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On 07/06/2010 21:26, Ken MacDonald wrote:
<blockquote
cite="mid:AANLkTilNvBshq3rsf2eEZ2KVU66yBUSVbHDeaT7uL1Oa@mail.gmail.com"
type="cite">Hi,<br>
I've got a whole stack of event handlers, assigned via the usual
something like....<br>
<br>
my_button.Click += button_was_clicked<br>
<br>
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. </blockquote>
<br>
It would seem odder to me if you added an event handler multiple times
and it *wasn't* called. :-)<br>
<br>
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...<br>
<br>
Michael Foord<br>
<br>
<blockquote
cite="mid:AANLkTilNvBshq3rsf2eEZ2KVU66yBUSVbHDeaT7uL1Oa@mail.gmail.com"
type="cite">Is this really what I'm seeing? I can see a case for
assigning multiple <b>different</b> EH's:<br>
<br>
my_button.Click += event_handler_1<br>
my_button.Click += event_handler_2<br>
<br>
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....<br>
Ken<br>
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