// Entity Framework Extensions

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

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

// @nuget: Z.EntityFramework.Extensions.EFCore

​

using System;

using System.Linq;

using Microsoft.EntityFrameworkCore;

using System.Collections.Generic;

using Microsoft.Data.SqlClient;

using Z.EntityFramework.Extensions;

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        GenerateData();

        EntityFrameworkManager.PreBulkSynchronize = (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_BulkSynchronize", context.Customers.ToList());

            var list = context.Customers.Take(2).ToList();

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

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

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

            context.BulkSynchronize(list);

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("After_BulkSynchronize", 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.Customers.Add(new Customer() { Name ="Customer_C", IsActive = true });

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

​

            context.BulkSaveChanges();  

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

            optionsBuilder.UseSqlServer(new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()));

​

            base.OnConfiguring(optionsBuilder);

        }

        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; }

    }

}