XF5 Prev4: PopUp with ListView / CollectionView not working

[HarryLobster]

I have successfully implemented the IDialogService into my App to have modal Dialogs.
Now I wanted to develop a DialogPicker that includes a ListView or a CollectionView for the Items to pick.
But when I do that, the Page is showing up but contains nothing at all, I mean not even the Label.

This does not work:

<Label Text="Test"/>
<CollectionView></CollectionView>

This works:

<Label Text="Test"/>

I don´t know yet if it is a bug, a missing feature or myself. I wanted to start with a simple question...

[dansiegel]

Generally with issues like this it's best to have a sample app that people can look at to run and help you see what you're doing wrong or identify an actual bug if one exists.

[Tum4ik]

I have the same problem. I'll try to provide the example.

[Tum4ik]

Here we go: https://github.com/Tum4ik/prism-dialogservice-problem
When you start the project and press the "Test Dialog" button you will notice there are two items in the list view, but they are empty.

However, you can force it to show the text via "Hot reload":
in the ListSelectionDialog.xaml file change the line during debug session with hot reload enabled

<!-- From --><TextCell Text="{Binding}" TextColor="Black"/>
<!-- To --><TextCell Text="{Binding .}" TextColor="Black"/>

You will see the text appears in the list view items.

[Tum4ik]

So, can anybody please say what it is? Should we create a bug may be? @dansiegel @brianlagunas

[Tum4ik]

Wow, got it working via changing

<!-- From --><TextCell Text="{Binding}" TextColor="Black"/>
<!-- To --><TextCell Text="{Binding BindingContext, Source={RelativeSource Self}}" TextColor="Black"/>

So strange...

Also I have a real project and now the data template looks like:

<DataTemplate>
  <ViewCell x:Name="ViewCell">
    <Grid ColumnDefinitions="Auto, *">
      <skia:SKCanvasView Grid.Column="0" />
      <Label Grid.Column="1"
             Text="{Binding BindingContext, Source={x:Reference ViewCell}, Converter={StaticResource SupportedLocalizationToNativeNameConverter}}"
             HorizontalTextAlignment="End"
             VerticalTextAlignment="Center" />
    </Grid>
  </ViewCell>
</DataTemplate>

[Tum4ik]

It seems to me that the binding inside the data template at the initialization is connected to the dialog binding context instead of view cell binding context.