Cannot Bind FlowItemSource about dltoolkit.forms.controls

[Willjobs94]

I installed Prism on the sample project and works great, but it did not work on my project. After that I put the same page and view model on both project (sample project and my project) and still not working, then I saw that I had a Xamarin.Forms update, so I just updated an cleaned my solution and now is working in my app. I didn't have to use FlowListView.Init() or XAML compiler, even thought I'll probably use the XAMLC at the end for optimization purpose.

Thank you very much for the feedback, I think I can close this issue now.

[daniel-luberda]

Do you have any code? Without it I can't help you. FlowListView works fine (just test example project).

[Willjobs94]

This is my list view
<flv:FlowListView x:Name="listview" FlowColumnCount="1" SeparatorVisibility="None" HasUnevenRows="false" FlowItemsSource="{Binding Items}"> <flv:FlowListView.FlowColumnTemplate> <DataTemplate> <Label HorizontalOptions="Fill" VerticalOptions="Fill" XAlign="Center" YAlign="Center" Text="Test" /> </DataTemplate> </flv:FlowListView.FlowColumnTemplate> </flv:FlowListView>

and I'm setting the items in my ViewModel constructor like this.
Items = new ObservableCollection<object> { new { } };
If I leave Items null the page load, if a put any object in the Items collection the page does not load. I've already cloned the project and check the example, but I didn't find the reason why mine is not working.

[daniel-luberda]

@Willjobs94 Works just fine for me. See this:

[Willjobs94]

Thats the thing, It works on the sample project, but I don't find what is missing on my project, that it does not work. I does not throw any exception, it just freeze my app.

[daniel-luberda]

If you use it XAML only, do you call FlowListView.Init() somewhere as stated here: https://github.com/daniel-luberda/DLToolkit.Forms.Controls/tree/master/FlowListView#faq

[Willjobs94]

Somewhere where ?, I tried putting on my code-behind page, and on my platform specific project, if I use the view without setting the item property I can navigate to the page, without error. the app stuck if I set the Items property and navigate to that page., I'm actually using a TappedPage and don't know if that is the problem.

[daniel-luberda]

Could you attach some sample project so I could check what's wrong? It's hard to predict.

Somewhere means anywhere, so the Xamarin linker would preserve dll from linking.

[Willjobs94]

This archive contains the view that have the problem, and where I'm using FlowListView.Init()
Archive.zip

[daniel-luberda]

You shouldn't put any lists inside ScrollView - that may be the reason.

[Willjobs94]

I tried removing it, but that's not the problem.

[daniel-luberda]

It's not a full solution, it can be anything. Does it work with a normal ListView?

[Willjobs94]

Yes

[daniel-luberda]

• Do you use XAML compilation?
• Could you make a full repro with it?
• Could you try to use a class instead object? Eg:

            Items = new ObservableCollection<ItemModel>
            {
                new ItemModel(),
                new ItemModel(),
                new ItemModel(),
            };

[Willjobs94]

• I do not use XAML compilation
• I can't make a public repo with the source code
• I already tried with class instance and got the same result.

[daniel-luberda]

• Please try to enable XAML compilation, maybe it will you show some compilation errors.
• The one page with the same view and model (prism, etc) would be just fine, so I can just test it. It may be something prism specific, are you sure you implemented INotifyPropertyChanged correctly? I can't see any calls or do you use Fody?

[Willjobs94]

I use Fody, but I even tried implementing it with Xamvvm like in the project samples and still not working. Let me try with XAML compilation and see what I get. Thanks for the fast feedback

[Willjobs94]

I tried XAMLC but it didn't work, and not exception or error found.

[daniel-luberda]

That's strange, I used this control with different MVVM frameworks and didn't have any problems yet. I am wondering what could be the cause of it. I pasted the code and it just worked fine in another solution. Didn't use it with PRISM yet though.

[Willjobs94]

Ok, let me try to use prism, on the sample project and see if that is the problem.

[daniel-luberda]

Thanks. If you have the sample project, feel free to mail it / send it to me. I'll try to debug it.