/// <summary>
/// Detaches the navigation properties.
/// </summary>
/// <param name="entry">The entry.</param>
/// <exception cref="ArgumentNullException">entry</exception>
public static void DetachNavigationProperties(this EntityEntry entry)
{
if (entry == null)
{
throw new ArgumentNullException(nameof(entry));
}
var parentEntities = new HashSet <object>();
entry.Detach(parentEntities);
}