// Entity Framework Plus

// Doc: https://entityframework-plus.net/query-include-filter

​

// @nuget: EntityFramework

// @nuget: Z.EntityFramework.Plus.EF6

​

using System;

using System.Linq;

using System.Data.Entity;

using System.Collections.Generic;

using Z.EntityFramework.Plus;

​

public class Program

{

    public static void Main()

    {

        GenerateData();

​

        // Update: UPDATE all rows from the database using a LINQ Query without loading entities in the context.

        using (var context = new EntityContext())

        {

            // LOAD orders and the first 10 active related entities.

            var list = context.Orders.IncludeOptimized(x => x.OrderItems.Where(y => y.IsActive)).ToList();

            foreach(var order in list)

            {

                Console.WriteLine("Active order items in {0}: {1}", order.Name, order.OrderItems.Count());

            }

        }

    }

​

    public static void GenerateData()

    {

​

        using (var context = new EntityContext())

        {

            context.Orders.Add(new Order() { Name = "Order_A", Date = DateTime.Now.AddDays(-4), IsSoftDeleted = true });

            context.Orders.Add(new Order() { Name = "Order_B", Date = DateTime.Now.AddDays(-5), IsSoftDeleted = true });

​

            context.SaveChanges();

​

            context.OrderItems.Add(new OrderItem() { Date = DateTime.Now.AddDays(-4), IsActive = true, Price = 35, OrderId = 1 });

            context.OrderItems.Add(new OrderItem() { Date = DateTime.Now.AddDays(-4), IsActive = false, Price = 22, OrderId = 1 });

            context.OrderItems.Add(new OrderItem() { Date = DateTime.Now.AddDays(-5), IsActive = true, Price = 37, OrderId = 2 });

            context.OrderItems.Add(new OrderItem() { Date = DateTime.Now.AddDays(-5), IsActive = true, Price = 7, OrderId = 2 });

​

            context.SaveChanges();

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() : base(FiddleHelper.GetConnectionStringSqlServer())

        {

​

        }

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

        public DbSet<OrderItem> OrderItems { get; set; }

    }

​

    public class Order

    {

        public int OrderId { get; set; }

        public string Name { get; set; }

        public DateTime Date { get; set; }

        public bool IsSoftDeleted { get; set; }

        public List<OrderItem> OrderItems { get; set; }

    }

​

    public class OrderItem

    {

        public int OrderItemId { get; set; }

        public DateTime Date { get; set; }

        public bool IsActive { get; set; }

        public int Price { get; set; }

        public int OrderId { get; set; }

    }

}