// Entity Framework Classic

// Doc: https://entityframework-classic.net/bulk-merge

​

// @nuget: Z.EntityFramework.Classic

​

using System;

using System.Collections.Generic;

using System.Linq;

using System.Data.Entity;

public class Program

{

    public static void Main()

    {

        GenerateInvoices(2,2);

​

        using(var context = new EntityContext())

        {

            var invoices = context.Invoices.Include(x => x.InvoiceItems).ToList();

            invoices.ForEach(x => x.Description += "_Updated");

            invoices.SelectMany(x => x.InvoiceItems).ToList().ForEach(x => x.Description += "_Updated");

            invoices.Add(new Invoice() { Description = "New_Description", InvoiceItems = new List<InvoiceItem>()

            {

                new InvoiceItem() { Description = "New_Description" }

            }});

            FiddleHelper.WriteTable("1 - Before BulkUpdate (Invoice)", context.Invoices.AsNoTracking().ToList());   

            FiddleHelper.WriteTable("2 - Before BulkUpdate (InvoiceItem)", context.InvoiceItems.AsNoTracking().ToList());   

            context.BulkMerge(invoices, options => options.IncludeGraph = true);

            FiddleHelper.WriteTable("3 - After BulkUpdate (Invoice)", context.Invoices.AsNoTracking().ToList());    

            FiddleHelper.WriteTable("4 - After BulkUpdate (InvoiceItem)", context.InvoiceItems.AsNoTracking().ToList());    

        }

    }

    public static List<Invoice> GenerateInvoices(int invoiceCount, int invoiceItemCount)

    {

        var list = new List<Invoice>();

        for(int i = 0; i < invoiceCount; i++)

        {

            var invoice = new Invoice() { Description = "Invoice_" + i, InvoiceItems = new List<InvoiceItem>() };

            list.Add(invoice);

            for(int j = 0; j < invoiceItemCount; j++)

            {

                invoice.InvoiceItems.Add(new InvoiceItem() { Description = "InvoiceItem_" + i + "_" + j });

            }

        }

        using (var context = new EntityContext())

        {

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

        }

​

        return list;

    }

​

    public class EntityContext : DbContext

    {

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

        {

        }

        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; }

    }

}