[Python] How can I call python script in c#?

I'm working on a project which needs to call python script in c#. The fact is that I'm familiar with python, but not c#, not at all.

As I have learnt, there are basically two options: Iron and Python.net, you can check it out here https://www.youtube.com/watch?v=oG5mmElsWJM&lc=UgzwcXvIteCqTjmHl2N4AaABAg.9Ls9q7VkDdc9MCYIPfOW0d. I'm struggling with python.net now. I've tried to call a simple multiply function (e.g. a * b), works perfect. But when I turned to image data, there pops up an error called "The type initializer for 'Delegates' threw an exception."

The python script I used is:

import cv2
import numpy as np

def binarise(image):
ret, img_output = cv2.threshold(image,100,255,cv2.THRESH_BINARY)
return img_output


The c# I tried is:

if (greyImage1 != null)
{
try
{
var pythonPath = @"C:\Users\Admin\anaconda3";

Environment.SetEnvironmentVariable("PATH", $@"{pythonPath};" + Environment.GetEnvironmentVariable("PATH"));
Environment.SetEnvironmentVariable("PYTHONHOME", pythonPath);
Environment.SetEnvironmentVariable("PYTHONPATH ", $@"{pythonPath}\Lib");

string scriptFile = "myfunction.py";
string pythonCode = "";
using (var streamReader = new StreamReader(scriptFile, Encoding.UTF8))
{
pythonCode = streamReader.ReadToEnd();
}

using (Py.GIL())
{
var scope = Py.CreateScope();
scope.Exec(pythonCode);
greyImage1 = (scope as dynamic).binarise(greyImage1);
pictureBox1.Image = (System.Drawing.Image)greyImage1;
this.Cursor = Cursors.Default;
}
}
catch (Exception ex) { messageL.Text = ex.Message; }
}


Anyone got any ideas? Appreciate your time and help.

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