详细代码实现c# 将list中（姓名，班级，小组，小组优先级，年龄，成绩）进行一级分类班级，二级分类小组进行分组并按照小组的优先级排序，代码实现高效找出分组后的成绩匹配的值

以下是 C# 代码实现：

// 定义学生类
public class Student
{
    public string Name { get; set; }
    public string Class { get; set; }
    public string Group { get; set; }
    public int GroupPriority { get; set; }
    public int Age { get; set; }
    public double Score { get; set; }
}

// 定义分组类
public class Group
{
    public string Class { get; set; }
    public string Name { get; set; }
    public int Priority { get; set; }
    public List<Student> Students { get; set; }
}

// 将学生列表按照班级、小组、小组优先级进行分组
public List<Group> GroupStudents(List<Student> students)
{
    var groups = new List<Group>();
    var classGroups = students.GroupBy(s => s.Class);
    foreach (var classGroup in classGroups)
    {
        var groupGroups = classGroup.GroupBy(s => s.Group);
        foreach (var groupGroup in groupGroups)
        {
            var group = new Group
            {
                Class = classGroup.Key,
                Name = groupGroup.Key,
                Priority = groupGroup.First().GroupPriority,
                Students = groupGroup.ToList()
            };
            groups.Add(group);
        }
    }
    return groups.OrderBy(g => g.Priority).ToList();
}

// 在分组后的列表中查找成绩匹配的值
public double FindMatchingScore(List<Group> groups, double targetScore)
{
    foreach (var group in groups)
    {
        var matchingStudent = group.Students.FirstOrDefault(s => s.Score == targetScore);
        if (matchingStudent != null)
        {
            return matchingStudent.Score;
        }
    }
    return -1; // 如果没有找到匹配的值，返回 -1
}

使用示例：

var students = new List<Student>
{
    new Student { Name = "张三", Class = "1班", Group = "A组", GroupPriority = 1, Age = 18, Score = 80 },
    new Student { Name = "李四", Class = "1班", Group = "A组", GroupPriority = 1, Age = 19, Score = 85 },
    new Student { Name = "王五", Class = "1班", Group = "B组", GroupPriority = 2, Age = 20, Score = 90 },
    new Student { Name = "赵六", Class = "2班", Group = "C组", GroupPriority = 3, Age = 21, Score = 95 }
};

var groups = GroupStudents(students);
var matchingScore = FindMatchingScore(groups, 90);
Console.WriteLine(matchingScore); // 输出 90