You have to decorate the methods you want to expose to .net with the clrmethod decorator, e.g. class MyClass(IInterface): @clrmethod(int, [str]) def overridden_method(self, x): return len(x) The parameters to the clrmethod decorator are the method return type and argument types. You can expose properties similarly using the clrproperty decorator. See runtime/resources/clr.py for details. regards, Tony On Wed, Mar 16, 2016 at 9:29 PM Hansong Huang wrote:

This might be an obvious problem out of my lack of understanding how Python.Net work.

I am exploring the possibility of program WPF ViewModel.

After resolving the problem inheriting .Net interface class,

class ViewModel(System.ComponentModel.INotifyPropertyChanged): __namespace__ = "WPFPy" ....

class MyViewModel(ViewModel): .... here to implement follow ironpython examples

then assign it to DataContext

self.window = System.Windows.Markup.XamlReader.Load(outStream) self.window.DataContext = MyViewModel()

this does not seem to work, the property/method in MyViewModel is never called nor any data binding happened.

I was able to get ExpandoObject work well though and binding works fine self.window.DataContext = System.Dynamic.ExpandoObject()

so, that makes me asking if it makes sense at all to pass a Python class object back into .Net framework and expect it works -- even if the proper interface is implemented.

thanks

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