// Entity Framework Extensions

// Doc: https://entityframework-extensions.net/pre-bulk-merge

​

// @nuget: EntityFramework

// @nuget: Z.EntityFramework.Extensions

​

using System;

using System.Linq;

using System.Data.Entity;

using System.Collections.Generic;

using Z.EntityFramework.Extensions;

​

public class Program

{

    public static void Main()

    {

        GenerateData();

        EntityFrameworkManager.PreBulkMerge = (ctx, obj) => 

        {

            if(obj is IEnumerable<Customer>) 

            {

                foreach(var customer in (IEnumerable<Customer>)obj)

                {

                    if (customer.CustomerID == 0)

                    {

                        customer.CreatedDate = DateTime.Now;

                    }

                    else

                    {

                        customer.ModifiedDate = DateTime.Now;

                    }

                }

            }

        };

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("Before_BulkMerge", context.Customers.ToList());

            var list = context.Customers.ToList();

            list.ForEach(x => { x.Name += "_Updated"; x.IsActive = false; });

            list.Add(new Customer() { Name ="Customer_C", IsActive = true});

            list.Add(new Customer() { Name ="Customer_D", IsActive = true});

            context.BulkMerge(list);

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("After_BulkMerge", context.Customers.ToList());

        }

    }

    public static void GenerateData()

    {   

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Name ="Customer_A", IsActive = true });

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

​

            context.BulkSaveChanges();  

        }

    }

​

    public class EntityContext : DbContext

    {

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

        {

​

        }

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

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

        public Boolean IsActive { get; set; }

        public DateTime? CreatedDate { get; set; }

        public DateTime? ModifiedDate { get; set; }

    }

}