8000 pythonnet fails to load netstandard2.1 library · Issue #1151 · pythonnet/pythonnet · GitHub
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philippdoersek opened this issue May 23, 2020 · 4 comments
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pythonnet fails to load netstandard2.1 library #1151

philippdoersek opened this issue May 23, 2020 · 4 comments

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@philippdoersek
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Environment

  • Pythonnet version: 2.4.1.dev0 (master-2166)
  • Python version: 3.7
  • Operating System: win10

Details

  • Describe what you were trying to get done.

If I compile a library using <TargetFramework>netstandard2.1</TargetFramework>, then trying to import any symbols from it fails. In contrast, when I compile using <TargetFramework>netstandard2.0</TargetFramework>, with the otherwise identical library, everything works fine.

Are there any plans to support netstandard2.1? What is required to get that working? I'm using the most recent master-2166 build from AppVeyor.

Apologies if this was raised already, I saw some separate discussions on other topics such as .net core, but none mentioning netstandard libraries.

    import clr
    clr.AddReference("My.Library.Name")
    from My.Library.Name import *
  • If there was a crash, please include the traceback here.

ModuleNotFoundError: No module named My.Library.Name
@filmor
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filmor commented May 23, 2020

AFAIK .NET Framework is not .NET Standard 2.1 compatible. As such, only a .NET Core build of Python.NET will be able to load a .NET Standard 2.1 library. This is being worked on, but it will take a while to land it in master.

@bmiller-pm
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I currently use this fork of PythonNet for my .Net Core apps.
https://github.com/henon/pythonnet_netstandard

This is built against .NET Standard 2.0. Perhaps our PythonNet gurus are waiting for .NET 5?
This is supposed to unify all standards - based on CoreFx.
https://devblogs.microsoft.com/dotnet/introducing-net-5/#:~:text=NET%20Core%20will%20con 8000 tinue%20to,each%20native%20platform%20from%20Xamarin.

@philippdoersek
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Thanks @QuickWire for pointing that out, that's actually quite interesting and good to know it exists. However, unless I'm mistaken, I don't think it will resolve my problem because I need the opposite direction (python -> .net, not .net -> python).

@filmor
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filmor commented Feb 14, 2021

.NET Core support is now merged, docs will follow soon (#984 contains an example).

@filmor filmor closed this as completed Feb 14, 2021
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@filmor @bmiller-pm @philippdoersek
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