How to Load a C# Dll in Python

How to load a C# dll in python?

This is to answer the second part of your Question
Try making the DLL COM visible.

by using the

[ComVisible(true)]

Ok IronPython is a .net implemenatation of the Python language
The technology is going to use the DLR of the .net 4.0 when it arrives so IronPython will have more Dynamism (is that a word).
(In english if you're a Python guru, you'll feel more at home when you use IronPython)

So you may well choose IronPython, if you do that you can skip the COM visible part. Since both (C# , Iron Python) are under .Net

http://ironpython.net/

Access a function present in C# dll using Python

You haven't made the function visible in the DLL.

There are a few different ways you can do this. The easiest is probably to use the unmanagedexports package. It allows you to call C# functions directly like normal C functions by decorating your function with [DllExport] attribute, like P/Invoke's DllImport. It uses part of the subsystem meant to make C++/CLI mixed managed libraries work.

C# code

class Example
{
     [DllExport("ExampleFunction", CallingConvention = CallingConvention.StdCall)]
     public static int ExampleFunction(int a, int b)
     {
         return a + b;
     } 
}

Python

import ctypes
lib = ctypes.WinDLL('example.dll')
print lib.ExampleFunction(12, 34)

Accessing C# DLL through Python 3.8 using Python.Net (TypeError)

Solution: The classes must be static as I'm not creating a new instance within the python script.

Use .NET dll in Python

Just as a plain and simple answer for others which I was struggling to find.

The dll location needs to be added to the path variable. This can be done simply by importing sys, and invoking the method shown (the path should not include the dll file).

You can then use your dll with Python for .NET (impot clr), by setting up the reference with the AddReference method. Then you're dll is ready to go! An example:

import sys
import clr

sys.path.append(r"C:\Users\...")

clr.AddReference("MyDll")

from mynamespace import myclass

x = myclass()

Use C# DLL in Python

PROBLEM CAUSE:
Python didn't run wrapper from directory where it was stored together with driver. That caused problem with loading driver.

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