How do I make sure no handlers are attached to an event?
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by Edward Tanguay
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Published on 2010-03-19T16:20:38Z
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2010/03/19
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I am adding an event handler like this:
theImage.MouseMove += new MouseEventHandler(theImage_MouseMove);
but in my application, this code gets run every time the page is shown, so I want to attach the event handler only once, but how can I tell if a handler has been set yet or not, something like this:
if(theImage.MouseMove == null) //error
theImage.MouseMove += new MouseEventHandler(theImage_MouseMove);
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