LINQ在group by之后选择具有最大值的行

// 假设有一个包含学生信息的集合
List<Student> students = GetStudents();

// 使用查询表达式语法
var result = from student in students
             group student by student.Class into g
             let maxScore = g.Max(s => s.Score)
             select g.FirstOrDefault(s => s.Score == maxScore);

// 使用方法语法
var result = students.GroupBy(s => s.Class)
                     .Select(g => g.OrderByDescending(s => s.Score).First());

// 输出结果
foreach (var student in result)
{
    Console.WriteLine($"Class: {student.Class}, Name: {student.Name}, Score: {student.Score}");
}