In my mdiMain, I have this code set.
Private Sub mdiMain_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
e.Cancel = IIf(MsgBox("Closing this window will log you out. Are you sure?", MsgBoxStyle.YesNo, "Log out?") = MsgBoxResult.Yes, False, True)
End Sub
My reason for this is to catch all triggers of closing the form. Either if the user clicks the log out button, or they press the x button on the top right corner of the window, or even if they press Alt-F4. Under the FormClosed of the same MDI, there is a set of instructions after it has been confirmed to log out. My problem is I also have a process where in the user is forcibly logged out of the program. Since the user is "forced" to log out, the confirmation dialog should be bypassed. But I'm not sure how to bypass the FormClosing event, and skip directly to the FormClosed.
So far I've only come up with one way and that is to set a boolean trigger. Something like
Private Sub mdiMain_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
If ForceLogOut = True Then Exit Sub
e.Cancel = IIf(MsgBox("Closing this window will log you out. Are you sure?", MsgBoxStyle.YesNo, "Log out?") = MsgBoxResult.Yes, False, True)
End Sub
But for knowledge's sake, I would still like to hear from other people about other ways for this.
You can check the FormClosingEventArgs.CloseReason to see why the form is closing i.e. what event caused the form to close and set the cancel flag accordingly.
Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
Select Case e.CloseReason
Case CloseReason.TaskManagerClosing
e.Cancel = False
Case CloseReason.MdiFormClosing
e.Cancel = If(MsgBox("Closing this window will log you out. Are you sure?", MsgBoxStyle.YesNo, "Log out?") = MsgBoxResult.Yes, False, True)
'etc
End Select
End Sub
Note: You should use the IfOperator not the IIf function in VB.NET as it is type safe. You should also switch option strict on (which incidentally will not allow you to use IIf for this very reason)
Related
So I would like to perform a confirmation before i close the application or logout the application by clicking the logout button or just click to close the application. If i directly close the application then the message box just appear once. However when i use the logout button then the message box appear twice.
So the coding is basically look like this:
Private Sub btnLogOut_Click(sender As Object, e As EventArgs) Handles btnLogOut.Click
If logOut() Then
Me.Dispose()
frmLogIn.Show()
End If
End Sub
Private Sub frmHome_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
If logOut() Then
Me.Dispose()
frmLogIn.Show()
Else
e.Cancel = True
End If
End Sub
Public Function logOut() As Boolean
Dim respond = MessageBox.Show("Are you sure you want to log out?", "Log Out", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
If respond = DialogResult.Yes Then
blnResult = True
Else
blnResult = False
End If
logOut = blnResult
End Function
So anyone could help?
In your logout button event click
If logOut() Then //first line
Me.Dispose()//second line
frmLogIn.Show()//third line
End If//fourth line
in your second line which is Me.Dispose, you disposing the form, in other term you CLOSING it. So that, Your form_close event will be trigger because you dispose your form. That's why the message box pop up twice.
I have a form that i close using End several times in my code. I want to do a command to save settings when I do this called VarsToIni() which takes some public variables and saves them in an INI file. I have tried putting it in the main window's FormClosing (which stays open throughout) and this only works when you close from pressing the X button not from my End statement.
Add a new Sub and replace calls to End with calls to your new Sub:
Sub EndMe()
VarsToIni()
Application.Exit()
End Sub
Edit:
As Dan points out, End() is a bad way to close the application, Application.Exit() is preferred.
Consider using Application.Exit() instead of End. This allows FormClosing to be called no matter what (and you can handle it based on how it is being closed).
Private Sub frmMain_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
Select Case e.CloseReason
Case CloseReason.ApplicationExitCall
' This is the result of Application.Exit()
e.Cancel = False
Case CloseReason.UserClosing
' This is the result of clicking the red X
Select Case MessageBox.Show("Are you sure you wish to exit?", "Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
Case DialogResult.Yes
e.Cancel = False
Case DialogResult.No
e.Cancel = True
End Select
Case Else
e.Cancel = False
End Select
If Not e.Cancel Then
VarsToIni()
End If
End Sub
I am quite confused by your question, nonetheless:
This will close all your forms
For each x as Form in My.Application.OpenForms
'You can then put your VarsToIni() here
x.Close()
Next
Note: Add this to your import
Imports System.Windows.Forms
I am making an server control application ( simple with some buttons to start/stop the server )
And when the user wants to close the application there will be prompted an confirm box.
Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
Dim response As Integer
response = MsgBox("Are you sure you want to stop the server", vbYesNo, "Stop Server ?")
If response = vbYes Then
Shell("cscript ""stop.vbs""", 1)
Close()
Else
e.Cancel = True
End If
End Sub
That is the code I have now.
But when I start the application and close it with the X button or with "Close Window" I will be prompted with the question until I click on no, then it will close.
It's a loop and it stops when you first click on yes then on no.
Can someone help me with solving this ?
Just remove the Close() call, since the Form is already closing. No need to do that.
I have a single windows form application that is running in system tray icon.If the user press X button of the windows form a messagebox is displayed with Yes and No ( Yes ->close the form---No->keep the form running in system tray icon).
I was thinking to prevent the scenario when the user open another instance of the application when there is already an instance running so i have used this code :
If Process.GetProcessesByName(Process.GetCurrentProcess.ProcessName).Length> 1 Then
MessageBox.Show("Another instance is running", "Error Window", MessageBoxButtons.OK,
MessageBoxIcon.Exclamation)
Application.Exit()
End If
The problem is that when i want to test this the message is displayed but after i press ok, a new messagebox appears (that one from Private Sub Form_FormClosing ).If i choose NO i will have to instance running!
I have read that Application.Exit fires the Form_FormClosing event.
