// Entity Framework Classic

// Doc: https://entityframework-classic.net/bulk-save-changes

​

// @nuget: Z.EntityFramework.Classic

​

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Data.Entity;

using System.Linq;

using System.Data.Entity.Migrations;

​

public class Program

{

    public static List<BenchmarkResult> BenchmarkResults = new List<BenchmarkResult>();

    public static void Main()

    {

        JustInTime_Compile();

        var customerCount = 500;

​

        var clockSaveChanges = new Stopwatch();

        var clockBulkSaveChanges = new Stopwatch();

        var clockBulkSaveChangesFalse = new Stopwatch();

        using (var context = new EntityContext())

        {

            // Clean

            context.BulkDelete(context.Customers);

            GenerateCustomers(customerCount);

            // UPDATE existing customers

            context.Customers.ToList().ForEach(x => x.FirstName += "_z");

            // ADD new customers

            var toAdd = new List<Customer>();

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

            {

                toAdd.Add(new Customer() { Code = "Insert_Code_" + i, FirstName = "Insert_FirstName_" + i, LastName = "Insert_LastName_" + i });

            }

            context.Customers.AddRange(toAdd);

            // SaveChanges

            clockSaveChanges.Start();

            context.SaveChanges();

            clockSaveChanges.Stop();

​

            BenchmarkResults.Add(new BenchmarkResult() { Action = "SaveChanges (EF)", Entities = context.Customers.Count(), Performance = clockSaveChanges.ElapsedMilliseconds + " ms" });

        }

        using (var context = new EntityContext())

        {

            // Clean

            context.BulkDelete(context.Customers);

            GenerateCustomers(customerCount);

            // UPDATE existing customers

            context.Customers.ToList().ForEach(x => x.FirstName += "_z");

            // ADD new customers

            var toAdd = new List<Customer>();

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

            {

                toAdd.Add(new Customer() { Code = "Insert_Code_" + i, FirstName = "Insert_FirstName_" + i, LastName = "Insert_LastName_" + i });

            }

            context.Customers.AddRange(toAdd);

​

            // BulkSaveChanges

            clockBulkSaveChanges.Start();

            context.BulkSaveChanges();

            clockBulkSaveChanges.Stop();

​

            BenchmarkResults.Add(new BenchmarkResult() { Action = "BulkSaveChanges (EF Classic)", Entities = context.Customers.Count(), Performance = clockBulkSaveChanges.ElapsedMilliseconds + " ms" });

            // Clean

            context.BulkDelete(context.Customers);

        }

        using (var context = new EntityContext())

        {

            // Clean

            context.BulkDelete(context.Customers);

            GenerateCustomers(customerCount);

            // UPDATE existing customers

            context.Customers.ToList().ForEach(x => x.FirstName += "_z");

            // ADD new customers

            var toAdd = new List<Customer>();

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

            {

                toAdd.Add(new Customer() { Code = "Insert_Code_" + i, FirstName = "Insert_FirstName_" + i, LastName = "Insert_LastName_" + i });

            }

            context.Customers.AddRange(toAdd);

​

            // BulkSaveChanges

            clockBulkSaveChangesFalse.Start();

            context.BulkSaveChanges(false);

            clockBulkSaveChangesFalse.Stop();

​

            BenchmarkResults.Add(new BenchmarkResult() { Action = "BulkSaveChanges(false) (EF Classic)", Entities = context.Customers.Count(), Performance = clockBulkSaveChangesFalse.ElapsedMilliseconds + " ms" });

            // Clean

            context.BulkDelete(context.Customers);

        }

        FiddleHelper.WriteTable(BenchmarkResults);

    }

    public static void JustInTime_Compile()

    {

        // SaveChanges

        using (var context = new EntityContext())

        {

            GenerateCustomers(20);          

            context.Customers.ToList().ForEach(x => x.FirstName += "_z");

            context.SaveChanges();

        }

​

        // BulkSaveChanges

        using (var context = new EntityContext())

        {

            GenerateCustomers(20);          

            context.Customers.ToList().ForEach(x => x.FirstName += "_z");

            context.BulkSaveChanges();

        }

        // BulkSaveChanges(false)

        using (var context = new EntityContext())

        {

            GenerateCustomers(20);          

            context.Customers.ToList().ForEach(x => x.FirstName += "_z");

            context.BulkSaveChanges(false);

        }

        // Clean

        using (var context = new EntityContext())

        {

            context.BulkDelete(context.Customers);

        }

    }

    public static List<Customer> GenerateCustomers(int count)

    {

        var list = new List<Customer>();

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

        {

            list.Add(new Customer() { Code = "Update_Code_" + i, FirstName = "Update_FirstName_" + i, LastName = "Update_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; }

    }

    public class BenchmarkResult

    {

        public string Action { get; set; }

        public int Entities { get; set; }

        public string Performance { get; set; }

    }

}