// @nuget: Z.EntityFramework.Classic

using System;

using System.Collections.Generic;

using System.Linq;

using System.Data.Entity;

​

public class Program

{

    public static void Main()

    {

        GenerateData();

​

        // BulkMerge: MERGE all entities from the database.

        using (var context = new EntityContext())

        {

            var list = context.Customers.ToList();

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

            list.First().Description = "Updated_A";

            context.BulkMerge(list);

            FiddleHelper.WriteTable(context.Customers.ToList());    

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

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

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

​

            context.BulkSaveChanges();  

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable(context.Customers.ToList());    

        }

    }

​

    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; }

    }

}