System.Private.Windows.Core is not included in the runtime pack

[hez2010]

.NET version

.NET 9 nightly

Did it work in .NET Framework?

Yes

Did it work in any of the earlier releases of .NET Core or .NET 5+?

No response

Issue description

System.Private.Windows.Core.dll is not included in the runtime pack, and leading to the below exception while running a self-contained published app.

Unhandled exception. System.IO.FileNotFoundException: Could not load file or assembly 'System.Private.Windows.Core, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. Specified file was not found.
File name: 'System.Private.Windows.Core, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
   at WinformsTest.Program.Main()

Steps to reproduce

dotnet new winforms
dotnet publish -c Release -r win-x64 --self-contained
cd bin\Release\net9.0-windows\win-x64\publish\
.\WinformsTest.exe

[elachlan]

@Olina-Zhang can your team confirm this please?

[Olina-Zhang]

@Olina-Zhang can your team confirm this please?

I didn't reproduce the problem with the .Net 9.0 Preview3 build machine at hand.

[hez2010]

Maybe it happens on the nightly build only?

[Olina-Zhang]

Maybe it happens on the nightly build only?

For the latest daily build, execute dotnet publish -c Release -r win-x64 --self-contained failed, I am not sure if it needs some config, cannot verify this issue.

[lonitra]

Tried to repro and got same results as above. Could not repro issue with .NET 9 preview 3 and could not verify with nightly build. I suspect that we do not publish nuget package for unreleased previews which is why the errors are produced. We had previously had an issue similar to this when we first introduced System.Private.Windows.Core, where the assembly was not present and needed to be, but this had since been fixed via dotnet/windowsdesktop#4084. Looked through the history there and it doesn't seem that we had regressed this behavior.

@hez2010 to clarify, had you experienced this issue on .NET 9 Preview 3, nightly build, or both?

[hez2010]

It's reproducing on the nightly build.
To publish the app with nightly build dotnet, you need to configure the nuget source:

<configuration>
  <packageSources>
    <add key="dotnet9" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json" />
  </packageSources>
</configuration>

I'm using 9.0.100-preview.5.24230.22.

[lonitra]

Fixed via dotnet/windowsdesktop#4366 in main and dotnet/windowsdesktop#4369 in preview 4

[MelonWang1]

Verified this issue in the latest .NET 9.0 preview4 SDK build: 9.0.100-preview.4.24266.28, it was fixed. Screenshot as below.

[Olina-Zhang]

Verified it in the latest .Net 9.0 Preview 5 SDK build: 9.0.100-preview.5.24273.4, it was fixed: System.Private.Windows.Core.dll is contained in application's publish folder, and app's EXE can be run.

[Zheng-Li01]

Verified the issue on 9.0.100-preview.5.24304.3 Test Pass build, the issue has been fixed that have the same results as above.