PythonNET unknown kwargs being discarded

[dmitry-medvedev]

Environment

• Pythonnet version: 3.0.3
• Python version: 3.11
• Operating System: Windows 10
• .NET Runtime: .NET 8.0

Details

When accessing a .NET function using PythonNET, if a kwarg is incorrect or doesn’t exist, it is discarded by the PythonNET execution engine

If I have a .NET function like this:

Public Function SomeFunction(name as String, age as String) as String
    Return $"{name} - {age}"
End Function

And I call it in PythonNET like this:

if __name__ == "__main__":
    name = "John"
    age = "3"
    SomeFunction(name, age=age, fake_arg="something")

The fake arg is discarded, and no error or exception is thrown. Python compiles as if the additional kwarg were not there. In this situation, normal Python would be throwing a TypeError.

This is an issue with a multiple kwargs in the methods/functions is that a user can easily misspell and result in unexpected behavior.

PythonDemo.zip