How can I prevent window closing by showing a MessageBox? (Technology:WinForms with C#)
When the close event occurs I want the following code to be run:
private void addFile_FormClosing( object sender, FormClosingEventArgs e ) {
var closeMsg = MessageBox.Show( "Do you really want to close?", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Question );
if (closeMsg == DialogResult.Yes) {
//close addFile form
} else {
//ignore closing event
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
var window = MessageBox.Show(
"Close the window?",
"Are you sure?",
MessageBoxButtons.YesNo);
e.Cancel = (window == DialogResult.No);
}
Catch FormClosing event and set e.Cancel = true
private void AdminFrame_FormClosing(object sender, FormClosingEventArgs e)
{
var res = MessageBox.Show(this, "You really want to quit?", "Exit",
MessageBoxButtons.YesNo, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button2);
if (res != DialogResult.Yes)
{
e.Cancel = true;
return;
}
}
A special twist might be to always prevent just the user closing the form:
private void Frm_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = (e.CloseReason == CloseReason.UserClosing);
// disable user closing the form, but no one else
}
Within your OnFormClosing event you can show the dialog and if answer is false (to not show) then set the Cancel property of the EventArgs to true.
For prevent or block the form closing in particular situation you can use this strategy:
private void MyForm_FormClosing(object sender, FormClosingEventArgs e)
{
if (FLAG_CONDITION == true)
{
MessageBox.Show("To exit save the change!!");
e.Cancel = true;
}
}
Straight from MSDN:
private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
// Determine if text has changed in the textbox by comparing to original text.
if (textBox1.Text != strMyOriginalText)
{
// Display a MsgBox asking the user to save changes or abort.
if(MessageBox.Show("Do you want to save changes to your text?", "My Application",
MessageBoxButtons.YesNo) == DialogResult.Yes)
{
// Cancel the Closing event from closing the form.
e.Cancel = true;
// Call method to save file...
}
}
}
In your case you don't need to do anything to explicitly close the form. Unless you cancel it it will close automatically, so your code would be:
private void addFile_FormClosing( object sender, FormClosingEventArgs e ) {
var closeMsg = MessageBox.Show( "Do you really want to close?", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Question );
if (closeMsg == DialogResult.Yes) {
// do nothing
} else {
e.Cancel = true;
}
}
You can run any code you want when closing the form then, hide the form instead of closing it to prevent it from being disposed
yourFormName.FormClosing += (s, e) =>
{
// any code you want
yourFormName.Hide(); // this hides the form
e.Cancel = true; // this cancels the close event, you can put any boolean exprission
};
Related
I making a C# Windows Forms Application. I'm trying to have a message box popup when the "X" or Close Button is pressed to exist out of the application. This is what I have so far, and I don't know whats wrong with it. When I run the message box doesn't show up when I click on the Close Button. Any help would be appreciated. Thanks.
private void MainWindow_FormClosing(object sender, FormClosingEventArgs e)
{
if (this.DialogResult == DialogResult.Cancel)
{
if (MessageBox.Show("Do you want to save changes to the data?",
"MktAuthorizationData",
MessageBoxButtons.YesNo) == DialogResult.Yes)
{
e.Cancel = true;
// Do Something
}
}
}
You need to remove below condition
if (this.DialogResult == DialogResult.Cancel)
The below code should work
private void MainWindow_FormClosing(object sender, FormClosingEventArgs e)
{
if (MessageBox.Show("Do you want to save changes to the data?",
"MktAuthorizationData",
MessageBoxButtons.YesNo) == DialogResult.Yes)
{
e.Cancel = true;
// Do Something
}
}
In case you haven't subscribed to the event you need to do this by having this after InitializeComponent();
this.FormClosing += MainWindow_FormClosing;
You can add a Button Close event to close your window form with message box.
private void btnClose_Click(object sender, EventArgs e)
{
if (MessageBox.Show("Do you want to save changes to the data?",
"MktAuthorizationData",
MessageBoxButtons.YesNo) == DialogResult.Yes)
{
e.Cancel = true;
// Do Something
}
}
I wrote this code to handle the shutdown of the program/window when I press the Exit-Button:
private void MIExit_Click(object sender, RoutedEventArgs e)
{
var close = MessageBox.Show("Do you want to close the programm?", "", MessageBoxButton.YesNo);
if (close == MessageBoxResult.No)
return;
else
Application.Current.Shutdown();
}
The problem is I have to press "yes" twice for the application to close and I don`t understand why.
