[IronPython] WPF/IronPython event handlers question - multiple event handlers
fuzzyman at voidspace.org.uk
Mon Jun 7 23:56:01 CEST 2010
On 07/06/2010 21:26, Ken MacDonald wrote:
> I've got a whole stack of event handlers, assigned via the usual
> something like....
> my_button.Click += button_was_clicked
> As it turns out, the initialization for the thing that has all these
> handlers may need to be run several times, and it seems like I ended
> up with multiple copies of the same event handler, and
> "button_was_clicked()" now gets invoked multiple times for EACH time I
> click my_button. It seems to be solved by just skipping the handler
> assignment if I've already done it before, but it seems odd that the
> same EH would be assigned and fired twice.
It would seem odder to me if you added an event handler multiple times
and it *wasn't* called. :-)
The less programming languages read your mind and work out what they
*think* you meant the better. If you don't want an event handler
installed multiple times then don't add it multiple times...
> Is this really what I'm seeing? I can see a case for assigning
> multiple *different* EH's:
> my_button.Click += event_handler_1
> my_button.Click += event_handler_2
> but then this begs the question, is there a defined order in which the
> EH's will fire? I looked thru multiple python/IronPython books and
> googled, but came up empty on both questions..... Hopefully someone
> here understands these things better than I do....
> Users mailing list
> Users at lists.ironpython.com
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