// Entity Framework Extensions

// Doc: https://entityframework-extensions.net/pre-bulk-delete

​

// @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;

using Z.EntityFramework.Extensions;

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        GenerateData();

        EntityFrameworkManager.PreBulkDelete = (ctx, obj) => 

        {

            var list = obj as IEnumerable<Customer>;

​

            foreach (var customer in list)

            {

                customer.IsDeleted = true;

            }

​

            ctx.BulkUpdate(list);

​

            ((List<Customer>)obj).Clear();

        };

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("Before_BulkDelete", context.Customers.ToList());

            var list = context.Customers.Take(2).ToList();

            context.BulkDelete(list);

        }

        using (var context = new EntityContext())

        {

            FiddleHelper.WriteTable("After_BulkDelete", context.Customers.ToList());

        }

    }

    public static void GenerateData()

    {   

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Name ="Customer_A", IsDeleted = false });

            context.Customers.Add(new Customer() { Name ="Customer_B", IsDeleted = false });

            context.Customers.Add(new Customer() { Name ="Customer_C", IsDeleted = false });

            context.Customers.Add(new Customer() { Name ="Customer_D", IsDeleted = false });

​

            context.BulkSaveChanges();  

        }

    }

​

    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 IsDeleted { get; set; }

    }

}