Upgrade to run under VS 2022 17.4 with .NET 7 SDK

[HakanL]

What would you like to be added:

Upgrade the solution/projects to work with latest Visual Studio 2022 version 17.4 using .NET 7 SDK

Why is this needed:

The Todo solution is a great starting point for an Uno project, it should work with the latest tooling from Microsoft.

For which Platform:

For all platforms

Anything else we need to know?

It builds (after manually installing things, uno-check failed to install some dependencies), but I can't start the WinUI platform (Microsoft.ui.xaml.dll not found). WPF shows up as a blank app, and GTK/Skia doesn't list the todo items properly (null exception)

[HakanL]

Issues:

• WinUI: Exception of type 'System.InvalidOperationException' was thrown. during startup in BuildAppHost
• Wasm: Almost works, console errors when displaying todo items
• WPF: Blank window, no exceptions
• Gtk: Loads, but no todo items are displayed
• Ios: (remote simulator) app launches, I see the splash screen, then it crashes with System.Net.WebSockets.WebSocketException: 'Loading...'
• Android: Loads, but fails with System.Exception: 'Unable to find mock profile picture'

[dr1rrb]

@jeromelaban do we have some known issues regarding .net 7.0 yet ?

[jeromelaban]

Not that I know of, but obviously there are some :)

[nickrandolph]

Android mock profile issue - unoplatform/uno.extensions#927

[nickrandolph]

WPF - confirmed blank window showing - @MartinZikmund can you take a look at this please

I'm seeing similar rendering issue for GTK too:

[nickrandolph]

With iOS I'm able to get the app to render but am seeing an issue when navigating to list of tasks:

@carldebilly @kazo0 would you be able to take a look to resolve why we're seeing the issue with color

[kazo0]

The issue on the Task List page is due to the use of converters when setting the Background on the NavigationBar

The issue is here:
unoplatform/uno.toolkit.ui#381

I'll get the issue prioritized

[MartinZikmund]

@kazo0 @nickrandolph I can't remember whether this was fixed or not?

[kazo0]

@MartinZikmund the issue with converters and NavigationBar is still an issue 😢, will need to jump on this soon