Databinding UI not updating

Question

Hi

 

I’m having some trouble figuring out this databinding. I’ve added my binding object in the app.xaml.cs file and assign it to the DataContext in my MainPage

   public MainPage()

        {

            this.InitializeComponent();

 

            this.DataContext = ((App) (App.Current)).SmsMessage;

My SmSMessage has a property List<Receivers> Receivers and in my Appbar I have a gridview that binds to the receivers

<GridView Name="ReceiversGridView" ShowsScrollingPlaceholders="False" Height="65" Width="auto" ItemsSource="{Binding Path=Receivers, Mode=TwoWay}"

SelectionMode="Single" IsSwipeEnabled="False" DragItemsStarting="ReceiversGridView_OnDragItemsStarting" CanDragItems="True" >

The SmsMessage class implements INotifyPropertyChanged.

  public class SmsMessage : INotifyPropertyChanged

    {

        private string _message;

        private string _senderInitial;

        private int _messageLenght;

        private string _receiversCount;

        private DateTime _sendLaterDate = DateTime.Now;

        private TimeSpan _sendTime = DateTime.Now.TimeOfDay;

        private bool _sendLater;

        private bool _toLong;

        private int _totalMessages;

        private List<Receiver> _receivers;

  public List<Receiver> Receivers

        {

            get

            {

                if (_receivers == null)

                {

                    _receivers = new List<Receiver>();

                }

                return _receivers;

            }

            set

            {

                _receivers = value;

                OnPropertyChanged("Receivers");

            }

        }

 
My Receiver Class also implements INotifyPropertyChanged

  public class Receiver : INotifyPropertyChanged

    {

        private string _displayName;

        private string _initialer;

        private string _mobil;

        private string _afdeling;

        private byte[] _photo;

        private ImageSource _imageSource;

When I drag an ithem out of the gridview and drops it I remove the item from the Receivers list (this part works fine) but my Ui dosen't update

see image for dragging

Why is the UI not updating?

/Jacob

Answer 1

I think you need an ObservableCollection rather than List.

---

Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 2

Thanks :-D