Entity Framework won't detect changes of navigation properties

Question

I\'m having trouble with detecting changes of a navigation property:

My testing model looks like this:

public class Person
{
    public int Id { get;         


        

Answer 1

In my application, before a reload is requested or the user leaves the item/view, I perform some checks to make sure there are no unsaved changes.

This is basically running off the currently accepted answer, but I wanted to provide an implementation and bring to the attention that you must call Context.ChangeTracker.DetectChanges() before the ObjectContext.ObjectStateManager can pick up relationship changes! I spent quite a bit of time debugging this, silly!

_EagleContext.ChangeTracker.DetectChanges();

var objectContext = ((IObjectContextAdapter)_EagleContext).ObjectContext;
var changedEntities = objectContext.ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Deleted | EntityState.Modified);

if (_EagleContext.ChangeTracker.Entries().Any(e => e.State == EntityState.Modified)
    || changedEntities.Count() != 0)
{
    var dialogResult = MessageBox.Show("There are changes to save, are you sure you want to reload?", "Warning", MessageBoxButton.YesNo);
    if (dialogResult == MessageBoxResult.No)
    {
        return;
    }
}

// Continue with reloading...