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:[email protected]] 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
Have you tried @clrmethod decorator?
https://github.com/pythonnet/pythonnet/blob/master/src/runtime/resources/clr.py#L54
https://github.com/pythonnet/pythonnet/blob/master/src/tests/test_clrmethod.py#L14
On Tue, Jun 19, 2018 at 10:37 AM, WARD Steve
<[email protected]<mailto:[email protected]>> wrote:
Can anyone tell me how to cast or Convert (or use a TryGet, or As whatever…), a
PyObject (a Python function), to a C# RoutedEventHandler?
The Python function:
def OnStartButton(sender,args):
#do stuff
pass
Thanks
Steve
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