RuntimeInformation and OSPlatform class does not exist after Upgrading to .NET5.0

I do not know if this is a good place for this issue or not, but after updating the Microsoft.Extensions.DependencyInjection.Abstractions to version 5.0.0 it does not recognize the RuntimeInformation and OSPlatform classes.

This repo can reproduce this problem.

The strange thing is that these classes are available in versions 4.5 and 4.7, but not in 4.6!

[eerhardt]

Thanks for the investigation, @joperezr. I’m going to close this issue as “by design” since there isn’t a change needed in our NuGet packages.

@mjebrahimi - like @joperezr mentions above, you can resolve this by adding a PackageReference to https://www.nuget.org/packages/System.Runtime.InteropServices.RuntimeInformation. Thanks for reporting the issue. This information can unblock someone else if they run into the same problem.

[joperezr]

Actually just looked at it again and what was happening here before (and the reason why it worked) is that when folks used this package in net461 it was causing the netstandard facades to be includded in your project, which in this particular case was helping resolve these two types. That is why @eerhardt you don’t see a dependency explicitly on the RuntimeInformation package but it was still getting pulled in. Now this package doesn’t require the netstandard facades any longer (also resulting in your bin output folder for net461 to be much cleaner 😄) but that is also meaning in this particular case that these two types are not resolving. As explained above, a simple package Reference to the RuntimeInformation package should resolve this.