// Entity Framework Extensions

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

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

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

​

using Microsoft.EntityFrameworkCore;

using System.Collections.Generic;

using Microsoft.Data.SqlClient;

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        // SEED

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Name = "A" });

            context.BulkSaveChanges();

        }   

        // TEST

        using (var context = new EntityContext())

        {

            var customers = new List<Customer>();

            customers.Add(new Customer() { CustomerID = 1, Name = "A_Updated" });

            customers.Add(new Customer() { Name = "B" });

            customers.Add(new Customer() { Name = "C" });

            context.BulkMerge(customers);

            FiddleHelper.WriteTable("1 - Customers", customers);

        }

    }

    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; }

    }

}