How to build .NET Standard based library for ARM architecture about standard HOT 6 CLOSED

The managed DLLs don't contain any architecture-specific code and you should be able to run them on all runtimes, provided you don't expect certain features to exists (e.g. directly accessing x64 hardware intrinsics in .net core libraries without checking for support on the current machine)

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Net Standard is by definition runtime-agnostic since it isn't even a runnable framework to begin with. In reality it is just an API spec that you can be guaranteed is implemented on all platforms that support it. If your library has API that should behave differently on ARM architecture, my suggestion would be to perform a runtime check when your method gets called so that if you are running on arm you do whatever you need to do like:

public void Foo()
{
  if (RuntimeInformation.ProcessArchitecture == Architecture.Arm)
  {
    // do your arm things
  }
  else
  {
    // ...
  }
}

This way your library is still platform-agnostic in the sense that it still works when consumed on arm vs other archs, but you can fork your implementation to react accordingly.

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Also, regarding cross-compiling for different RIDs, this is not supported by the SDK today. You can cross-compile for different frameworks (netcoreapp, net461, netstandard) but not for different Rids (linux, win, etc.)

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Thanks @joperezr We do not have anything in our library that needs to behave differently on ARM platform. Does that mean that our compiled code for a specific target framework ( netstandard2.0) will work on an ARM based device with no changes. I was under the impression that the dll that gets built would be different for x86/x64 vs ARM. Can you confirm this?

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Right, as @dasMulli points out you can assume that if you don't use anything that will be processor-specific then your library should already be working on arm.

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Closing issue as the question seems to be answered now, but @viralmodi feel free to reopen if you feel otherwise or if you have any follow ups, we are happy to help.

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