RuntimeInformation.ProcessArchitecture is a lie on desktop

[MichalStrehovsky]

1. In Visual Studio 2017, create a new console app targeting .NET Framework 4.7.1 (you might need to grab the targeting pack).
2. Create a x64 solution configuration and switch to it.
3. Put this in Main(): Console.WriteLine($"Arch {RuntimeInformation.ProcessArchitecture}, IntPtr.Size: {IntPtr.Size}");
4. Run the app

Expected result:

Arch X64, IntPtr.Size: 8

Observed result:

Arch X86, IntPtr.Size: 8

[jeremyVignelles]

Hi,
I have exactly the same issue on .net framework 4.7.
After digging a little with dotPeek, I found that the code executed in GetArchitecture was not the same code as present in this repository.

The parameter int dwOemId is taken as input. By debugging, I see 0 in case of X86 and 9 in case of X64.
Then, the code runs ushort num = (ushort)(dwOemId >> 16);, which turns my 9 into a 0, causing the next code to detect a X86 processor.

How could this be fixed?

[ViktorHofer]

I don't understand why this is set to 2.1 as it is a bug in netfx? Setting it to future for now.

[MichalStrehovsky]

Fixed in .NET Framework 4.7.2.