about delegate

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about delegate

Postby qf » Sat, 25 Dec 2004 06:08:54 GMT

Hi, Everyone, in the addhandler, event and addressof, how 
they are related to the delegate. Why the addhandler need 
delegate. For example, addHandler a, addressof b, the a 
is delegate? b is an instance delegate of a. How do they 
work. I confuse
Thank you!

about delegate

Postby yeah » Sat, 25 Dec 2004 06:19:53 GMT

Hi, everyone, I confuse about delegate, in the 
addhandler, event, what are the functions of a delegate. 
for exmaple, Addhandler a, addressof b, the a is a event 
which means delegate, b is the instance of a delegate? 
why do we need delegate involved in the addHandler.
Thanks!

RE: about delegate

Postby U2Vhbg » Wed, 29 Dec 2004 08:01:03 GMT

Ill take a stab at this..

the adhandler a, adressof b is basically telling the application that 
anytime it sees a actually use b. 

Classic example is that you have a program with a ton of click events 
already in it but you want to add something neat to all click events without 
really changing the base click event. Delegates give the same event, a new 
address.

While Override actually adds or changes functions within the actual event.

Now...I am still learning this myself so if any of it sounds odd, dont take 
my word for it. I have read several books perparing for this I am must say 
that "The visual basic .net programming language" book part of the .net 
developement series (cant see author from here) ito be a god send





about delegate

Postby Xavier » Thu, 30 Dec 2004 01:15:06 GMT

Hi:

Addhandler Object.Event, addressof Sub

The addressof Sub Part is working as a delegate that is 
pointing to a function
The most important thing about Delegates is that they can 
point to any Sub with identical Signature, 
in this case the signature is the event signature.
By the way it's not exactly that the addhandler needs an 
explicit delegate because when you are using addressof you 
are using an implicit delegate.

For instance when you use

Addhandler x.click, addressof MyEventController

X can be an instance of a Button
Click is the event you are connecting to
MyEventController is the Sub who will be receive the 
program flow when the event click from the button x will 
be raised

MyEventController must be a Sub with (sender as object , e 
as eventargs) as a signature this is the restriction that 
works as a delegate






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