I have the following code:
<StackPanel>
<Button Content="Add Value" Command="{Binding AddValue}"/>
<TextBlock Text="Values:"/>
<ListBox ItemsSource="{Binding Values}"/>
</StackPanel>
partial class MainPage
{
public MainPage()
{
InitializeComponent();
DataContext = new MainPageViewModel();
}
}
public class MainPageViewModel : INotifyPropertyChanged
{
private ObservableCollection<string> _values = new ObservableCollection<string>() { "alpha", "beta", "gamma" };
public ObservableCollection<string> Values { get { return _values; } }
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged( string name )
{
if( null != PropertyChanged )
{
PropertyChanged( this, new PropertyChangedEventArgs( name ) );
}
}
public ICommand AddValue { get; private set; }
public MainPageViewModel()
{
AddValue = new RelayCommand( OnExecuteAddValue );
}
private void OnExecuteAddValue( object context )
{
Values.Add( "meow" );
}
}
I can verify that ExecuteAddValue is being called (hits breakpoint) and the Values collection is being updated with additional members, but the binding does not appear to be getting updated. I remember reading something earlier about ObservableCollection
bindings not working and there being a workaround. Can anyone point me to that post?
