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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