The .Net SDK 6.0.302 fail compiling MvvmGen projects using WPF

[thomasclaudiushuber]

The .Net SDK 6.0.302 fail compiling MvvmGen projects using WPF

[Dugnom]

Just to shorten your path, it seems to be a WPF issue.
You can see the progress on resolving the issue (and temporary workarounds) here: dotnet/wpf#6792

[Dragnalith]

@Dugnom thanks, you are correct. They answered that in the SDK ticket I have opened. It is fixed I will be released soon.

[Dragnalith]

@thomasclaudiushuber
.Net Core people told the bug has been fixed and it will be part of the next SDK release.

[Dugnom]

@mcgresearch your link is broken, I think you meant to link to https://github.com/dotnet/core/blob/main/release-notes/6.0/known-issues.md#issues-building-wpf-application-with-windows-desktop-607-and-608 . I add the text of the current md at time of writing for future reference at the end. Correct me if this is not the content you wanted to link to, I may have misunderstood your intention.

Issues building WPF application with Windows Desktop 6.0.7 and 6.0.8

Some customers are unable to build WPF applications with Windows Desktop 6.0.7 and 6.0.8, if they are including source generators coming from NuGet Packages, and receive errors similar to :

Rebuild started...
1>------ Rebuild All started: Project: ObservablePropertyTest, Configuration: Debug Any CPU ------
Restored C:\git\ObservablePropertyTest\ObservablePropertyTest.csproj (in 2 ms).
1>C:\git\ObservablePropertyTest\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator\__KnownINotifyPropertyChangedOrChangingArgs.cs(12,27,12,70): error CS0101: The namespace 'CommunityToolkit.Mvvm.ComponentModel.__Internals' already contains a definition for '__KnownINotifyPropertyChangedOrChangingArgs'
1>C:\git\ObservablePropertyTest\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator\__KnownINotifyPropertyChangedOrChangingArgs.cs(7,6,7,51): error CS0579: Duplicate 'global::System.CodeDom.Compiler.GeneratedCode' attribute
1>C:\git\ObservablePropertyTest\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator\__KnownINotifyPropertyChangedOrChangingArgs.cs(8,6,8,52): error CS0579: Duplicate 'global::System.Diagnostics.DebuggerNonUserCode' attribute
1>C:\git\ObservablePropertyTest\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator\__KnownINotifyPropertyChangedOrChangingArgs.cs(9,6,9,69): error CS0579: Duplicate 'global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage' attribute
1>C:\git\ObservablePropertyTest\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator\__KnownINotifyPropertyChangedOrChangingArgs.cs(10,6,10,51): error CS0579: Duplicate 'global::System.ComponentModel.EditorBrowsable' attribute
1>C:\git\ObservablePropertyTest\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator\__KnownINotifyPropertyChangedOrChangingArgs.cs(11,6,11,29): error CS0579: Duplicate 'global::System.Obsolete' attribute
1>C:\git\ObservablePropertyTest\CommunityToolkit.Mvvm.SourceGenerators\CommunityToolkit.Mvvm.SourceGenerators.ObservablePropertyGenerator\ObservablePropertyTest.TestVM.cs(12,23,12,33): error CS0102: The type 'TestVM' already contains a definition for 'TestString'
1>Done building project "ObservablePropertyTest_yynlzhol_wpftmp.csproj" -- FAILED.
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

This happened because WPF builds in 6.0.7 onwards, only considered source generators that were coming from nuget references. This caused an issue when there were source generators that were essentially coming via FrameworkReference. This issue has already been addressed in next release (6.0.9). However, the following workaround would unblock WPF builds.

Fix:

• To enable build in Windows Desktop 6.0.7, navigate to the directory containing the Microsoft.WinFx.targets file ( C:\Program Files\dotnet\sdk\6.0.302\Sdks\Microsoft.NET.Sdk.WindowsDesktop\targets )
• Add the following target in the file :

  <Target Name="RemoveDuplicateAnalyzers" BeforeTargets="CoreCompile">
      <ItemGroup>
          <FilteredAnalyzer Include="@(Analyzer->Distinct())" />
          <Analyzer Remove="@(Analyzer)" />
          <Analyzer Include="@(FilteredAnalyzer)" />
      </ItemGroup>
  </Target>    

[thomasclaudiushuber]

Thank you @Dragnalith and @Dugnom for your comments and for pointing to the WPF issue for this one. Hope it will be fixed soon, then I'll close this issue.

[mcgresearch]

See here https://github.com/dotnet/core/blob/main/release-notes/6.0/known-issues.md for a fix

[thomasclaudiushuber]

Closing this, as this seems to be fixed with more recent .NET SDKs.