// 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;

​

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 entities

        var customers = GenerateCustomers(1000);

        var clockSaveChanges = new Stopwatch();

        var clockBulkSaveChanges = new Stopwatch();

        using (var context = new EntityContext())

        {

            // SaveChanges

            context.Customers.AddRange(customers);

            clockSaveChanges.Start();

            context.SaveChanges();

            clockSaveChanges.Stop();

            BenchmarkResults.Add(new BenchmarkResult()

            {Action = "SaveChanges (Entity Framework)", Entities = customers.Count, Performance = clockSaveChanges.ElapsedMilliseconds + " ms"});

        }

​

        using (var context = new EntityContext())

        {

            // BulkSaveChanges

            context.Customers.AddRange(customers);

            clockBulkSaveChanges.Start();

            context.BulkSaveChanges();

            clockBulkSaveChanges.Stop();

            BenchmarkResults.Add(new BenchmarkResult()

            {Action = "BulkSaveChanges", Entities = customers.Count, Performance = clockBulkSaveChanges.ElapsedMilliseconds + " ms"});

        }

​

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

    }

​

    public static void JustInTime_Compile()

    {

        var customers = GenerateCustomers(20);

        // SaveChanges

        using (var context = new EntityContext())

        {

            context.Customers.AddRange(customers);

            context.SaveChanges();

            context.Customers.RemoveRange(customers);

            context.SaveChanges();

        }

​

        // BulkSaveChanges

        using (var context = new EntityContext())

        {

            context.Customers.AddRange(customers);

            context.BulkSaveChanges();

            context.Customers.RemoveRange(customers);

            context.BulkSaveChanges();

        }

    }

​

    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;

        }

    }

}