[IronPython] Can't get asynchronous delegates to work

Dino Viehland dinov at microsoft.com
Thu Sep 11 08:54:31 PDT 2008

You're hitting a CLR bug.  Here's an explanation of the issue: http://lists.ironpython.com/pipermail/users-ironpython.com/2008-May/007073.html and here's a potential work around: http://lists.ironpython.com/pipermail/users-ironpython.com/2008-May/007078.html

It looks like they're still working on fixing it.

From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Knic Knic
Sent: Thursday, September 11, 2008 2:32 AM
To: users at lists.ironpython.com
Subject: [IronPython] Can't get asynchronous delegates to work

I am trying to get asynchronous delegates to work in 1.1.2 and 2.0 beta3, both fail for me, here is what I am trying to do

from IronPython.Runtime.Calls import CallTarget0

def printHi():
 print 'hi'

delegate = CallTarget0(printHi)
async_result = delegate.BeginInvoke(None, None)

Here is what I get:

Traceback (most recent call last):
  File , line 0, in <stdin>##22
  File , line 0, in EndInvoke##23
SystemError: Object reference not set to an instance of an object.
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