XamlC resolves x:DataType incorrectly

[mattleibow]

Description

This is partly a collection of issues and partly a more specific issue. Not sure if this is 100% a bug in all cases either.

XamlC uses the x:DataType="<type-name>" on <DataTemplate> to generate type-specific bindings, however, somce times the scope is incorrect or if the XAML is wrong but happens to match there is no exception and just fails silently.

In debug you can also get these errors using <_MauiForceXamlCForDebug>true</_MauiForceXamlCForDebug> but still no warnings or exceptions anywhere.

Steps to Reproduce

1. Clone https://github.com/mattleibow/maui-bug-repros/tree/repro-xamlc-datatype
2. Run
3. Observe that not all the collection views have items in them

Link to public reproduction project repository

https://github.com/mattleibow/maui-bug-repros/blob/repro-xamlc-datatype/MauiApp1/MainPage.xaml

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android, Windows, macOS, Other (Tizen, Linux, etc. not supported by Microsoft directly)

Affected platform versions

All versions

Did you find any workaround?

Make sure the x:DataType is specified correctly, and on every level of templates.

Relevant log output

No response

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[mattleibow]

@StephaneDelcroix thoughts?

[mattleibow]

This may have a simpler repro case: #13764

[danardelean]

Can you give some love (priority) to this issue (I created a duplicated one yesterday the one @mattleibow mentioned) ?

From what I see Compiled bindings don't actually work as compiled bindings in MAUI and this issue is 3 months old

Thanks

[Syed-RI]

Bump

[Syed-RI]

Bump

[danardelean]

Bump

[danardelean]

Trying to keep the issue alive :)