Entity Framework 4.1: How do I delete by object Id

Question

I would like to know how to delete an object from Entity Framework 4.1 without first having to load the object from the database. I have found these other 2 answers on Stack Ove

Answer 1

Just to convince you that your first code snippet must work here is a simple example you can copy, paste and test:

• Create a new console application project (.NET 4)
• Add reference to EntityFramework.dll (EF 4.1)
• Delete the content of Program.cs and paste in the following:

->

using System.Data.Entity;

namespace EFDeleteTest
{
    public class Car
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }

    public class MyContext : DbContext
    {
        public DbSet Cars { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // Database with name "EFDeleteTest.MyContext"
            // will be created automatically in SQL Server Express

            int carId = 0;
            using (var context = new MyContext())
            {
                var car = new Car { Name = "Test" };
                context.Cars.Add(car);
                context.SaveChanges();

                carId = car.Id;
            }
            //Make breakpoint here and check that the car is indeed in the DB

            using (var context = new MyContext())
            {
                var car = new Car() { Id = carId };
                context.Cars.Attach(car);
                context.Cars.Remove(car);
                context.SaveChanges();
            }
            //Make breakpoint here and check that the car
            //indeed has been deleted from DB
        }
    }
}

If you have a SQL Server Express DB it will automatically create the DB.

Perhaps this might help you to compare with your code because it looks as if something not visible in your code fragments is causing the different behaviour you describe.