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24 changes: 24 additions & 0 deletions Homework/Homework.sln
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.5.2.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Homework", "Homework.csproj", "{839F0D47-7720-9DE6-F7A0-D82926C48D6D}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{839F0D47-7720-9DE6-F7A0-D82926C48D6D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{839F0D47-7720-9DE6-F7A0-D82926C48D6D}.Debug|Any CPU.Build.0 = Debug|Any CPU
{839F0D47-7720-9DE6-F7A0-D82926C48D6D}.Release|Any CPU.ActiveCfg = Release|Any CPU
{839F0D47-7720-9DE6-F7A0-D82926C48D6D}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {9DCA6D3A-198B-4B94-870D-99B0281A8AC5}
EndGlobalSection
EndGlobal
198 changes: 164 additions & 34 deletions Homework/Program.cs
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Expand Up @@ -9,43 +9,62 @@ namespace StudentManagementSystem
public enum Grade
{
// TODO: 定义成绩等级 F(0), D(60), C(70), B(80), A(90)

F = 0,
D = 60,
C = 70,
B = 80,
A = 90
}

// 泛型仓储接口
public interface IRepository<T>
{
// TODO: 定义接口方法
// Add(T item)
void Add(T item);
// Remove(T item) 返回bool
bool Remove(T item);
// GetAll() 返回List<T>
List<T> GetAll();
// Find(Func<T, bool> predicate) 返回List<T>

List<T> Find(Func<T, bool> predicate);
}

// 学生类
public class Student : IComparable<Student>
{
// TODO: 定义字段 StudentId, Name, Age


public string StudentId { get; set; }
public string Name { get; set; }
public int Age { get; set; }

public Student(string studentId, string name, int age)
{
// TODO: 实现构造方法，包含参数验证（空值检查）

if (string.IsNullOrWhiteSpace(studentId))
throw new ArgumentException("学号不能为空", nameof(studentId));
if (string.IsNullOrWhiteSpace(name))
throw new ArgumentException("姓名不能为空", nameof(name));
if (age <= 0)
throw new ArgumentException("年龄必须大于0", nameof(age));

StudentId = studentId;
Name = name;
Age = age;
}

public override string ToString()
{
// TODO: 返回格式化的学生信息字符串

return $"学号: {StudentId}, 姓名: {Name}, 年龄: {Age}";
}

// TODO: 实现IComparable接口，按学号排序
// 提示：使用string.Compare方法
public int CompareTo(Student? other)
{

if (other == null) return 1;
return string.Compare(this.StudentId, other.StudentId, StringComparison.Ordinal);
}

public override bool Equals(object? obj)
Expand All @@ -63,18 +82,25 @@ public override int GetHashCode()
public class Score
{
// TODO: 定义字段 Subject, Points

public string Subject { get; set; }
public double Points { get; set; }

public Score(string subject, double points)
{
// TODO: 实现构造方法，包含参数验证

if (string.IsNullOrWhiteSpace(subject))
throw new ArgumentException("科目不能为空", nameof(subject));
if (points < 0 || points > 100)
throw new ArgumentException("成绩必须在0到100之间", nameof(points));

Subject = subject;
Points = points;
}

public override string ToString()
{
// TODO: 返回格式化的成绩信息

return $"科目: {Subject}, 成绩: {Points}";
}
}

Expand All @@ -83,39 +109,55 @@ public class StudentManager : IRepository<Student>
{
// TODO: 定义私有字段存储学生列表
// 提示：使用List<Student>存储

private List<Student> students = new List<Student>();

public void Add(Student item)
{
// TODO: 实现添加学生的逻辑
// 1. 参数验证
// 2. 添加到列表

if (item == null) throw new ArgumentNullException(nameof(item));
if (students.Exists(s => s.StudentId == item.StudentId))
throw new ArgumentException("学号已存在");
students.Add(item);
}

public bool Remove(Student item)
{
// TODO: 实现Remove方法

return students.Remove(item);
}

public List<Student> GetAll()
{
// TODO: 返回学生列表的副本
return new List<Student>(students);

}

public List<Student> Find(Func<Student, bool> predicate)
{
// TODO: 使用foreach循环查找符合条件的学生

var result = new List<Student>();
foreach (var student in students)
{
if (predicate(student))
result.Add(student);
}
return result;
}

// 查找年龄在指定范围内的学生
public List<Student> GetStudentsByAge(int minAge, int maxAge)
{
// TODO: 使用foreach循环和if判断实现年龄范围查询

var result = new List<Student>();
foreach (var student in students)
{
if (student.Age >= minAge && student.Age <= maxAge)
result.Add(student);
}
return result;
}
}

Expand All @@ -124,41 +166,74 @@ public class ScoreManager
{
// TODO: 定义私有字段存储成绩字典
// 提示：使用Dictionary<string, List<Score>>存储

private Dictionary<string, List<Score>> scores = new Dictionary<string, List<Score>>();

public void AddScore(string studentId, Score score)
{
// TODO: 实现添加成绩的逻辑
// 1. 参数验证
// 2. 初始化学生成绩列表（如不存在）
// 3. 添加成绩

