System.Windows.Forms.Form_Load() calls Application.Exit and Form flashes?

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Joe Duchtel - 07 Mar 2008 15:29 GMT

Hello -

I have a GUI that is contained in a Class which Inherits
SystemWindows.Forms.Form. The Private Sub _Load() runs a few checks
on command arguments and in some cases calls Application.Exit after an
error message is output in a MsgBox().

What I am seeing, is that the GUI briefly appears and then
disappears ... like a quick flash. Is there anything I could to avoid
that? Is there a better way to exit out of the _Load() function?

Thanks,
Joe

Reply to this Message

Patrice - 07 Mar 2008 15:58 GMT

You could perhaps hide the window...

If possible my personal preference would be even to avoid doing this but
instead to check command line arguments before opening the window...

(for example in MyApplication.Startup that provides a e.cancel property to
cancel the application launch).

--
Patrice

> Hello -
>
[quoted text clipped - 9 lines]
> Thanks,
> Joe

Reply to this Message

Steve Gerrard - 07 Mar 2008 16:18 GMT

> Hello -
>
[quoted text clipped - 6 lines]
> disappears ... like a quick flash. Is there anything I could to avoid
> that? Is there a better way to exit out of the _Load() function?

I think it is generally not a good idea to exit out of a Load event. It is
confusing to Windows. :)

A better idea is to run your tests the first time the form is Activated:

Private Sub Form1_Activated( _
ByVal sender As Object, ByVal e As System.EventArgs) _
Handles MyBase.Activated

Static Checked As Boolean
If Not Checked Then
Checked = True
' do your checks here...
End If

End Sub

Reply to this Message

Joe Duchtel - 07 Mar 2008 19:00 GMT

> > Hello -
>
[quoted text clipped - 23 lines]
>
> End Sub

Hello -

I just tried this and it looks like the Activated event comes after
the Loaded. So I will get the Form visible. I guess that is not the
worst event. At least it will not flash anymore.

Thanks,
Joe

Reply to this Message

Thorsten Doerfler - 07 Mar 2008 18:17 GMT

Joe Duchtel schrieb:

> I have a GUI that is contained in a Class which Inherits
> SystemWindows.Forms.Form. The Private Sub _Load() runs a few checks
[quoted text clipped - 4 lines]
> disappears ... like a quick flash. Is there anything I could to avoid
> that? Is there a better way to exit out of the _Load() function?

Public Shared Sub Main()
If Checked() Then
Application.Run(New Form1)
Else
MsgBox("Failed!")
End If
End Sub

In Project => Properties select 'Sub Main' as Startup Object.

Thorsten Doerfler

Signature

Microsoft MVP Visual Basic

vb-hellfire visual basic faq | vb-hellfire - einfach anders
http://vb-faq.de/ | http://www.vb-hellfire.de/

Reply to this Message

System.Windows.Forms.Form_Load() calls Application.Exit and Form flashes?

Free Magazines