从Group by LINQ语句C#返回多个值

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
    public static void Main()
    {
        // 创建一个包含学生信息的列表
        List<Student> students = new List<Student>()
        {
            new Student { Name = "Alice", Age = 20, Grade = "A" },
            new Student { Name = "Bob", Age = 21, Grade = "B" },
            new Student { Name = "Charlie", Age = 20, Grade = "A" },
            new Student { Name = "David", Age = 22, Grade = "C" },
            new Student { Name = "Eve", Age = 21, Grade = "B" }
        };

        // 使用Group by语句按年龄分组学生
        var groupedStudents = students.GroupBy(s => s.Age);

        // 遍历每个分组并输出结果
        foreach (var group in groupedStudents)
        {
            Console.WriteLine("年龄: " + group.Key);

            // 输出每个分组的学生信息
            foreach (var student in group)
            {
                Console.WriteLine("姓名: " + student.Name + ", 成绩: " + student.Grade);
            }

            Console.WriteLine();
        }
    }
}

public class Student
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string Grade { get; set; }
}