C#•3y ago

❔ C# library usable from python

I was wondering how to do this, and stumbled upon https://stackoverflow.com/a/29854281 which answered the question, but then caused two new ones. 1. can this be done without .NET installed on the user's machine 2. how do I create a project for that in VS? Do I just choose class library or something else?

Stack Overflow

Calling a C# library from python

Anyone can share a working example on how to call a simple C# library (actually its WPF) from python code? (I have tried using IronPython and had too much trouble with unsupported CPython library my

17 Replies

ero•3y ago

in current year you would probably use NativeAOT

static class Exports
{
  [UnmanagedCallersOnly(EntryPoint = "add")]
  public static int Add(int a, int b) => a + b;
}

static class Exports
{
  [UnmanagedCallersOnly(EntryPoint = "add")]
  public static int Add(int a, int b) => a + b;
}

<PublishAot>true</PublishAot>

<PublishAot>true</PublishAot>

dotnet publish -c Release -r win-x64 and then you can call that like you would any other c or c++ library (however that may be done in python)

PillowOP•3y ago

oh amazing no .NET needed once published?

ero•3y ago

yup

PillowOP•3y ago

ooo oh and one last thing, how do I create a project for this in VS2022, what option do I choose?

reflectronic•3y ago

that answer is a little bit outdated oh, the chat didn’t scroll 😰 you would just make a class library project

PillowOP•3y ago

alr ty!

reflectronic•3y ago

adding PublishAot to the csproj file is all you need to enable it when you dotnet publish you’ll get the self-contained DLL file that you can use from python

PillowOP•3y ago

alright amazing, thank you both!!

reflectronic•3y ago

you need to install the C++ tools if you haven’t already

PillowOP•3y ago

i've got that yep it doesn't seem to want to work, is this c# correct?

using System.Runtime.InteropServices;

namespace ToasterMap
{
    static class ToasterMap
    {
        [UnmanagedCallersOnly(EntryPoint = "add")]
        public static int Add(int a, int b) => a + b;
    }
}

using System.Runtime.InteropServices;

namespace ToasterMap
{
    static class ToasterMap
    {
        [UnmanagedCallersOnly(EntryPoint = "add")]
        public static int Add(int a, int b) => a + b;
    }
}

and i've got the <PublishAot>true</PublishAot> in the propertygroup in the csproj

ero•3y ago

and you're actually publishing? and not just building?

PillowOP•3y ago

running dotnet publish -c Release -r win-x64

PillowOP•3y ago

and checking via dumpbin, there seems to be nothing

ero•3y ago

maybe i'm wrong but i'm pretty sure nativeaot was only added in .net 7

PillowOP•3y ago

ahhhh i'm running 6 do I need to update or can I use something else?

PillowOP•3y ago

YES!! I just needed .net 7!!

Accord•3y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ C# library usable from python

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