// Entity Framework Classic

// Doc: https://entityframework-classic.net/bulk-update

​

// @nuget: Z.EntityFramework.Classic

​

​

using System;

using System.Collections.Generic;

using System.Linq;

using System.Data.Entity;

public class Program

{

    public static void Main()

    {

        var customers = GenerateCustomers(5);

        using(var context = new EntityContext())

        {

            // Easy to customize

            customers.ForEach(x => x.LastName += "_Updated");

            context.BulkUpdate(customers, options => options.ColumnPrimaryKeyExpression = customer => customer.Code);

            FiddleHelper.WriteTable("2 - LastName Updated (using custom key)", context.Customers.ToList()); 

        }

    }

    public static List<Customer> GenerateCustomers(int count)

    {

        var list = new List<Customer>();

        for(int i = 0; i < count; i++)

        {

            list.Add(new Customer() { Code = "Code_" + i, FirstName = "FirstName_" + i, LastName = "LastName_" + i });

        }

        using (var context = new EntityContext())

        {

            context.BulkInsert(list);

        }

        return list;

    }

​

    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 Code { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

    }

}