c# - Using objects deleted from context in Entity Framework

Question

Using code-first, I had doubts over what would happen if I obtained an object by querying the database, but kept using it after having it deleted or removed from the database.

For example, I performed this test:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication12
{
    class Program
    {
        static void Main(string[] args)
        {
            using (TestDB db = new TestDB())
            {
                Usuario myUser = db.Users.FirstOrDefault();

                if (myUser != null)
                {
                    Console.WriteLine(myUser.Name);
                    db.Users.Remove(myUser);
                    db.SaveChanges();
                    Console.WriteLine(myUser.Name);
                }
            }
        }
    }
}

The test worked and the same myUser.Name was printed to the console twice. With myUser by default being a tracked object, I expected the program to crash. However it seems that the objects with all its values persisted after it was removed. Did myUser essentially become a local object and stop being tracked by the context? Would it cause any problems should I return this deleted entity through a function and store it simply as a class attribute?

Answer 1

The object is still in memory, but what ypu have to know is its relation with the DbContext :

What you have to examine is the object state:

DbEntityEntry entry = context.Entry(myUser);
Console.WriteLine("myUser state: " + entry.State);

Run this code before removing, afetr removing, after saving changes... That's the entity lifecycle .