// Entity Framework Extensions - Main Features - Bulk Extensions

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

​

// @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;

public class Program

{

    public static void Main()

    {

        // 100+ options to customize your saves

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        // Insert only customers that don't exist with a custom key

        using (var context = new EntityContext())

        {

            var customers = new List<Customer>();

            customers.Add(new Customer() { Code = $"Info", Name = "Support Team", Email = "info@zzzprojects.com" });

            customers.Add(new Customer() { Code = $"Sales", Name = "Sales Team", Email = "sales@zzzprojects.com" });

            // Insert 2 existing customers

            context.BulkInsert(customers);

            // Add some generic customers

            for(int i = 0; i < 5; i++)

            {

                customers.Add(new Customer() { Code = $"Customer_{i}", Name = $"Name_{i}", Email = $"Name_{i}@invalid.com" });

            }

            FiddleHelper.WriteTable("1 - Customers Before", context.Customers.AsNoTracking());

            // Insert only customers that don't exist with a custom key

            context.BulkInsert(customers, options => { 

                options.InsertIfNotExists = true;

                options.ColumnPrimaryKeyExpression = customer => new { customer.Code };

            });

            FiddleHelper.WriteTable("2 - Customers After", context.Customers.AsNoTracking());

        }

        // Merge (Upsert) with related child entities (Order, OrderItem)

        using (var context = new EntityContext())

        {

            var orders = new List<Order>();

            // Order #1

            orders.Add(new Order() { Number = "Order #1", Items = new List<OrderItem>() {

                new OrderItem() { Quantity = 1, ProductName = "Entity Framework Extensions" }

            }});

            // Order #2

            orders.Add(new Order() { Number = "Order #2", Items = new List<OrderItem>() {

                new OrderItem() { Quantity = 1, ProductName = "Dapper Plus" },

                new OrderItem() { Quantity = 1, ProductName = "C# Eval Expression" }

            }});

            // Merge (Upsert) with related child entities (Order, OrderItem)

            context.BulkMerge(orders, options => {

                options.IncludeGraph = true;

            });

            FiddleHelper.WriteTable("3 - Order/OrderItem After", context.Orders.Include(x => x.Items).AsNoTracking());

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

        public DbSet<Customer> Customers { get; set; }

        public DbSet<Order> Orders { get; set; }

        public DbSet<OrderItem> OrderItems { get; set; }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

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

​

            base.OnConfiguring(optionsBuilder);

        }

    }

​

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Code { get; set; }

        public string Name { get; set; }

        public string Email { get; set; }

    }

    public class Order

    {

        public int OrderID { get; set; }

        public string Number { get; set; }

        public List<OrderItem> Items { get; set; }

    }

    public class OrderItem

    {

        public int OrderItemID { get; set; }

        public int Quantity { get; set; }

        public string ProductName { get; set; }

        public Order Order { get; set; }

    }

}