Thank you,
Filippo
ok sorry... I know why. I handled this for the "X" symbol top right on the window:
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
var close = MessageBox.Show("Do you want to close the programm?", "", MessageBoxButton.YesNo);
if (close == MessageBoxResult.No)
e.Cancel = true;
else
e.Cancel = false;
}
and obviously the messageBox appears two times...
There is no problem in your Code you posted.
Probably you have somewhere else a mistake.
I tried it like this:
Xaml:
<Button Click="MIExit_click">Exit</Button>
C#:
private void MIExit_click(object sender, RoutedEventArgs e)
{
if (MessageBox.Show("close?", "", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
Application.Current.Shutdown();
else return;
}
Works fine.
Are you possibly subscribing to the event twice? I would first handle the event so it doesn't bubble up, then add a simple flag so that your MessageBox does not get called twice.
private bool _shuttingDown;
private void MIExit_Click(object sender, RoutedEventArgs e)
{
e.Handled = true;
if (_shuttingDown) return;
_shuttingDown = true;
var close = MessageBox.Show("Do you want to close the programm?", "", MessageBoxButton.YesNo);
if (close == MessageBoxResult.No)
{
_shuttingDown = false;
return;
}
Application.Current.Shutdown();
}
Okay Problem As Follows:
I call up a custom form as follows:
SomeCustomForm _newForm = new SomeCustomForm();
_newForm.ShowDialog();
//**SOME OTHER CODE**
Now lets say we have some custom event (Mine is on a DataGridView DoubleClick):
private void dgvSomeGrid_DoubleClick(object sender, EventArgs e)
{
string name = dgvSomeGrid.CurrentRow.Cells[5].Value.ToString();
DialogResult = MessageBox.Show(name, "Select this Merkmal?", MessageBoxButtons.YesNo);
if (DialogResult == DialogResult.Yes)
{
_someID = Convert.ToInt32(dgvMSomeGrid.CurrentRow.Cells[0].Value.ToString());
this.Close();
}
else if (DialogResult == DialogResult.No)
{
return;
}
}
The dialog works fine in that the no and yes buttons behave as expected. My problem though is that irrespective of which button is clicked, the code jumps back to //**SOMEOTHERCODE. So in effect, the _newForm is just closed.
I obviously don't want this to happen as I am not done on the other form yet if the "No" button is clicked.
Any help?
EDIT:
My apologies - for the sake of clarity. The grid mentioned above is on the _newForm. And the dialog is called from the _newForm.
This closes unexpectedly.
don't use DialogResult property of form for comparison. Set it only on successful close
private void dgvSomeGrid_DoubleClick(object sender, EventArgs e)
{
string name = dgvSomeGrid.CurrentRow.Cells[5].Value.ToString();
var result = MessageBox.Show(name, "Select this Merkmal?", MessageBoxButtons.YesNo);
if (result == DialogResult.Yes)
{
_someID = Convert.ToInt32(dgvMSomeGrid.CurrentRow.Cells[0].Value.ToString());
this.DialogResult = DialogResult.Yes;
this.Close();
}
}
somewhere in code type static bool formCloseFlag = false;
Let's shorten your event handler code a bit:
private void dgvSomeGrid_DoubleClick(object sender, EventArgs e)
{
string name = dgvSomeGrid.CurrentRow.Cells[5].Value.ToString();
DialogResult = MessageBox.Show(name, "Select this Merkmal?", MessageBoxButtons.YesNo);
if (DialogResult == DialogResult.Yes)
{
_someID = Convert.ToInt32(dgvMSomeGrid.CurrentRow.Cells[0].Value.ToString());
formCloseFlag = true;
}
return;
}
then change your code like this :
SomeCustomForm _newForm = new SomeCustomForm();
_newForm.ShowDialog();
//**SOME OTHER CODE**
if(formCloseFlag) { _newForm.Close(); formCloseFlag = false; }
//**SOME OTHER CODE**
A workaround on this is to add a handler for the FormClosing event of your form, so you can cancel it there.