Is there any possibility to cancel the triggering of the Form_FormClosing event,or am i doing something wrong?
'this is the formclosing procedure
Private Sub Form_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
Try
Dim response As MsgBoxResult
response = MsgBox("Are you sure you want to exit", CType(MsgBoxStyle.Question + MsgBoxStyle.YesNo, MsgBoxStyle), "Confirm")
'If the user press Yes the application wil close
'because the application remains in taskmanager after closing i decide to kill the current process
If response = MsgBoxResult.Yes Then
Process.GetCurrentProcess().Kill()
ElseIf response = MsgBoxResult.No Then
e.Cancel = True
Me.WindowState = FormWindowState.Minimized
Me.Hide()
NotifyIcon1.Visible = True
End If
PS: I am not a programmer so please don't be to harsh with me:)
You don't need to Kill the current process or use the End Statement. If you have to use these then there is something amiss with your application.
When you want to end your application use Me.Close. This will fire the FormClosing event:
Private Sub Form1_FormClosing(sender As Object, e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
Select Case MessageBox.Show("Are you sure you want to exit?", "Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
Case Windows.Forms.DialogResult.Yes
'nothing to do here the form is already closing
Case Windows.Forms.DialogResult.No
e.Cancel = True 'cancel the form closing event
'minimize to tray/hide etc here
End Select
End Sub
To stop more than one copy of your application from running use the option to Make Single Instance Application
In the situation where you are just starting your application and are testing for previous instances I have used the VB End Statement to terminate the application.
The End statement stops code execution abruptly, and does not invoke
the Dispose or Finalize method, or any other Visual Basic code. Object
references held by other programs are invalidated. If an End statement
is encountered within a Try or Catch block, control does not pass to
the corresponding Finally block.
If Process.GetProcessesByName(Process.GetCurrentProcess.ProcessName).Length> 1 Then
MessageBox.Show("Another instance is running", "Error Window", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
End
End If
Private Sub main_master_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
If e.CloseReason = CloseReason.UserClosing Then
'Put you desired Code inside this!
Msgbox("Application Closing from Taskbar")
End If
End Sub
It will Close the exe from Taskbar or kill Process. If user Close the
Application from taskbar.
CloseReason.UserClosing
event will close the application if it is closed by User from
Taskber
I'm venturing into making my VB.NET application a little better to use by making some of the forms modeless.
I think I've figured out how to use dlg.Show() and dlg.Hide() instead of calling dlg.ShowDialog(). I have an instance of my modeless dialog in my main application form:
Public theModelessDialog As New dlgModeless
To fire up the modeless dialog I call
theModelessDialog.Show()
and within the OK and Cancel button handlers in dlgModeless I have
Private Sub OK_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK_Button.Click
Me.DialogResult = System.Windows.Forms.DialogResult.OK
Me.Hide()
End Sub
Private Sub Cancel_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Cancel_Button.Click
Me.DialogResult = System.Windows.Forms.DialogResult.Cancel
Me.Hide()
End Sub
and that seems to work fine.
The "X" button in the upper right is getting me, though. When I close the form with that button, then try to reopen the form, I get
ObjectDisposedException was unhandled. Cannot access a disposed object.
I feel like I'm most of the way there but I can't figure out how to do either of the following:
Hide that "X" button
Catch the event so I don't dispose of the object (just treat it like I hit Cancel)
Any ideas?
The class of this dialog is System.Windows.Forms.Form.
Catch the FormClosing event and, if the reason is UserClosing, set Cancel on the event to true.
Something like the following:
Private Sub Form1_FormClosing(sender as Object, e as FormClosingEventArgs) _
Handles Form1.FormClosing
if e.CloseReason = CloseReason.UserClosing then
e.Cancel = true
Me.Hide()
end if
End Sub
Use Me.Close() to hide the form. To open it, use the following snippet:
If theModelessDialog.IsDisposed Then
theModelessDialog = New dlgModeless
End If
dlgModeless.Show()
If this is saving data, then you'll need to figure some way of storing it (perhaps in a static variable/s in the form). This is the proper way to do what you are trying to achieve though.
You'll also have to forgive me if my VB is off, it's been a while.
the formclosing event allows me to do a managed exit of the form so I have included a question to confirm to exit. I also have a form flag bterminate to force the cancel where i want it to and therefore not ask the question. Thanks your suggestion helped me as well :)
Dim msgboxresponse As MsgBoxResult
If e.CloseReason = CloseReason.UserClosing Then
If Not Me.bTerminate Then
msgboxresponse = MsgBox("Are you sure you want to cancel adding?", _
MsgBoxStyle.Question + MsgBoxStyle.YesNo, Me.Text)
If msgboxresponse <> MsgBoxResult.Yes Then
e.Cancel = True
Return
End If
End If
End If
#John was Hiding the form in his code and the answers above provide a solution to that case. Often, though, you are not planning to use the form again, so you really do want the form to be Disposed. All Close related activities will be in one place if you Handle the FormClosing event using Me.FormClosing by adding it to anyCancel/Close/Exit code that you already have. e.g. in #John's case:
Private Sub Cancel_Button_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles Cancel_Button.Click, Me.FormClosing
....More code
Me.Dispose
End Sub
Note the use of the Me.Dispose instead of any existing Me.Close. If you leave the Me.Close you'll create an infinite loop. See this for the subtle differences between Close and Dispose.
Agree with handling the FormClosing event. Or change the properties on the form to hide the system X control.
I've tried everything and it didn't work
if you just want to close, without showing an messagebox, you will just need:
Private Sub FORM1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
>e.Cancel = False
>FORM2.Show() (if you want to show another form)
End Sub
Hope this helps you...!