// Entity Framework Extensions

// Doc: https://entityframework-extensions.net/bulk-insert-optimized

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

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

​

using Microsoft.EntityFrameworkCore;

using System;

using System.Collections.Generic;

using System.Linq;

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 customers

        var customers = GenerateCustomers(5000);

        var clockBulkInsert = new Stopwatch();

        var clockBulkInsertNoOutput = new Stopwatch();

        var clockBulkInsertOptimized = new Stopwatch();

        using (var context = new EntityContext())

        {

            // BulkInsert

            clockBulkInsert.Start();

            context.BulkInsert(customers); // performance can be improved with options

            clockBulkInsert.Stop();

​

            BenchmarkResults.Add(new BenchmarkResult() { Action = "BulkInsert (Outputting values)", Entities = customers.Count, Performance = clockBulkInsert.ElapsedMilliseconds + " ms" });

        }

        using (var context = new EntityContext())

        {

            // BulkInsert (without outputting)

            clockBulkInsertNoOutput.Start();

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

            clockBulkInsertNoOutput.Stop();

​

            BenchmarkResults.Add(new BenchmarkResult() { Action = "BulkInsert (Not Outputting values)", Entities = customers.Count, Performance = clockBulkInsertNoOutput.ElapsedMilliseconds + " ms" });

        }

        using (var context = new EntityContext())

        {

            // BulkInsertOptimized

            clockBulkInsertOptimized.Start();

            // similar of doing: context.BulkInsert(customers, options => options.AutoMapOutputDirection = false);

            context.BulkInsertOptimized(customers);

            clockBulkInsertOptimized.Stop();

​

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

        }

        FiddleHelper.WriteTable(BenchmarkResults);

    }

    public static void JustInTime_Compile()

    {

        var customers = GenerateCustomers(20);

        // BulkInsert

        using (var context = new EntityContext())

        {

            context.BulkInsert(customers);

            // Clean

            context.BulkDelete(customers);

        }

​

        // BulkInsertOptimized

        using (var context = new EntityContext())

        {

            context.BulkInsertOptimized(customers);

            // Clean

            context.BulkDelete(customers);

        }

    }

    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 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; }

    }

}