CA1416. How to tell builder that only platform is Windows?

Question

You can mark each windows-specific method with System.Runtime.Versioning.SupportedOSPlatformAttribute e.g.

[SupportedOSPlatform("windows")]
public static void Foo()
    => Thread.CurrentThread.SetApartmentState(ApartmentState.STA);

Mark entire assembly with in AssemblyInfo (if you have one)

[assembly: System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")]

Or edit .csproj file to target windows-specific version of dotnet to make these changes automatic

<TargetFramework>net5.0-windows</TargetFramework>