从HashSet获取值 <T> 使用反射

Question

I need a way to get the values from a generic HashSet using reflection . Here is what I've tried (you can copy/paste this on a console app):

 class Program
    {
        public class Order
        {
            public int Id { get; set; }
        }

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

            public ICollection<Order> Orders { get; set; }

        }

        static void Main(string[] args)
        {
            var person = new Person();
            person.Name = "Test Person";

            person.Orders = new HashSet<Order>();

            person.Orders.Add(new Order() { Id = 1 });
            person.Orders.Add(new Order() { Id = 2 });

            var reflectedOrders = person.GetType().GetProperty("Orders").GetValue(person, null);

            Console.WriteLine("How do I iterate the reflected orders?");

            Console.ReadLine();
        }
    }

---

EDIT

It's an example, in the real application I don't know which type to convert the reflected Orders. I only know the property is an ICollection<T> (turned to HashShet by EF)

Answer 1

您是否尝试过将reflectedOrders强制转换为IEnumerable ？

IEnumerable reflectedOrders = (IEnumerable)person.GetType().GetProperty("Orders").GetValue(person, null);

Answer 2

It should be simple as casting:

var reflectedOrders = (HashSet<Order>) person.GetType().GetProperty("Orders").GetValue(person, null);

foreach (var order in reflectedOrders)
    ...

Answer 3

关于什么

var orders = persons.OfType<Person>().SelectMany(p => p.Orders);