// @nuget: EntityFramework

// @nuget: EntityFramework.SqlServerCompact

// @nuget: Microsoft.SqlServer.Compact

// @nuget: Z.EntityFramework.Extensions

​

using System.Data.Entity;

using System.Collections.Generic;

using System.Linq;

using Z.EntityFramework.Extensions;

public class Program

{

    public static void Main()

    {

        // Custom configuration specific for .NET Fiddle

        Z.EntityFramework.Extensions.EntityFrameworkManager.UseFiddleSqlCompact(System.Data.Entity.SqlServerCompact.SqlCeProviderServices.Instance, System.Data.SqlServerCe.SqlCeProviderFactory.Instance);

​

        List<Invoice> list =  new List<Invoice>() {

        new Invoice() { Description = "Invoice_A", InvoiceItems = new List<InvoiceItem>() { new InvoiceItem() { Description = "Invoice_A_InvoiceItem_A" } , new InvoiceItem() { Description = "Invoice_A_InvoiceItem_B" }}}, 

        new Invoice() { Description = "Invoice_B", InvoiceItems = new List<InvoiceItem>() { new InvoiceItem() { Description = "Invoice_B_InvoiceItem_A" } , new InvoiceItem() { Description = "Invoice_B_InvoiceItem_B" }}}};

        // ContextFactory: The context factory is a function `Func<DbContext, DbContext>` that provide the current DbContext as a parameter and requires to return a new DbContext. 

        EntityFrameworkManager.ContextFactory = context =>

        {

            if (context is EntityContext)

            {

                return new EntityContext();

            }

            else

            {

                return new ElseContext();

            }

        };

        using (var context = new EntityContext())

        {

            context.BulkInsert(list, options => options.IncludeGraph = true);

        }

        using (var context = new ElseContext())

        {

            context.BulkInsert(list, options => options.IncludeGraph = true);

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("EntityContext : Invoices" ,context.Invoices.Include(x => x.InvoiceItems).ToList());

            FiddleHelper.WriteTable("EntityContext : InvoiceItems",context.InvoiceItems.ToList());

        }

        using (var context = new ElseContext())

        {

            FiddleHelper.WriteTable("ElseContext : Invoices" ,context.Invoices.Include(x => x.InvoiceItems).ToList());

            FiddleHelper.WriteTable("ElseContext : InvoiceItems" ,context.InvoiceItems.ToList());

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() : base(@"Data Source=ZZZ_Projects.sdf")

        {

​

        }

        public DbSet<Invoice> Invoices { get; set; }

        public DbSet<InvoiceItem> InvoiceItems { get; set; }

    }

​

    public class ElseContext : DbContext

    {

        public static string connection = @"Data Source=ElseContext.sdf";

        public ElseContext() : base(connection)

        {

        }

        public DbSet<Invoice> Invoices { get; set; }

        public DbSet<InvoiceItem> InvoiceItems { get; set; }

    }

    public class Invoice

    {

        public int InvoiceID { get; set; }

        public string Description { get; set; }

        public List<InvoiceItem> InvoiceItems { get; set; }

    }

    public class InvoiceItem

    {

        public int InvoiceItemID { get; set; }

        public string Description { get; set; }

    }

}