How Can I Call C# Libraries from Python Without Using IronPython?

Calling C# Libraries from Python

Attempting to invoke C# libraries from Python has been a common issue. While options like IronPython may encounter compatibility challenges, an alternative approach is to call C# code from Python.

To achieve this, follow these steps:

Utilizing the UnmanagedExports NuGet Package

Integrate the "UnmanagedExports" NuGet package into your .Net project, as outlined at https://sites.google.com/site/robertgiesecke/Home/uploads/unmanagedexports.

Exporting Functions without COM

With "UnmanagedExports," you can export functions directly, bypassing the COM layer. Consider this sample C# code:

using System;
using RGiesecke.DllExport;

class Test
{
    [DllExport("add", CallingConvention = CallingConvention.Cdecl)]
    public static int TestExport(int left, int right)
    {
        return left + right;
    }
}

Loading and Invoking Exported Functions in Python (2.7)

In Python, you can load the DLL and call the exported methods as follows:

import ctypes
a = ctypes.cdll.LoadLibrary(source)
a.add(3, 5)

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