// Entity Framework Extensions

// Doc: https://entityframework-extensions.net/delete-by-key

​

// @nuget: Z.EntityFramework.Extensions

// @nuget: EntityFramework

​

using System.Linq;

using System.Text;

using System.Data.Entity;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int count = 3;

        SeedCustomers(count);       

        var customers = GenerateCustomers(count);

        using (var context = new EntityContext())

        {

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

            //DTO Object

            var customerDTO = context.Customers

                .Select(c => new CustomerDTO

                {

                    CustomerID = c.CustomerID,

                    Name = c.Name

                })

                .FirstOrDefault();

            context.Customers.DeleteByKey(customerDTO);

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

        }   

    }

    public static List<Customer> GenerateCustomers(int count) 

    {

        List<Customer>  list = new List<Customer>();

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

        {

            list.Add(new Customer() { CustomerID = (i + 1), Name = "Customer_" + i});

        }

        return list;

    }

    public static void SeedCustomers(int count) 

    {

        var customers = GenerateCustomers(count);

        new EntityContext().BulkInsert(customers, options => options.InsertKeepIdentity = true);

    }

    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 class CustomerDTO

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

    }

}