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Description
Environment
- Pythonnet version: 2.5.1
- Python version: Python 3.9.2
- Operating System: MacOS
- .NET Runtime: 5.0.200
Details
- Describe what you were trying to get done.
I am accessing a member of a nested C# class which inherits from the enclosing class.
When doing this, the Pythonnet runtime crashes!
Here is a minimal example:
namespacepythonnet_testing{publicclassBar{publicclassHej:Bar{}}publicclassFoo{publicBarBar;publicstaticFooCreate(){Foof=new();f.Bar=newBar.Hej();returnf;}}classProgram{staticvoidMain(string[]args){varpyCode=@"import pythonnet_testingf = pythonnet_testing.Foo.Create()print('Trying to access member of nested subclass')print(f'Bar: {f.Bar}') ";PythonEngine.Initialize();using(Py.GIL()){PythonEngine.Exec(pyCode);}Console.WriteLine("EXIT");}}}
This seem to be specifically for nested classes, where the object instance is created from the C# environment, and the class has not been explicitly referenced/used from python.
I have found a way to prevent the crash, by first explicitly using the nested class in the python code.
Eg instead of this:
importpythonnet_testingf=pythonnet_testing.Foo.Create()print('Trying to access member of nested subclass')print(f'Bar:{f.Bar}')
I insert a reference to the nestedBar.Hej class
importpythonnet_testingf=pythonnet_testing.Foo.Create()print('Trying to access member of nested subclass')_=pythonnet_testing.Bar.Hej# Explicitly referencing the nested classprint(f'Bar:{f.Bar}')
If I do this, then the Pythonnet runtime no longer crashes. It is even enough to reference the enclosing baseclassBar
_=pythonnet_testing.Bar# Explicitly referencing the enclosing classprint(f'Bar:{f.Bar}')
When I do this, the python code executes properly:
Trying to access member of nested subclassBar: pythonnet_testing.Bar+Hej