// Entity Framework Extensions

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

​

// @nuget: Z.EntityFramework.Extensions

// @nuget: EntityFramework

​

using System.Data.Entity;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var customers = GenerateCustomers(5);

        using (var context = new EntityContext())

        {

            context.BulkInsert(customers, options => options.ColumnInputExpression = c => new { c.CustomerID, c.Name} );

            context.BulkInsert(customers, options => options.IgnoreOnInsertExpression = c => new { c.ColumnToIgnore } );

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

        }   

    }

    public static List<Customer> GenerateCustomers(int count) 

    {

        List<Customer>  list = new List<Customer>();

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

        {

            list.Add(new Customer() { Name = "Customer_" + i, ColumnToIgnore = "Ignore_" + i });

        }

        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 Name { get; set; }

        public string ColumnToIgnore { get; set; }

    }

}