using System.Data.Entity;
using System.Collections.Generic;
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())
context.BulkInsert(customers, options => {
options.InsertIfNotExists = true;
options.ColumnPrimaryKeyExpression = c => c.Code;
FiddleHelper.WriteTable("2 - Customers After", 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() { CustomerID = 100 + i, Code = "C_" + i, Name = "Customer_" + i});
public class EntityContext : DbContext
public EntityContext() : base(FiddleHelper.GetConnectionStringSqlServer())
public DbSet<Customer> Customers { get; set; }
public int CustomerID { get; set; }
public string Code { get; set; }
public string Name { get; set; }