// Entity Framework Extensions

// Doc: https://entityframework-extensions.net/ignore-on-synchronize-insert-expression

​

// @nuget: EntityFramework

// @nuget: Z.EntityFramework.Extensions

​

using System;

using System.Linq;

using System.Data.Entity;

​

public class Program

{

    public static void Main()

    {

        GenerateData();

        // IgnoreOnSynchronizeInsertExpression: Gets or sets columns to ignore when the `BulkSynchronize` method executes the `insert` statement.

        using (var context = new EntityContext())

        {

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

            customers.ForEach(x => { x.Name += "_Updated"; x.Description += "_Updated"; x.ModifiedDate = DateTime.Now; x.IsActive = false; });

            customers.Add(new Customer() { Name = "Alexander", Description = "Description of Alexander", CreatedDate = DateTime.Now, ModifiedDate = DateTime.Now, IsActive = true });

            context.BulkSynchronize(customers, options => 

            {

                options.IgnoreOnSynchronizeInsertExpression = customer => new {customer.CustomerID,  customer.ModifiedDate};

            });

        }

        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 = "Carson", Description = "Description of Carson", CreatedDate = DateTime.Now.AddDays(-3), ModifiedDate = DateTime.Now.AddDays(-3), IsActive = true });

            context.Customers.Add(new Customer() { Name = "Meredith", Description = "Description of Meredith", CreatedDate = DateTime.Now.AddDays(-2), ModifiedDate = DateTime.Now.AddDays(-2), IsActive = true });

            context.Customers.Add(new Customer() { Name = "Arturo", Description = "Description of Arturo", CreatedDate = DateTime.Now.AddDays(-1), ModifiedDate = DateTime.Now.AddDays(-1), IsActive = true });

            context.BulkSaveChanges();

            FiddleHelper.WriteTable("Before BulkSynchronize",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 DateTime? ModifiedDate { get; set; }

        public DateTime CreatedDate { get; set; }

        public Boolean IsActive { get; set; }

    }

}