// @nuget: EntityFramework

// @nuget: Z.EntityFramework.Extensions

​

using System;

using System.Linq;

using System.Data.Entity;

​

public class Program

{

    public static void Main()

    {   

        // ADD seed data here

        using (var context = new EntityContext())

        {

            context.BusinessCustomers.Add(new BusinessCustomer() { Name ="Customer_A", IsActive = false  });

            context.BusinessCustomers.Add(new BusinessCustomer() { Name ="Customer_B", IsActive = true });

            context.BusinessCustomers.Add(new BusinessCustomer() { Name ="Customer_C", IsActive = false });

            context.SaveChanges();

            FiddleHelper.WriteTable("1 - Before", context.Customers);

        }

        // ADD code to reproduce the issue here

        using (var context = new EntityContext())

        {

            // issue

            var customers = context.Customers.WhereBulkContains(new []{1});

            customers.First().Name = "FirstCustomer";

        }

        using(var context = new EntityContext())

        {

            FiddleHelper.WriteTable("2 - After", context.Customers);

        }

    }

    public class EntityContext : DbContext

    {

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

        {

​

        }

        public DbSet<Customer> Customers { get; set; }

        public DbSet<BusinessCustomer> BusinessCustomers { get; set; }

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public Boolean IsActive { get; set; }

    }

    public class BusinessCustomer : Customer

    {

    }

}