Access C# code from Python

call_charp_from_Python.py

import clr
import sys
print sys.version

sys.path.append(r"C:\GIS")
lb = clr.AddReference('SampleClassLibrary') #add .dll file
from SampleClassLibrary import Calculator
c = Calculator()
print "Result is", c.DoSum(1,2)

#2.7.10 (default, May 23 2015, 09:44:00) [MSC v.1500 64 bit (AMD64)]
#Result is 3


#with nuget in VS - no need to install anything, works with standard Python installation
import ctypes
a = ctypes.cdll.LoadLibrary(r"c:\GIS\SampleClassLibrary.dll")
print a.add(3, 5)

#8

charp_classlibrary.cs

namespace SampleClassLibrary
{
    public class Calculator
    {
        public static int DoSum(int a, int b)
        {
            return a + b;
        }
    }
}

//or with UnmanagedExports nuget in VS

using RGiesecke.DllExport;
using System.Runtime.InteropServices;

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