// Entity Framework Extensions

// Doc: https://entityframework-extensions.net/temporary-table

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

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

​

using System;

using System.Linq;

using Microsoft.EntityFrameworkCore;

using System.Collections.Generic;

using Microsoft.Data.SqlClient;

​

​

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        // TemporaryTableInsertBatchSize: Gets or sets the number of records to use in a batch when inserting in a temporary table. This number is recommended to be high.

        using (var context = new EntityContext())

        {

            context.Customers.AddRange(AddToList());

            context.BulkSaveChanges(options =>

            {

                options.TemporaryTableInsertBatchSize = 100;

            });

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable(context.Customers.Take(5).ToList());    

        }

    }

    public static List<Customer> AddToList()

    {

        var list = new List<Customer>();

        for (int i = 0; i < 1000; i++)

        {

            list.Add(new Customer() { Name ="Customer_" + i});

        }

        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 Boolean IsActive { get; set; }

    }

}