// Entity Framework Extensions

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

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

// @nuget: Z.EntityFramework.Extensions.EFCore

​

using System;

using Microsoft.EntityFrameworkCore;

using System.Collections.Generic;

using Microsoft.Data.SqlClient;

using System.Diagnostics;

using System.Linq;

public class Program

{

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

    public static void Main()

    {       

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

​

        JustInTime_Compile();

        // Generate X customers

        GenerateCustomers(2500);

        var clockSaveChanges = new Stopwatch();

        var clockBulkUpdate = new Stopwatch();

        using (var context = new EntityContext())

        {

            // SaveChanges

            var customers = context.Customers.ToList();         

            customers.ForEach(x => {

                x.FirstName += "_z";

                x.Column1 += "_z";

                x.Column2 += "_z";

                x.Column3 += "_z";

                x.Column4 += "_z";

                x.Column5 += "_z";

                x.Column6 += "_z";

                x.Column7 += "_z";

                x.Column8 += "_z";

                x.Column9 += "_z";

            });

​

            clockSaveChanges.Start();

            context.SaveChanges();

            clockSaveChanges.Stop();

​

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

        }

        using (var context = new EntityContext())

        {

            // BulkUpdate

            var customers = context.Customers.ToList();         

            customers.ForEach(x => {

                x.FirstName += "_z";

                x.Column1 += "_z";

                x.Column2 += "_z";

                x.Column3 += "_z";

                x.Column4 += "_z";

                x.Column5 += "_z";

                x.Column6 += "_z";

                x.Column7 += "_z";

                x.Column8 += "_z";

                x.Column9 += "_z";

            });

​

            clockBulkUpdate.Start();

            context.BulkUpdate(customers);

            clockBulkUpdate.Stop();

​

            BenchmarkResults.Add(new BenchmarkResult() { Action = "BulkUpdate (EF Extensions)", Entities = customers.Count, Performance = clockBulkUpdate.ElapsedMilliseconds + " ms" });

        }

        FiddleHelper.WriteTable(BenchmarkResults);

    }

    public static void JustInTime_Compile()

    {

        // SaveChanges

        using (var context = new EntityContext())

        {

            var customers = context.Customers.ToList();         

            customers.ForEach(x => {

                x.FirstName += "_z";

                x.Column1 += "_z";

                x.Column2 += "_z";

                x.Column3 += "_z";

                x.Column4 += "_z";

                x.Column5 += "_z";

                x.Column6 += "_z";

                x.Column7 += "_z";

                x.Column8 += "_z";

                x.Column9 += "_z";

            });

            context.SaveChanges();

        }

​

        // BulkUpdate

        using (var context = new EntityContext())

        {

            var customers = context.Customers.ToList();         

            customers.ForEach(x => {

                x.FirstName += "_z";

                x.Column1 += "_z";

                x.Column2 += "_z";

                x.Column3 += "_z";

                x.Column4 += "_z";

                x.Column5 += "_z";

                x.Column6 += "_z";

                x.Column7 += "_z";

                x.Column8 += "_z";

                x.Column9 += "_z";

            });

            context.BulkUpdate(customers);

        }

        // 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 = "Code_" + i, FirstName = "FirstName_" + i, LastName = "LastName_" + i });

        }

​

        using (var context = new EntityContext())

        {

            context.BulkInsert(list, options => options.AutoMapOutputDirection = false);

        }

        return list;

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

            optionsBuilder.UseSqlServer(new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()));

​

            base.OnConfiguring(optionsBuilder);

        }

        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 string Column1 { get; set; }

        public string Column2 { get; set; }

        public string Column3 { get; set; }

        public string Column4 { get; set; }

        public string Column5 { get; set; }

        public string Column6 { get; set; }

        public string Column7 { get; set; }

        public string Column8 { get; set; }

        public string Column9 { get; set; }

    }

    public class BenchmarkResult

    {

        public string Action { get; set; }

        public int Entities { get; set; }

        public string Performance { get; set; }

    }

}