// 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;

using Z.BulkOperations;

public class Program

{

    public static void Main()

    {

        var customers = GenerateCustomers(3);

        using (var context = new EntityContext())

        {

            context.BulkInsert(customers);

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

        }       

        customers = GenerateCustomers(5);

        using (var context = new EntityContext())

        {

            List<AuditEntry> auditEntries = new List<AuditEntry>();

            // Customer "C_0", "C_1", "C_2" already exists

            // Customer "C_3", "C_4" are added

            context.BulkInsert(customers, options => {

                options.InsertIfNotExists = true;

                options.ColumnPrimaryKeyExpression = c => c.Code;

                options.UseAudit = true;

                options.AuditEntries = auditEntries;

            });

            FiddleHelper.WriteTable("2 - Customers After", context.Customers);

            // Retrieve value that has been inserted

            foreach (var entry in auditEntries)

            {

                FiddleHelper.WriteTable("Value Inserted", entry.Values);

            }

        }   

    }

    public static List<Customer> GenerateCustomers(int count) 

    {

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

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

        {

            list.Add(new Customer() { CustomerID = 100 + i, Code = "C_" + i, Name = "Customer_" + 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 Code { get; set; }

        public string Name { get; set; }

    }

}