Sorting a list based on a condition placed on property of its inner list

Question

I have a List<Order> and each Order has an inner list List<Item> , each Item has a property IsLateForDelivery . I want to sort the list of orders so that an Order with most number of Items that are Late for delivery is at index 0 .

Answer 1

Using System.Linq;
//List<Order> Orders
Orders.OrderByDescending(order => order.Items.Count(item => item.IsLateForDelivery))

Answer 2

This is how to do it:

class Program
{
    static void Main(string[] args)
    {
        List<Order> orders = new List<Order>();
        //List seed
        orders = orders.OrderByDescending(x => x.Items.Count(y => y.IsLateForDelivery)).ToList();
    }
}

public class Order
{
    public List<Item> Items { get; set; }
}

public class Item
{
    public bool IsLateForDelivery { get; set; }
}