EntityFrameworkCore.Projectables/samples/ReadmeSample/Extensions/UserExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using EntityFrameworkCore.Projectables;
using ReadmeSample.Entities;

namespace ReadmeSample.Extensions
{
    public static class UserExtensions
    {
        [Projectable]
        public static Order GetMostRecentOrderForUser(this User user, bool includeUnfulfilled) => 
            user.Orders
                .Where(x => !includeUnfulfilled ? x .FulfilledDate != null : true)
                .OrderByDescending(x => x.CreatedDate)
                .FirstOrDefault();
    }
}