.NET Standard RuntimeInformation doesn't have RuntimeIdentifier property

[MV10]

Description

I am updating a NET Standard 2.0 library to .NET 8 packages due to vulnerabilities in .NET Core 2.1 dependencies.

The project involves cross-platform library loading, and under .NET Core 2.1 it relied upon GetRuntimeIdentifier() to determine the RID. There was a breaking change to RID usage in .NET 8. Since I'm not currently equipped to test cross-platform functionality, I wanted to use the <UseRidGraph> workaround to revert to the old functionality.

However, the API also changed and now I must read the RuntimeInformation.RuntimeIdentifier property (same page as the "workaround" link above) instead of calling GetRundtimeIdentifier().

Unfortunately that property doesn't appear to be provided even though the docs say it is part of netstandard.dll:

Reproduction Steps

Create a .NET Standard 2.0 class library.

Modify the csproj to add UseRidGraph:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <RootNamespace>Issue_RuntimeIdentifier</RootNamespace>
  </PropertyGroup>

  <PropertyGroup>
    <UseRidGraph>true</UseRidGraph>
  </PropertyGroup>
	
</Project>

Reference the property in code:

using System.Runtime.InteropServices;
namespace Issue_RuntimeIdentifier
{
    public class Class1
    {
        public string GetRID() 
            => RuntimeInformation.RuntimeIdentifier;
                               // ^^ CS0117: 'RuntimeInformation' does not contain a definition for 'RuntimeIdentifier'
    }
}

Expected behavior

RuntimeIdentifier property should exist.

Actual behavior

CS0117: 'RuntimeInformation' does not contain a definition for 'RuntimeIdentifier'

Regression?

Unknown if this is a regression.

Known Workarounds

No known workaround.

Configuration

.NET 8 (whatever is current) ... don't think other details are likely relevant.

Other information

I don't think it'll help much, but you can see the code in context here.

[MihuBot]

Possible related and/or duplicate issue:

• [.NET 9] RuntimeInformation.RuntimeIdentifier includes unexpected OS details on Linux repo installs #114156

[huoyaoyuan]

The property is never included in .NET Standard, as documented:

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/interop-contrib
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[MV10]

Does this mean the docs are incorrect?

https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.runtimeinformation.runtimeidentifier?view=net-8.0

[MV10]

Disregard, I see I'm looking at .NET 8 and you're looking at .NET Standard.
(Got confused, when I try to go to .NET Standard from the RID property, it redirects to a .NET page which does have it...)

[teo-tsirpanis]

I took a look at your library. If I were you, I would have dropped .NET Standard 2.0 support and just targeted .NET 8; interop is one of the areas where supporting downlevel frameworks is the hardest. Then, you can use RuntimeInformation.RuntimeIdentifier just fine, but also remove the LibraryLoader classes, and replace them with the NativeLibrary API.

Either way, I'm going to close this issue as by design, because RuntimeInformation.RuntimeIdentifier is not available on .NET Standard. The definitive source for an API's framework availability is the "Applies to" section at the bottom of the page: