Explicit Reference Loading In Entity Framework On A Deleted Entity Doesn’T Seem To Be Working Mới Cập Nhật

When you load an entity in Entity Framework, either explicitly or implicitly, it is added to the Object Context’s cache. If you later delete that entity from the database, but still have a reference to it in your code, and then try to load it again using explicit loading, it will not work as expected. This is because the entity is still in the cache, but its state has been changed to “deleted”, so Entity Framework will not attempt to retrieve it from the database again.

To work around this issue, you can detach the entity from the Object Context’s cache before trying to reload it using explicit loading. You can do this by calling the Detach method on the Object Context and passing in the entity that you want to detach. This will remove the entity from the cache and allow you to reload it from the database using explicit loading.

Here is an example of how you can use the Detach method to reload a deleted entity using explicit loading:

scss
using (var context = new MyDbContext())
{
    var deletedEntity = context.MyEntities.FirstOrDefault(e => e.Id == entityId);

    // Delete the entity from the database
    context.MyEntities.Remove(deletedEntity);
    context.SaveChanges();

    // Detach the entity from the Object Context's cache
    context.Entry(deletedEntity).State = EntityState.Detached;

    // Reload the entity using explicit loading
    context.Entry(deletedEntity).Reference(e => e.MyNavigationProperty).Load();
}

In this example, we first retrieve the entity from the database using FirstOrDefault, and then delete it from the database using Remove. We then detach the entity from the Object Context’s cache using State = EntityState.Detached, and finally reload it using explicit loading by calling Reference and Load on the Entry object.