是否可以在Observable Collection中数组列的索引上添加分组？

// 创建Observable Collection
ObservableCollection<Person> people = new ObservableCollection<Person>();

// 添加元素到Observable Collection
people.Add(new Person("John", "Doe", 25));
people.Add(new Person("Jane", "Smith", 30));
people.Add(new Person("Tom", "Johnson", 35));
people.Add(new Person("Alice", "Williams", 40));

// 创建CollectionViewSource并设置分组属性
CollectionViewSource cvs = new CollectionViewSource();
cvs.Source = people;
cvs.GroupDescriptions.Add(new PropertyGroupDescription("LastName"));

// 获取分组后的数据
ListCollectionView lcv = cvs.View as ListCollectionView;
var groups = lcv.Groups;

// 遍历分组并输出结果
foreach (CollectionViewGroup group in groups)
{
    Console.WriteLine("Group: " + group.Name);
    foreach (Person person in group.Items)
    {
        Console.WriteLine("  " + person.FirstName + " " + person.LastName);
    }
}

// 定义Person类
public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }

    public Person(string firstName, string lastName, int age)
    {
        FirstName = firstName;
        LastName = lastName;
        Age = age;
    }
}