// Entity Framework Extensions

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

​

// @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.Threading;

using System.Threading.Tasks;

public class Program

{

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

    public static void Main()

    {

        MainAsync().Wait();

    }

    public static async Task MainAsync()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        JustInTime_Compile();

        //await JustInTime_Compile();

        // Generate X entities

        var customers = GenerateCustomers(1000);

        var clockSaveChanges = new Stopwatch();

        var clockBulkSaveChanges = new Stopwatch();

        using (var context = new EntityContext())

        {

            // SaveChangesAsync

            context.Customers.AddRange(customers);

            clockSaveChanges.Start();

            context.SaveChanges();

            //await context.SaveChangesAsync();

            clockSaveChanges.Stop();

​

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

        }

        using (var context = new EntityContext())

        {

            // BulkSaveChangesAsync

            context.Customers.AddRange(customers);

            clockBulkSaveChanges.Start();

            await context.BulkSaveChangesAsync();

            clockBulkSaveChanges.Stop();

​

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

        }

        FiddleHelper.WriteTable("EFE - High-performance bulk operations", BenchmarkResults);

    }

    public static async Task JustInTime_Compile()

    {

        var customers = GenerateCustomers(20);

        // SaveChangesAsync

        using (var context = new EntityContext())

        {

            context.Customers.AddRange(customers);

            await context.SaveChangesAsync();

            context.Customers.RemoveRange(customers);

            await context.SaveChangesAsync();

        }

        // BulkSaveChangesAsync

        using (var context = new EntityContext())

        {

            context.Customers.AddRange(customers);

            await context.BulkSaveChangesAsync();

            context.Customers.RemoveRange(customers);

            await context.BulkSaveChangesAsync();

        }

    }

    public static List<Customer> GenerateCustomers(int count)

    {

        var list = new List<Customer>();

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

        {

            list.Add(new Customer() { Name = "Customer_" + i, Description = "Description_" +  i, IsActive = i % 2 == 0 });

        }

​

        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 Name { get; set; }

        public string Description { get; set; }

        public Boolean IsActive { get; set; }

    }

    public class BenchmarkResult

    {

        public string Action { get; set; }

        public int Entities { get; set; }

        public string Performance { get; set; }

    }

}