Hi,
It appears displaying a messagebox in a validating event will cancel the
subsequent event. In the program below, button 2's click event doesn't fire
if you open a dialog box in button 1's validating event. Am I doing
something wrong here?
Thanks
Al
Imports system
Imports system.windows. forms
' Create a form, add two buttons and event handlers.
' Click on Button 2 to receive Button 1 validating
' event but not button 2's click event. MessageBox
' appears to kill the click event.
Module ValidateTest
Sub Main()
Dim frm As New Form()
Dim btn As New Button
btn.Text = "One"
btn.Parent = frm
AddHandler btn.Validating, AddressOf BtnValidating
btn = New Button
btn.Left = btn.Width + 3
btn.Text = "Two"
btn.Parent = frm
AddHandler btn.Click, AddressOf BtnClick
Application.Run (frm)
End Sub
Private Sub BtnValidating(B yVal sender As Object,
ByVal e As System.Componen tModel.CancelEv entArgs)
MessageBox.Show ("BtnValidat ing event")
End Sub
Private Sub BtnClick(ByVal sender As Object, ByVal e As
System.EventArg s)
MessageBox.Show ("BtnClick event")
End Sub
End Module
16  5510 
Al Santino wrote:
It appears displaying a messagebox in a validating event will cancel the
subsequent event. In the program below, button 2's click event doesn't fire
if you open a dialog box in button 1's validating event. Am I doing
something wrong here?
I'm not sure I understand the problem. Why would the second button's
click event be fired when the Validating event for button 1 fires?
>
<code snipped>
"Chris Dunaway" <du******@gmail .comwrote in message
news:11******** **************@ n13g2000cwa.goo glegroups.com.. .
Al Santino wrote:
>It appears displaying a messagebox in a validating event will cancel the
subsequent event. In the program below, button 2's click event doesn't
fire
if you open a dialog box in button 1's validating event. Am I doing
something wrong here?
I'm not sure I understand the problem. Why would the second button's
click event be fired when the Validating event for button 1 fires?
>>
<code snipped>
Well, I thought it would fire because that was how it's supposed to work.
If you remove the MessageBox call in the validation handler the click event
fires for button 2. My understanding is that the second button's event
should fire unless you set the cancel arg to true in the validation event
handler.
"Chris Dunaway" <du******@gmail .comwrote in message
news:11******** **************@ n13g2000cwa.goo glegroups.com.. .
Al Santino wrote:
>It appears displaying a messagebox in a validating event will cancel the
subsequent event. In the program below, button 2's click event doesn't
fire
if you open a dialog box in button 1's validating event. Am I doing
something wrong here?
I'm not sure I understand the problem. Why would the second button's
click event be fired when the Validating event for button 1 fires?
>>
<code snipped>
Actually I'm not suggesting it should fire WHEN the validating event fires
but AFTER it fires since the validating event didn't set the cancel argument
to true.
Al Santino wrote:
Actually I'm not suggesting it should fire WHEN the validating event fires
but AFTER it fires since the validating event didn't set the cancel argument
to true.
Perhaps I misunderstood. Are you saying that after the validating
event fires, then the click event for the button doesn't fire, even if
you click the button?
"Chris Dunaway" <du******@gmail .comwrote in message
news:11******** **************@ n13g2000cwa.goo glegroups.com.. .
Al Santino wrote:
>Actually I'm not suggesting it should fire WHEN the validating event
fires
but AFTER it fires since the validating event didn't set the cancel
argument
to true.
Perhaps I misunderstood. Are you saying that after the validating
event fires, then the click event for the button doesn't fire, even if
you click the button?
Yes. If you run the program, button 1 will start with the focus. If you
click on button 2, the button 1 validating event will fire and the program
will display the messagebox. After you close the message box, button 2 will
get the focus but its click event will not fire.
"Chris Dunaway" <du******@gmail .comwrote in message
news:11******** **************@ n13g2000cwa.goo glegroups.com.. .
Al Santino wrote:
>Actually I'm not suggesting it should fire WHEN the validating event
fires
but AFTER it fires since the validating event didn't set the cancel
argument
to true.
Perhaps I misunderstood. Are you saying that after the validating
event fires, then the click event for the button doesn't fire, even if
you click the button?
