parse(height)};list.Add(student);Console.WriteLine("添加成功");}else{Console.WriteLine("此学号已被使用,添加失败");}}catch {Console.WriteLine("输入格式有误");}}/// <summary>/// 显示所有学生/// </summary>static void DisplayStudent(){var student =from x in listselect x.ToString();foreach (var item in student){Console.WriteLine(item.ToString());}}/// <summary>/// 删除单个学生/// </summary>static void DeleteStudent(string id){for (int i = 0; i <list.Count; i++){if (list[i].Id==int.Parse(id)){list.RemoveAt(i);Console.WriteLine("删除成功");}}}/// <summary>/// 显示单个学生信息/// </summary>/// <param name="id"></param>static void SearchStudent(string id){var student = from x in listwhere x.Id == int.Parse(id)select x;foreach (var item in student){Console.WriteLine(item.ToString());}}/// <summary>/// 修改单个学生信息/// </summary>/// <param name="id"></param>static void ModifyStudent(string id){for (int i = 0; i < list.Count; i++){if (list[i].Id == int.Parse(id)){Console.WriteLine("不修改的信息直接跳过");Console.WriteLine("输入修改的姓名");string name = Console.ReadLine();Console.WriteLine("输入修改的年龄");string age = Console.ReadLine();Console.WriteLine("输入修改的性别(女:0\t男:1)");string gender = Console.ReadLine();Console.WriteLine("输入身高(m)");string height = Console.ReadLine();try{if (double.Parse(height) > 2.50){Console.WriteLine("身高输入不符合规范");return;}list[i].Name = name == "" ? list[i].Name : name;list[i].Age = age == "" ? list[i].Age : int.Parse(age);list[i].Gender = gender == "" ? list[i].Gender : gender == "0" ? "女" : "男";list[i].Height = height == "" ? list[i].Height : double.Parse(height);Console.WriteLine("修改成功");}catch (Exception){Console.WriteLine("修改输入格式有误");}}}}}}

创建的学生类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace _3.List学生管理系统
{public interface IComParable<T>                 //接口{int ComPareTo(T other);                     //在list的数组中,想对几种数据进行排列,就要写几个方法int ComPareTo1(T other);                    //这里以三种数据举例:分别是学生的ID,学生的年龄,学生的身高int ComPareTo2(T other);}public class Student:IComParable<Student>       //继承接口的学生类{public int Id { get; set; }                 //学生的学号public string Name { get; set; }public int Age { get; set; }                //学生的年龄public string Gender { get; set; }public double Height { get; set; }          //学生的身高//public Student(int id, string name, int age, string gender)  这里作者不需要构造函数所以就注释掉了//{//    Id = id;//    Name = name;//    Age = age;//    Gender = gender;//}/// <summary>/// 根据ID排序/// </summary>/// <param name="other">传入学生类</param>/// <returns>返回排序结果</returns>public int ComPareTo(Student other)         //根据ID排列{if (other == null) return 1;return this.Id.CompareTo(other.Id);}/// <summary>/// 根据年龄排序/// </summary>/// <param name="other"></param>/// <returns></returns>                 public int ComPareTo1(Student other)        //根据年龄排列{if (other == null) return 1;return this.Age.CompareTo(other.Age);}/// <summary>/// 根据身高排序/// </summary>/// <param name="other"></param>/// <returns></returns>public int ComPareTo2(Student other)        //根据身高排列{if (other == null) return 1;return this.Height.CompareTo(other.Height);}public override string ToString()           //对ToString进行重写{return $"学号:{Id}\t姓名:{Name}\t年龄:{Age}\t性别:{Gender}\t身高{String.Format("{0:F2}",Height)}米";}}/// <summary>/// 使用接口的约束/// </summary>/// <typeparam name="T"></typeparam>internal class MyComparer<T> where T : IComParable<T>{//对列表进行排序public void Sort(List<T> list)              //根据ID排列{//Sort可以立即为只能对值类型的数据进行比较,没办法比较复杂类型list.Sort((x, y) => x.ComPareTo(y));}public void Sort1(List<T> list)             //根据年龄排列{//Sort可以立即为只能对值类型的数据进行比较,没办法比较复杂类型list.Sort((x, y) => x.ComPareTo1(y));}public void Sort2(List<T> list)             //根据身高排列{//Sort可以立即为只能对值类型的数据进行比较,没办法比较复杂类型list.Sort((x, y) => x.ComPareTo2(y));}}
}