EFE - Request - PreBulkDelete

CSharp · Console

/Program.cs

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

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

using System;
using System.Linq;
using System.Data.Entity;
using System.Collections.Generic;
using Z.EntityFramework.Extensions;

public class Program
{
	public static void Main()
	{
		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() : base(FiddleHelper.GetConnectionStringSqlServer())
		{

		}
		
		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; }
	}
}