Or better put:
Yes. If you run the program, button 1 will start with the focus. If you
click on button 2, the button 1 validating event will fire and the program
will display the messagebox. After you close the message box, button 2 will
get the focus but its click event will not _have fired_.
Hello, Al,
I have tried your code (VB.Net 2003) and can confirm that I see the same
(inappropriate) behaviour.
It sure looks like a problem to me. I hope someone can provide an
explanation and/or workaround.
Cheers,
Randy
Al Santino wrote:
Hi,
It appears displaying a messagebox in a validating event will cancel the
subsequent event. In the program below, button 2's click event doesn't fire
if you open a dialog box in button 1's validating event. Am I doing
something wrong here?
Thanks
Al
Imports system
Imports system.windows. forms
' Create a form, add two buttons and event handlers.
' Click on Button 2 to receive Button 1 validating
' event but not button 2's click event. MessageBox
' appears to kill the click event.
Module ValidateTest
Sub Main()
Dim frm As New Form()
Dim btn As New Button
btn.Text = "One"
btn.Parent = frm
AddHandler btn.Validating, AddressOf BtnValidating
btn = New Button
btn.Left = btn.Width + 3
btn.Text = "Two"
btn.Parent = frm
AddHandler btn.Click, AddressOf BtnClick
Application.Run (frm)
End Sub
Private Sub BtnValidating(B yVal sender As Object,
ByVal e As System.Componen tModel.CancelEv entArgs)
MessageBox.Show ("BtnValidat ing event")
End Sub
Private Sub BtnClick(ByVal sender As Object, ByVal e As
System.EventArg s)
MessageBox.Show ("BtnClick event")
End Sub
End Module
Hi Randy,
Thanks for taking the time to try it. I'll keep my fingers crossed about
the workaround.
Al
"R. MacDonald" <sc****@NO-SP-AMcips.cawrote in message
news:44******** **************@ news.wanadoo.nl ...
Hello, Al,
I have tried your code (VB.Net 2003) and can confirm that I see the same
(inappropriate) behaviour.
It sure looks like a problem to me. I hope someone can provide an
explanation and/or workaround.
Cheers,
Randy
Al Santino wrote:
>Hi,
It appears displaying a messagebox in a validating event will cancel the
subsequent event. In the program below, button 2's click event doesn't
fire if you open a dialog box in button 1's validating event. Am I doing
something wrong here?
Thanks
Al
Imports system
Imports system.windows. forms
' Create a form, add two buttons and event handlers.
' Click on Button 2 to receive Button 1 validating
' event but not button 2's click event. MessageBox
' appears to kill the click event.
Module ValidateTest
Sub Main()
Dim frm As New Form()
Dim btn As New Button
btn.Text = "One"
btn.Parent = frm
AddHandler btn.Validating, AddressOf BtnValidating
btn = New Button
btn.Left = btn.Width + 3
btn.Text = "Two"
btn.Parent = frm
AddHandler btn.Click, AddressOf BtnClick
Application.Run (frm)
End Sub
Private Sub BtnValidating(B yVal sender As Object,
ByVal e As System.Componen tModel.CancelEv entArgs)
MessageBox.Show ("BtnValidat ing event")
End Sub
Private Sub BtnClick(ByVal sender As Object, ByVal e As
System.EventAr gs)
MessageBox.Show ("BtnClick event")
End Sub
End Module
Al Santino wrote:
"Chris Dunaway" <du******@gmail .comwrote in message
news:11******** **************@ n13g2000cwa.goo glegroups.com.. .
>>Al Santino wrote:
>>>Actually I'm not suggesting it should fire WHEN the validating event
fires
but AFTER it fires since the validating event didn't set the cancel
argument
to true.
Perhaps I misunderstood. Are you saying that after the validating
event fires, then the click event for the button doesn't fire, even if
you click the button?
Or better put:
Yes. If you run the program, button 1 will start with the focus. If you
click on button 2, the button 1 validating event will fire and the program
will display the messagebox. After you close the message box, button 2 will
get the focus but its click event will not _have fired_.
From the code posted I don't see why button2's click event would be
triggered at all. The click event will not fire simply because a button
get's the focus.
--
Rinze van Huizen
C-Services Holland b.v This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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