}
public void AddScore(string studentId, Score score)
{
// TODO: 实现添加成绩的逻辑
// 1. 参数验证
if (string.IsNullOrWhiteSpace(studentId))
throw new ArgumentException("学生ID不能为空", nameof(studentId));
if (score == null)
throw new ArgumentNullException(nameof(score));
// 2. 初始化学生成绩列表（如不存在）
if (!scores.ContainsKey(studentId))
scores[studentId] = new List<Score>();
// 3. 添加成绩
scores[studentId].Add(score);
}

public List<Score> GetStudentScores(string studentId)
{
// TODO: 获取指定学生的所有成绩

if (string.IsNullOrWhiteSpace(studentId))
throw new ArgumentException("学生ID不能为空", nameof(studentId));
if (scores.ContainsKey(studentId))
return new List<Score>(scores[studentId]);
return new List<Score>();
}

public double CalculateAverage(string studentId)
{

// TODO: 计算指定学生的平均分
// 提示：使用foreach循环计算总分，然后除以科目数

if (string.IsNullOrWhiteSpace(studentId)) throw new ArgumentException("学生ID不能为空");
if (!scores.ContainsKey(studentId) || scores[studentId].Count == 0)
return 0;
double total = 0;
foreach (var score in scores[studentId])
{
total += score.Points;
}
return total / scores[studentId].Count;
}

// TODO: 使用模式匹配实现成绩等级转换
public Grade GetGrade(double score)
{

return score switch
{
>= 90 => Grade.A,
>= 80 => Grade.B,
>= 70 => Grade.C,
>= 60 => Grade.D,
_ => Grade.F,
};
}

public List<(string StudentId, double Average)> GetTopStudents(int count)
{
// TODO: 使用简单循环获取平均分最高的学生
// 提示：可以先计算所有学生的平均分，然后排序取前count个

var averages = new List<(string StudentId, double Average)>();
foreach (var kvp in scores)
{
double avg = CalculateAverage(kvp.Key);
averages.Add((kvp.Key, avg));
}
averages.Sort((a, b) => b.Average.CompareTo(a.Average));
return averages.GetRange(0, Math.Min(count, averages.Count));
}

public Dictionary<string, List<Score>> GetAllScores()
Expand All @@ -177,7 +252,14 @@ public void SaveStudentsToFile(List<Student> students, string filePath)
try
{
// 在这里实现文件写入逻辑

using (var writer = new StreamWriter(filePath))
{
writer.WriteLine("StudentId,Name,Age");
foreach (var student in students)
{
writer.WriteLine($"{student.StudentId},{student.Name},{student.Age}");
}
}
}
catch (Exception ex)
{
Expand All @@ -194,7 +276,25 @@ public List<Student> LoadStudentsFromFile(string filePath)
try
{
// 在这里实现文件读取逻辑

using (var reader = new StreamReader(filePath))
{
string? line;
bool isFirstLine = true;
while ((line = reader.ReadLine()) != null)
{
if (isFirstLine) { isFirstLine = false; continue; }
var parts = line.Split(',');
if (parts.Length == 3)
{
string id = parts[0];
string name = parts[1];
if (int.TryParse(parts[2], out int age))
{
students.Add(new Student(id, name, age));
}
}
}
}
}
catch (Exception ex)
{
Expand Down Expand Up @@ -241,22 +341,52 @@ static void Main(string[] args)
// 3. 测试年龄范围查询
Console.WriteLine("\n3. 查找年龄在19-20岁的学生:");
// TODO: 调用GetStudentsByAge方法并显示结果

var studentsInRange = studentManager.GetStudentsByAge(19, 20);
foreach (var stu in studentsInRange)
{
Console.WriteLine(stu);
}

// 4. 显示学生成绩统计
Console.WriteLine("\n4. 学生成绩统计:");
// TODO: 遍历所有学生，显示其成绩、平均分和等级

foreach (var stu in studentManager.GetAll())
{
Console.WriteLine($"学生: {stu}");
var scores = scoreManager.GetStudentScores(stu.StudentId);
foreach (var score in scores)
{
Console.WriteLine($" {score}");
}
double avg = scoreManager.CalculateAverage(stu.StudentId);
var grade = scoreManager.GetGrade(avg);
Console.WriteLine($" 平均分: {avg:F2}, 等级: {grade}");
}

// 5. 显示排名（简化版）
Console.WriteLine("\n5. 平均分最高的学生:");
// TODO: 调用GetTopStudents(1)方法显示第一名

var top = scoreManager.GetTopStudents(1);
if (top.Count > 0)
{
var stuId = top[0].StudentId;
var avg = top[0].Average;
var grade = scoreManager.GetGrade(avg);
Console.WriteLine($"学号: {stuId}, 平均分: {avg:F2}, 等级: {grade}");
}

// 6. 文件操作
Console.WriteLine("\n6. 数据持久化演示:");
// TODO: 保存和读取学生文件

string filePath = "students.csv";
dataManager.SaveStudentsToFile(studentManager.GetAll(), filePath);
Console.WriteLine($"学生数据已保存到 {filePath}");
var loadedStudents = dataManager.LoadStudentsFromFile(filePath);
Console.WriteLine("读取到的学生数据:");
foreach (var stu in loadedStudents)
{
Console.WriteLine(stu);
}

}
catch (Exception ex)
Expand Down
23 changes: 23 additions & 0 deletions Homework/bin/Debug/net9.0/Homework.deps.json
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{
"runtimeTarget": {
"name": ".NETCoreApp,Version=v9.0",
"signature": ""
},
"compilationOptions": {},
"targets": {
".NETCoreApp,Version=v9.0": {
"Homework/1.0.0": {
"runtime": {
"Homework.dll": {}
}
}
}
},
"libraries": {
"Homework/1.0.0": {
"type": "project",
"serviceable": false,
"sha512": ""
}
}
}
Binary file added Homework/bin/Debug/net9.0/Homework.dll
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Binary file added Homework/bin/Debug/net9.0/Homework.exe
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Binary file added Homework/bin/Debug/net9.0/Homework.pdb
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