Microsoft.Toolkit.Uwp.Notifications not working in a .Net 5 webapi project

[davesmits]

Describe the bug

Create a .net 5 webapi and include Microsoft.Toolkit.Uwp.Notifications nuget. This will fail with error: error NETSDK1130: Referencing a Windows Metadata component directly when targeting .NETCoreApp,Version=v5.0 is not supported. Use the C#/WinRT projection tool (https://aka.ms/cswinrt) or a provided projection for this target.

• Is this bug a regression in the toolkit? If so, what toolkit version did you last see it work:

Steps to Reproduce

see above

Steps to reproduce the behavior:

1. create .net 5 webapi
2. include nuget
3. build the project

Expected behavior

Successful build and be able to use the classes to build my toast notification xml.

Visual Studio

• [ x ] 2019 (version: 16.8.1)

Hello davesmits, thank you for opening an issue with us!

I have automatically added a "needs triage" label to help get things started. Our team will analyze and investigate the issue, and escalate it to the relevant team if possible. Other community members may also look into the issue and provide feedback 🙌

[Kyaa-dost]

@davesmits This problem is most likely related to #3564

Can you please try removing the word 'native' in Microsoft.Toolkit.Uwp.Notifications.csproj and then try again?

[michael-hawker]

@Kyaa-dost I think we have two different issues related to the same package. One is for building it and this other one for consuming it.

@azchohfi you know anything about this message? I think we need a separate .NET 5 target, eh? Which until we resolve #3564 we can't generate?

[azchohfi]

Yes, we need a separate target for net5.0 since the way that 3.1 references WinMDs is different. This is a known breaking change from 3.1->5.0.

[michael-hawker]

@azchohfi the WinUI version of this package is only targeting .NET 5 and has the updates already right? So, when we ship the update for WinUI 3 preview 3 it should have all the new changes we just shipped in 7.0.0-preview4 too...

Info for that feed is here: https://github.com/windows-toolkit/WindowsCommunityToolkit/wiki/Preview-Packages#winui-3-previews

It currently has an older build, but should be updated today or tomorrow with the latest bits that should hopefully work on the released .NET 5.

[michael-hawker]

We're blocked by #3564 now, but once that's resolved, we should be able to update this package.

[michael-hawker]

@davesmits can you test out using the WinUI 3 Preview 3 package for this one package? Info here: #3295

That version is built for .NET 5 only, so it may resolve your scenario until we can get the 7.0.0 main branch updated for .NET 5 as well.

[davesmits]

yes will check this weekend

[davesmits]

@michael-hawker it's not working :(. I use it in a webapi to create the notifications I send my clients via WNS. I get this error during installation of the nuget package:

Did you guys considered to have a package with just the C# classes for generation of the content and a different one with the Windows stuff in?

[michael-hawker]

FYI @andrewleader I'm not sure exactly what's going on here, but as you dig into fixing the general issues with building on VS 16.8, it'd be good to run some of these tests for .NET 5 too. As mentioned, @azchohfi did a bit of this for the WinUI 3 branch, but doesn't seem generally compatible yet.