I tried:

 

import System

import System.Windows

 

@clr.clrmethod([System.object, System.Windows.RoutedEventArgs])

def OnStartButton(sender,args):

    #do stuff

    pass

 

and get: ‘Cannot perform runtime binding on a null referenceAttributeError : object’

 

So I tried subscribing to the Click event from the Python end and that works. However, that’s not so good for me so I tried subclassing Button in C# and debugging what is passed to the Click event when subscribing from Python and sure enough, it is a RoutedEventhandler (even without the @clr.crlmethod decorator). There must be a way to pass-in the method to C#!!

 

Background: this is an application to support simple GUI development in Python. The C# end handles creating and displaying the GUI components which results in very simple Python:

 

# works in IronPython

b = app.Button("Start", OnStartButton)

 

# can’t use OnStartButton as argument, have to add this in Python.NET :-(

b.Click += OnStartButton

 

By the way I’m using Python.Net with PyScope from my own build.

 

Steve

 

From: PythonDotNet [mailto:pythondotnet-bounces+steve.ward=oxinst.com@python.org] On Behalf Of Denis Akhiyarov
Sent: 20 June 2018 05:18
To: A list for users and developers of Python for .NET
Subject: -|EXT|- Re: [Python.NET] Cast PyObject to RoutedEventHandler