[IronPython] Implementing an IronPython extension mechanism with abstract classes

Curt Hagenlocher curt at hagenlocher.org
Tue Sep 7 00:02:58 CEST 2010


In order for the virtual methods to be forwarded to Python, the C# class
that's generated by NewTypeMaker has to "bake in" code for all the methods.
You could probably write some Python-based checking code that examines a
Python class C and makes sure that all of the interfaces it derives from and
any abstract functions in its base class have Python implementations.


On Mon, Sep 6, 2010 at 10:27 AM, Michael Foord <fuzzyman at voidspace.org.uk>wrote:

>  Hello all,
>
> A friend was asking some advice about implementing an IronPython extension
> system for a C# application. He wanted to use C# abstract classes so that he
> would get an error attempting to instantiate a plugin class if it didn't
> implement all the required methods. (The extensions subclass his abstract
> class.)
>
> He pulled the Python class out of an extension script as a PythonType and
> instantiated it with engine.Operations.Call(PythonClass) - however this
> doesn't throw the exception he expected. (He does get MissingMember
> exceptions trying to call methods that don't exist however.)
>
> Can this be made to work or is there a better way to do "interface
> checking" of Python classes subclassing .NET types?
>
> All the best,
>
> Michael Foord
>
>
> --
> http://www.ironpythoninaction.com/
> http://www.voidspace.org.uk/blog
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