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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
Related to the problem reported in#1414
I.e. classes-in-classes are not handled properly in Pythonnet.
Even when applying the workaround mentioned in the#1414 issue there are still problems related to the inheritance.
Namely, I can not call a method declared on the baseclass, on an instance of the nested child class.
The following code demonstrates the issue
namespacepythonnet_testing{publicclassBar{publicstringMethodInBaseClass(){return"hello";}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')_ = pythonnet_testing.Bar # NOTE: The python code crashes unless this explicit reference to the Bar class is usedprint(f'Bar: {f.Bar}')print(f'Method call: {f.Bar.MethodInBaseClass()}') ";PythonEngine.Initialize();using(Py.GIL()){PythonEngine.Exec(pyCode);}}}
Running this gives the following error message
Trying to access member of nested subclassBar: pythonnet_testing.Bar+HejUnhandled exception. Python.Runtime.PythonException: AttributeError : 'Hej' object has no attribute 'MethodInBaseClass'[' File "<string>", line 7, in <module>\n'] at Python.Runtime.PythonException.ThrowIfIsNull(BorrowedReference reference) at Python.Runtime.PythonEngine.RunString(String code, Nullable`1 globals, Nullable`1 locals, RunFlagType flag)In order to call theMethodInBaseClass method on the child class, I must explicitly re-define it like this:
publicclassHej:Bar{publicnewstringMethodInBaseClass()=>base.MethodInBaseClass();}