[edit]
After some experimenting, it seems that the bug is somewhat detectable by checking FormClosingEventArgs.CloseReason. This is normally "UserClosing" on normal close (even programmatically with calling this.Close()), but with this bug it's set to "None", a value I would assume is some kind of default that should normally never be used.
private void form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (e.CloseReason == CloseReason.None)
{
e.Cancel = true;
return;
}
// any other OnClose code you may wish to execute.
}
I had an problem with my application closing in c#. When I hit the close button it display twice or more times the message box. What should I do?
private void home_FormClosed(object sender, FormClosedEventArgs e)
{
DialogResult dialog = MessageBox.Show("Are you sure you want to really exit ? ",
"Exit",
MessageBoxButtons.YesNo,
MessageBoxIcon.Question);
if (dialog == DialogResult.Yes)
{
System.Windows.Forms.Application.Exit();
}
else if (dialog == DialogResult.No)
{
this.Show();
}
}
Use Form1_FormClosing event and also don't use Application.Exit() like this:
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
var x = MessageBox.Show("Are you sure you want to really exit ? ",
"Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (x == DialogResult.No)
{
e.Cancel = true;
}
else
{
e.Cancel = false;
}
}
Or like this:
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = MessageBox.Show("Are you sure you want to really exit ? ",
"Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No;
}
you should use the Form.FormClosing event instead of the FormClosed event. in the arguments, you find a field e.Cancel. by setting this to false, you keep your form open
You can avoid the multiple prompts by checking to see if Application.Exit() has been called already from within the FormClosing event:
void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (e.CloseReason != CloseReason.ApplicationExitCall)
{
DialogResult dialog = MessageBox.Show("Are you sure you want to really exit ? ", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (dialog == DialogResult.Yes)
{
System.Windows.Forms.Application.Exit();
}
else if (dialog == DialogResult.No)
{
e.Cancel = true;
}
}
}
Use the form closing event instead.
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
var confirmation = MessageBox.Show("Sure to close form", "Confirm", MessageBoxButtons.YesNo);
if (confirmation == System.Windows.Forms.DialogResult.No)
{
e.Cancel = true; //Even cancelled, form will not get closed now
}
}
How do I make the same functionality for form X (on the top extreme right) and close button. These 2 need to behave alike
This is what I have in btnClose_Click
private void btnClose_Click(object sender, EventArgs e)
{
DialogResult result;
int fileId = StaticClass.FileGlobal;
if (DataDirty)
{
string messageBoxText = "You have unsaved data. Do you want to save the changes and exit the form?";
MessageBoxButtons button = MessageBoxButtons.YesNo;
string caption = "Data Changed";
MessageBoxIcon icon = MessageBoxIcon.Question;
result = MessageBox.Show(messageBoxText, caption, button, icon);
if (result == DialogResult.No)
{
Program.fInput = new frmInputFiles(gtId, gName);
Program.fInput.Show();
this.Close();
}
if (result == DialogResult.Yes)
{
return;
}
}
else
{
Program.fInput = new frmInputFiles(gPlantId, gPlantName);
Program.fInput.Show();
this.Close();
}
}
Even on clicking the X to close the form,it should behave the same way as btnClose_Click
private void frmData_FormClosing(object sender, FormClosingEventArgs e)
{
btnClose_Click(sender,e);//this doesnt seem to be working.
}
It is going in a infinite loop. I understand y it is doing that.. btnClose_Click() has this.Close() which calls frmData_FormClosing.. which inturn calls btnclose..
Thank u
Just put this.Close() in the btnClose_Click() event. Then move all the rest of your logic (you'll need to edit it some) into the frmData_FormClosing() event and call e.Cancel = true; if you want to cancel closing the form (in your case, if there are unsaved changes and the user clicks Yes on the prompt.
Here's an example (I just cut and pasted in notepad, so fair warning):
private void btnClose_Click(object sender, EventArgs e)
{
this.Close();
}
private void frmData_FormClosing(object sender, FormClosingEventArgs e)
{
if (DataDirty)
{
if (MessageBox.Show("You have unsaved data. Do you want to save the changes and exit the form?",
"Data Changed", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
{
Program.fInput = new frmInputFiles(gtId, gName);
Program.fInput.Show();
}
else
e.Cancel = true;
}
else
{
Program.fInput = new frmInputFiles(gPlantId, gPlantName);
Program.fInput.Show();
}
}