如何在Linq中分组？

var 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 = "C" },
    new Student { Name = "Eve", Age = 18, Grade = "B" }
};

var groupedStudents = students.GroupBy(s => s.Grade);

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();
}