CsWinRT 1.5.0 generates incorrect projections on .NET 6

[aov-mx]

Describe the bug C:\myproj\obj\x64\Debug\net6.0-windows\Generated Files\Windows.Foundation.Collections.cs(560,23,560,28): error CA2257: The 'ABI.Windows.Foundation.Collections.IMapChangedEventArgs<K>.Vftbl' member on the 'ABI.Windows.Foundation.Collections.IMapChangedEventArgs<K>' type should be marked 'static' as 'ABI.Windows.Foundation.Collections.IMapChangedEventArgs<K>' has the 'DynamicInterfaceImplementationAttribute' applied

To Reproduce

1. Create a net6.0-windows project
2. Add the following lines to the csproj:

  <PropertyGroup>
    <CsWinRTWindowsMetadata>sdk</CsWinRTWindowsMetadata>
    <!-- Actual classes we use and their dependencies -->
    <CsWinRTIncludes>
      Windows.Foundation;
      Windows.Security.Credentials.ICredentialFactory;
      Windows.Security.Credentials.IPasswordCredential;
      Windows.Security.Credentials.IPasswordVault;
      Windows.Security.Credentials.PasswordCredential;
      Windows.Security.Credentials.PasswordVault;
    </CsWinRTIncludes>
    <!-- Exclude unused Foundation namespaces that require much more stuff -->
    <CsWinRTExcludes>
      Windows.Foundation.Diagnostics;
      Windows.Foundation.Numerics;
    </CsWinRTExcludes>
  </PropertyGroup>

3. Compile

Expected behavior The code compiles.

Version Info CsWinRT 1.5.0 .NET SDK 6.0.102 Windows SDK 10.0.19041.0

Additional context This used to compile on CsWinRT 1.3.5 and net5.0-windows.

[angelazhangmsft]

@A-Ovchinnikov-mx, can you try setting the following property in your project as a workaround as documented in Code analysis in .NET?

<PropertyGroup>
  <CodeAnalysisTreatWarningsAsErrors>false</CodeAnalysisTreatWarningsAsErrors>
</PropertyGroup>

By default, the CA2257 rule should be showing up as a warning and should not cause any runtime issues. But we will need to investigate if there is a way to disable the warning.