"Handles" Question

[johnb41]

This question is regarding the "Handles" part of a routine, for
example:

Handles Button1.Click

On Form2 (a User Control) I have a button. Here's it's code:

Public Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
'...
End Sub

Ok, now on Form1, I have a Menu. One of the menu items needs to act
like Button1 was clicked.

I would like to add to the Handles section by adding:
Handles Button1.Click, Menuitem1.Click

This would work if the button and menuitem were on the same form. But
they are on different forms. I get an error saying "Handles clause
requires a WithEvents variable". How do I go about this?

Thanks for your help!

John

[Herfried K. Wagner [MVP]]

"johnb41" <or****@informa tik.com> schrieb:

I would like to add to the Handles section by adding:
Handles Button1.Click, Menuitem1.Click

This would work if the button and menuitem were on the same form. But
they are on different forms. I get an error saying "Handles clause
requires a WithEvents variable". How do I go about this?

Take a look at the 'AddHandler' statement in the documentation. You can use
this statement to add a handler to an object's event at runtime.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Cor Ligthert]

John,

There are plenty of methods to force a click event of a button.
Some of them

button1.perform click
ButtonClick(not hing, nothing)

Or to create an extra sub and start that from your both events
(probably for the documentation the best way)

I hope this helps,

Cor>

[Herfried K. Wagner [MVP]]

"Cor Ligthert" <no************ @planet.nl> schrieb:

ButtonClick(not hing, nothing)

As always: /Never/ do that!

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[johnb41]

Hmmm... I was just going to thank Cor for that easy fix. It worked for
me with no problems.

Why /Never/ do that?

If you convince me, i'll look into the Addhandler suggestion which
looks complicated at first glance! :)

John

[Armin Zingler]

"johnb41" <or****@informa tik.com> schrieb

Hmmm... I was just going to thank Cor for that easy fix. It worked
for me with no problems.

Why /Never/ do that?
No button has been clicked. There is no sender. There are no event args.
If you convince me, i'll look into the Addhandler suggestion which
looks complicated at first glance! :)

Use Addhandler to tell which procedure is to be called when the event is
raised. As Button1_Click is to be called, use

addhandler yourmenuitem.cl ick, addressof Form2.Button_Cl ick.

I'd then name it differently. Even better, use Cor's 3rd suggestion.

Armin

[Cor Ligthert]

John,

Hmmm... I was just going to thank Cor for that easy fix. It worked for
me with no problems.

Why /Never/ do that?

If you convince me, i'll look into the Addhandler suggestion which
looks complicated at first glance! :)

He never could convince me, for me are his arguments about this synthytical
sugar.

However maybe has Herfried now new arguments.

:-)

Cor

[Herfried K. Wagner [MVP]]

"johnb41" <or****@informa tik.com> schrieb:

Hmmm... I was just going to thank Cor for that easy fix. It worked for
me with no problems.

Why /Never/ do that?

If you convince me, i'll look into the Addhandler suggestion which
looks complicated at first glance! :)

Maybe you'll extend your code to use the values passed to the handler's
'sender' and 'e' parameter, and calling the handler directly without passing
the right values to it will lead to 'NullReferenceE xception's when
attempting to access the parameter values.

I suggest to either call the button's 'PerformClick' method (which will only
work if the button is enabled and visible), call the handler using
'Bla(Me.Button1 , EventArgs.Empty )' or put the code from the handler to a
separate procedure and call this procedure from within the handler and any
other place.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Herfried K. Wagner [MVP]]

"Cor Ligthert" <no************ @planet.nl> schrieb:

Hmmm... I was just going to thank Cor for that easy fix. It worked for
me with no problems.

Why /Never/ do that?

If you convince me, i'll look into the Addhandler suggestion which
looks complicated at first glance! :)

He never could convince me, for me are his arguments about this
synthytical sugar.

My concern is with passing 'Nothing' to the event handler's parameters,
which may lead to problems over time.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[johnb41]

Thanks everyone for all your help!

I considered the PerformClick method, but it is not available for some
of my controls (for example, not available for LinkLabel).

I just couldn't figure out the AddHandler method (i.e. where in my code
to put it)

I think i'll go with making a regular sub routine, and having all my
code point to it. Easy for my brain to comprehend! :)

Thanks everyone!!

John