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Loading Python file in .NET and Call function
exzile edited this page Feb 1, 2023
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Hopefully this helps some of you out that are working with .NET core and this python.net library. The point of this sample code is to show you how to:
- Load your custom python file
- Execute a function that is with a class
In the program.cs (.net core 7) we can setup the startup python code. Make sure to replace yourname with your directory name: Program.cs snippet
Runtime.PythonDLL = @"C:\Users\[yourname]\AppData\Local\Programs\Python\Python39\python39.dll";
PythonEngine.Initialize();
Py.GIL();I have a folder in my ASP.NET project that is called PythonScripts that houses my python files. For this example I use a file called usb.py that contains a class (exampleClass) with one function (sayHello). We'll call that function and get the returned string. Finally we'll convert that returned PyObject to a string in c#.
// Python file is located in a project folder called PythonScripts
string file = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) + @"\PythonScripts\usb.py";
if (!PythonEngine.IsInitialized)// Since using asp.net, we may need to re-initialize
{
PythonEngine.Initialize();
Py.GIL();
}
using (var scope = Py.CreateScope())
{
string code = File.ReadAllText(file); // Get the python file as raw text
var scriptCompiled = PythonEngine.Compile(code, file); // Compile the code/file
scope.Execute(scriptCompiled); // Execute the compiled python so we can start calling it.
PyObject exampleClass = scope.Get("exampleClass"); // Lets get an instance of the class in python
PyObject pythongReturn = exampleClass.InvokeMethod("sayHello"); // Call the sayHello function on the exampleclass object
string? result = pythongReturn.AsManagedObject(typeof(string)) as string; // convert the returned string to managed string object
}