[IronPython] IP2b5 - error in calling bound method from C#?

[Dino Viehland]

FYI this is the same as bug #18345 - http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=18345

We'll fix this for the RC.

From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Ronnie Maor
Sent: Monday, September 22, 2008 6:39 AM
To: Discussion of IronPython
Subject: Re: [IronPython] IP2b5 - error in calling bound method from C#?

2nd attempt at defining the problem:
"problem assigning bound method to delegate?"
that's my last try. now someone who actually has a clue needs to look at it :-)
On Mon, Sep 22, 2008 at 3:29 PM, Ronnie Maor <ronnie.maor at gmail.com<mailto:ronnie.maor at gmail.com>> wrote:
I think this is a bug and not some silly mistake on my part...
not sure exactly which flows this effects, but here is a small repro:

import System.Threading

def cb(state):
    print "CB CALLED"

class Timer(object):
    def __init__(self,delay,interval):
        def _inner_cb(state):
            print "INNER CALLED"
            self._callback(None)
        f = self._callback # this is the problematic variant
        #f = cb
        #f = _inner_cb

        self.timer = System.Threading.Timer(f,None,delay,interval)

    def _callback(self,state): # state parameter is required as part of TimerCallback signature. ignore it.
        print "CALLBACK CALLED"

t = Timer(1000,0)
print "Sleeping..."
System.Threading.Thread.CurrentThread.Join(2000)
print "Woke up"

------------------ (end code)

C:\IronPython\2.0\IronPython-2.0B5>ipy \data\trunk\src\Itst.Backend\tmp.py
Traceback (most recent call last):
  File "\data\trunk\src\Itst.Backend\tmp.py", line 20, in \data\trunk\src\Itst.Backend\tmp.py
  File "\data\trunk\src\Itst.Backend\tmp.py", line 15, in __init__
TypeError: Value cannot be null.
Parameter name: context

The code works when you change f to one of the other variants (cb or _inner_cb).
For now I'm going to use _inner_cb variant as a workaround so I can continue porting my code and map other issues.

one note if/when comparing with IPy 1.1. The overload resolution was not as good there, so you need to change the call to Timer to:
        Timer_ctor = System.Threading.Timer.__new__.Overloads[(System.Threading.TimerCallback,object,int,int)]
        self.timer = Timer_ctor(System.Threading.Timer,f,None,delay,interval)

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