[IronPython] Trouble calling a method on a .NET object

Orian, Helmut helmut.orian at schema.de
Wed Jun 11 06:09:07 PDT 2008

I'm having trouble calling a method on one of my .NET objects.

if you compile the following repro into a "test.dll":

namespace Test {
	public interface ISomeInterface {
		string Greet();

	public abstract class Base {}
	public static class SomeFactory {
		public static object Get() {
			return new Concrete();

	internal class Concrete : Base, ISomeInterface {
		public string Greet() {
			return "Hello world!";

and try to use them:

>>> import clr
>>> clr.AddReference("test")
>>> from Test import *
>>> o = SomeFactory.Get()
>>> print("Greet" in dir(o))
>>> print(o.Greet())

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: expected ISomeInterface, got Base

To me it looks like a bug regarding collection of polymorphic
information on .NET types;
or am I missing something?



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