使用LINQ GroupBy映射多个对象属性

class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

List<Person> people = new List<Person>
{
    new Person { Name = "Alice", Age = 25 },
    new Person { Name = "Bob", Age = 30 },
    new Person { Name = "Alice", Age = 35 },
    new Person { Name = "Bob", Age = 40 }
};

var groupedPeople = people.GroupBy(p => new { p.Name, p.Age });

foreach (var group in groupedPeople)
{
    Console.WriteLine($"Group: {group.Key.Name}, {group.Key.Age}");
    foreach (var person in group)
    {
        Console.WriteLine($"Person: {person.Name}, {person.Age}");
    }
    Console.WriteLine();
}

Group: Alice, 25
Person: Alice, 25

Group: Bob, 30
Person: Bob, 30

Group: Alice, 35
Person: Alice, 35

Group: Bob, 40
Person: Bob, 40