// Entity Framework Extensions

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

​

// @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.BulkOperations;

​

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        GenerateData();

        // IgnoreOnUpdateExpression: Gets or sets columns to ignore when the `BulkUpdate` method executes the `update` statement.

        using (var context = new EntityContext())

        {           

            var customers = context.Customers.ToList();

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

            context.BulkUpdate(customers, options => 

            {

                options.IgnoreOnUpdateExpression = customer => new {customer.CustomerID,  customer.CreatedDate};

            });

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("After BulkUpdate",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 BulkUpdate",context.Customers.ToList());

        }

    }

​

    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 DateTime? ModifiedDate { get; set; }

        public DateTime CreatedDate { get; set; }

        public Boolean IsActive { get; set; }

    }

}