c# - 監視可能なコレクションを持つ依存プロパティ

Question

    public IEnumerable<Location> Locations
    {
        get { return (IEnumerable<Location>)GetValue(LocationsProperty); }
        set { SetValue(LocationsProperty, value); }
    }

    public static readonly DependencyProperty LocationsProperty =
        DependencyProperty.Register("Locations", typeof(IEnumerable<Location>), typeof(userControl), new PropertyMetadata(null));  




  public class Location
    {
        public db.Location DbLocation { get; set; }
        public ObservableCollection<db.Person> DbContactsInLocation { get; set; }
    }

    Locations = myDataContext.Locations
       .Where(l => l.Active == "Y")
       .OrderBy(l => l.Name)
       .Select(l => new Location { 
               DbLocation = l
               **DbContactsInLocation = l.PersonLocations.Select(pl => pl.personLocation.person)**
                }).ToList();

私は得ています：

型 System.Collections.Generic.IEnumerable<myDataContext.Person>'を 'System.Collections.ObjectModel.ObservableCollection に暗黙的に変換できません<myDataContext.Person>' 明示的な変換が存在します (キャストがありませんか?)

何か案は？