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DllNotFoundException on .net 6 with python 3.12#2340

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software6ptk asked this question inQ&A

software6ptk

Mar 12, 2024

· 5 comments· 2 replies

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software6ptk
Mar 12, 2024

Environment

Pythonnet version: 3.0.3
Python version: 3.12
Operating System: Windows 11 pro
.NET Runtime: 6

Details

I am trying to setup pythonnet to run some python scripts in my c# app, but i'm getting the usual DllNotFoundException when setting the Runtime.PythonDLL variable

If i'm not wrong, both the python version and the .net runtime are supported so that shouldn't be the issue

this is what i do

stringdllpth=Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);dllpth+="\\Local\\Programs\\Python\\Python312\\python312.dll";Runtime.PythonDLL=dllpth;PythonEngine.Initialize();

i also tried

stringdllpth=Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);dllpth+="\\Local\\Programs\\Python\\Python312\\python312.dll";Environment.SetEnvironmentVariable("PYTHONNET_PYDLL",dllpth);PythonEngine.Initialize();

Errors are:

System.TypeInitializationException: 'The type initializer for 'Delegates' threw an exception.'Win32Exception: Impossibile trovare il modulo specificato.

and

System.TypeInitializationException: 'The type initializer for 'Delegates' threw an exception.'DllNotFoundException: Could not load C:\Users\***\AppData\Roaming\Local\Programs\Python\Python312\python312.dll.

with details:

System.TypeInitializationException  HResult=0x80131534  Messaggio=The type initializer for 'Delegates' threw an exception.  Origine=Python.Runtime  Analisi dello stack:   in Python.Runtime.Runtime.<>c.<Initialize>b__32_0()   in Python.Runtime.Runtime.TryUsingDll[T](Func`1 op)   in Python.Runtime.Runtime.Initialize(Boolean initSigs)   in Python.Runtime.PythonEngine.Initialize(IEnumerable`1 args, Boolean setSysArgv, Boolean initSigs)   in GeometriesVisualizer_EYESHOT.ScriptManager.RunLoaded(Object parameter) in C:\Users\***\ScriptManager.cs: riga 146   in GeometriesVisualizer_EYESHOT.MainWindow..ctor() in C:\Users\***\MainWindow.xaml.cs: riga 124   in System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean wrapExceptions)Eccezione interna 1:DllNotFoundException: Could not load C:\Users\***\AppData\Roaming\Local\Programs\Python\Python312\python312.dll.Eccezione interna 2:Win32Exception: Impossibile trovare il modulo specificato.

I already tried:

reinstalling python
changing build target to x64

I also searched online for a solution, but can't find anything besides changing the build target

Can you please help me?

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Replies: 5 comments 2 replies

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izhgtumekhanik
Jun 24, 2024

For Python x64 use x64 profile app (Any CPU - not working)

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DaveSkender
Aug 8, 2024

Is there a chance you're just not installing the package correctly?

# from your .csproj directorydotnet add package pythonnet

Or possibly Python itself? Sounds like Python wasn't added to your environment PATH variables. OurStock Indicators for Python QuickStart may help with more details on how to setup your environment, though our use case is a bit different.

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Gianmaria92
Oct 2, 2024

Hey,@software6ptk , did you solve the problem?

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mpulukkinen
Jan 19, 2025

I'm having ecapt same issue. Weird thing is that on my dev computer, I got it working. Then I updated my app's Flight in MS store and tested with my laptop: getting the dllNotFound whatever I do. Tried several different versions and also checked that maybe the python38.dll (or 310.dll) has some dependency missing, but no...

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mpulukkinen Feb 12, 2025

Actually, my issue was that one of the dependencies, msvc was not installed in target machine. I discovered when I ditched the pythonnet and starter running python just with process.start. So, it was actually one of the python scripts that failed to load the dll, but pythonnet completely "ate" the original error and made it look like the pythonnet.dll had some missing dependency. Pretty common case with c# and dependency dll load issues: the actual root cause gets lost in translation 😆

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sharafabacery
Feb 12, 2025

static void Main(string[] args){    Runtime.PythonDLL = @"python313.dll";    PythonEngine.Initialize();    using (Py.GIL())    {        // Import TensorFlow preprocessing script        string modulePath = @"D:\ocr_v1\ConsoleApp1\ConsoleApp1\AiNet";        dynamic sys = Py.Import("sys");        sys.path.append(modulePath);        // Import your Python module and use it        dynamic utils = Py.Import("utils");        // Process image and run model prediction        string imagePath = "D:\\ocr_v1\\ConsoleApp1\\ConsoleApp1\\AiNet\\20160805-130.webp";        dynamic result = utils.detect_and_process_id_card(imagePath);        Console.WriteLine($"Predicted Class: {result}");    }    PythonEngine.Shutdown();}

I used something like that and worked to me and I create configuration manger of X64 to be combatable with with my vs and here where python liveC:\Users\User\AppData\Local\Programs\Python\Python313

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