UWP - adding items to ListView dynamically cause crash - xaml

Question

I have a listview defined like this:
<ListView
x:Name="phonesListView"
Grid.Row="5"
Background="Black"
IsItemClickEnabled="True"
Foreground="Gray" >
<ListView.ItemTemplate>
<DataTemplate>
<Grid Width="auto" HorizontalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid
Grid.Row="0">
<Grid.ColumnDefinitions >
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<ComboBox
Grid.Column="0"
VerticalAlignment="Center"
Background="Black"
Foreground="White">
<ComboBoxItem Content="Home" IsSelected="True"/>
<ComboBoxItem Content="{Binding Type}"/>
<ComboBoxItem Content="Office"/>
<ComboBoxItem Content="Fax"/>
</ComboBox>
<Button
Grid.Column="1"
Height="30"
Width="30"
Foreground="Black"
Margin="0, 5, 0, 5"
HorizontalAlignment="Center" Click="RemovePhone">
<Button.Background>
<ImageBrush Stretch="Fill" ImageSource="Assets/appbar.close.png" />
</Button.Background>
</Button>
</Grid>
<TextBox
Grid.Row="1"
Background="White"
Foreground="Black"
FontSize="20"
InputScope="TelephoneNumber"
Text="{Binding Number}"/>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
I have an private ObservableCollection<Phone> numbers = new ObservableCollection<Phone>();
In constructor I call phonesListView.ItemSource = numbers;
And on some button click I want to add new item to the listView so I call a method:
private void AddPhone(object sender, RoutedEventArgs e) {
Phone phone = new Phone("", Types.HOME);
numbers.Add(phone);
}
But after button click to add a item the app crashes and App.g.i.cs is called and global::System.Diagnostics.Debugger.Break(); is highlighted
#if DEBUG && !DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION
UnhandledException += (sender, e) =>
{
if (global::System.Diagnostics.Debugger.IsAttached) global::System.Diagnostics.Debugger.Break();
};
#endif
I'm really new to Universal Windows App, and I read that this is called when something is wrong with XAML code. Could you help me with that? Thanks.

Answer 1

I tried to use ItemsSource="{x:Bind Mode=TwoWay}"
The only way (but not the best, I think) where I could dynamically update a listview was making a method that handle a button event where I add a new element (calling the addmethod) and updating the ItemsSource property of the list view.
private void AnadeDoctorAppBarButton_Click(object sender, RoutedEventArgs e)
{
Doctor A = new Doctor("Mapache", "dentista", "La calle", "La vida", "Lo que sea", "Direccion", "olos");
ViewModel.AnadeDoctor = A;
ListaDePrueba.ItemsSource = ViewModel.ColeccionDoctores;
}
It Works, but I think that is not true Databinding.