尝试通过使用LINQ对子元素进行分组来创建列表

// 假设有一个包含学生信息的类
public class Student
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string Grade { get; set; }
}

// 创建学生列表
List<Student> students = new List<Student>
{
    new Student { Name = "Alice", Age = 18, Grade = "A" },
    new Student { Name = "Bob", Age = 19, Grade = "B" },
    new Student { Name = "Charlie", Age = 18, Grade = "A" },
    new Student { Name = "David", Age = 19, Grade = "B" },
    new Student { Name = "Eve", Age = 18, Grade = "A" }
};

// 使用LINQ对学生列表进行分组
var groupedStudents = from student in students
                      group student by student.Grade into studentGroup
                      select studentGroup;

// 遍历分组结果并输出
foreach (var group in groupedStudents)
{
    Console.WriteLine("Grade: " + group.Key);
    foreach (var student in group)
    {
        Console.WriteLine("Name: " + student.Name + ", Age: " + student.Age);
    }
    Console.WriteLine();
}