ProjectReunion VS Avalonia

The issue is described here: WebView2 does not support passing in a CoreWebView2Environment · Issue #1170 · microsoft/WindowsAppSDK (github.com)

.. and how many of the Microsoft applications actually use WinUI3? As far as I can tell they're doing their own thing (Office) or are Electron (Teams) or, at least in Windows 10, haven't actually been updated from WinForms.

The overhead of WinUI3 is pretty huge. The visual designer, a winning feature of Visual Studio for decades, is AWOL. Why? It's XAML, the same as the previous XAML designer! It's just .. broken?

The backward compatibility story is a disaster: you can get stuck in the UWP sandbox https://github.com/microsoft/WindowsAppSDK/issues/1780

What's the big Microsoft WinUI3 flagship app, then? Something people are actually using? Rather than just a few system dialogues. (How many Win11 settings pop up a Win32 dialogue box, still?)

Development for WinAppSdk and WinUI 3 is also very slow and Microsoft seems to not want to push it and invest more developers into it for some reason. They try to improve the framework, is just it's a small team. For example it was a headacke to apply the Mica backgrop and required unmanaged code, they made it simpler and reduced it to a line of code but it took months. I have 2 out of 7 issues fixed on WinAppSdk repository and 0 out of 8 issues fixed in the WinUI 3 repository (some of the older than a year). This are just my issues, there are many other opened by other developers. So yeah, it wasn't fun at all. PoweshellSDK had an issue with the Import-Module command and it wasn't fixed for more than a year and probably won't be ever fixed, but I'm glad I found a workaround, even more clean and more safe, otherwise I couldn't have added the posibility to uninstall and change Store apps.

As far as I know, there are still some issues with OIDC integration. See this, for example.

this I'm interested in. WinAppSDK is open source.

I think the issue is actually the sandboxing and other stuff. WinRT StorageProvider API is known to be extremely slow and NTFS / Windows IO subsystem is itself already quite slow compared to UNIX. The issue IIRC is that StorageProvider is designed for sandboxing and the way they implemented that involves doing RPCs to other processes. So there's probably some heavy context switching involved, but it's architectural, and so the voice recorder was never fixed.

https://github.com/microsoft/WindowsAppSDK/issues/8

Disclaimer: I work for Microsoft. I even work on WindowsAppSDK just not the WinUI parts. People far more graphically inclined and talented than I handle that 😀

You might also want to look at AvaloniaUI[0] for a cross platform .NET GUI library. It is similar to WPF but much nicer to work with.

[0] https://github.com/AvaloniaUI/Avalonia

Production user here. There's no money gotchas. They're above reproach. In fact, I've received considerable free support from their devs on GitHub Issues [1].

The Avalonia business model is based on selling XPF, which runs WPF (Windows-only) apps on other platforms. That's very interesting to big corps with existing codebases.

See my comment [2]

[1] https://github.com/AvaloniaUI/Avalonia/issues

[2] https://news.ycombinator.com/item?id=39246988#39249128

Yes, but the portable GUI frameworks by Microsoft themselves are generally not very good, and they tend to be abandoned after a couple of years.

Avalonia is developed outside of the Microsoft corporate madness and seems to be slowly becoming the defacto cross-platform framework because it is expected to last a bit longer than a manager's attention span: https://avaloniaui.net/

Not my comment, but relevant here "The problem with compiling Skia to WASM is you'll lose any benefits of hardware graphics acceleration on the device."

(From https://github.com/AvaloniaUI/Avalonia/discussions/6831#disc... )

It's a bit of a hit and miss as of today. CLI, back-end and natively compiled libraries (think dll/so/dylib or even .lib/.a - you can statically link NAOT binaries into other "unmanaged" code) work best, GUI - requires more work.

Avalonia[0] and MAUI[1] have known working templates with it, but YMMV.

[0] https://github.com/lixinyang123/AvaloniaAOT / https://github.com/AvaloniaUI/Avalonia/ / honorable mention https://github.com/VincentH-Net/CSharpForMarkup

[1] https://github.com/dotnet/maui (try out with just true in csproj - it is known to work e.g. on iOS)

For desktop, Avalonia, hands down.

https://avaloniaui.net/

Open source, powered by Skia, backed by JetBrains, and quite battle-tested at this point for small to medium-sized apps. In theory perfectly capable for enterprise as well, since it's basically a spiritual successor to WPF, which has been an industry standard for about 15 years.

They're diving into mobile and WASM well, but that's more of a recent effort and I haven't tested that yet.