I have custom dialog box with a button and a link_label which i use as a button.
When the user clicks the label i want to open a certain folder at window explorer and keep the dialog open. I know which button the user clicks by determining what Dialog result to return.
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
this.DialogResult = DialogResult.No;
}
private void simpleButton1_Click(object sender, EventArgs e)
{
this.DialogResult = DialogResult.OK;
}
At another class i have a method which returns a bool value according to the dialogResult:
DialogResult res = dig.ShowDialog();
return res == DialogResult.No;
Then if this methods return true i need to open the win explorer and keep the dialog open until the button is clicked.
the problem is when im tring to prevent the dialog to closing with FormClosing event of MyDialog form, the explorer is not opened. And if i am not using FormClosing the explorer opens but the dialog is closed.
private void MyDialog_FormClosing(object sender, FormClosingEventArgs e)
{
if (this.DialogResult == DialogResult.No)
{
e.Cancel = true;
}
}
EDIT: I cant use the Linkclicked event of the form because i want this dialog to be reusable and handle the result each time. (open different paths depends on where i use the dialog)
The reason why explorer is not opened is that when you reject the form close, the parent code doesnt continue to open explorer,
What you want to achieve is a bit unclear to me, but the way you do it is not possible, as a suggestion why not open the FolderBrowserDialog from inisde MyDialog based on label click and closing MyDialog on button click, rather than having the parent handle the decision.
I have a separate windows form for user to select background music and it will always stay there unless the application is closed. I prevented the user from closing the music form by using the code:
private void Music_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = true;
}
and in my main Program.cs i run a page called login like so:
Application.Run(new Login());
I also have a FormClosed event in all my forms that closes the whole program after pressing the cross
private void Login_FormClosed(object sender, FormClosedEventArgs e)
{
Application.Exit();
}
However, after i add the code that the user is not able to close the music form, my application is only able to exit by pressing the cross when it is in the login page, which is the start of the program ran by the main page (the application used to be able to exit in all of my forms by pressing the cross)
I want to know if there is any way for me to properly exit my application or a way to make user not able to close the music form without affecting my other form's closing. Thank you
The code inside Music_FormClosing is preventing your application from exiting. To get the desired behavior (prevent the user closing the music form), you can utilize the FormClosingEventArgs CloseReason property:
private void Music_FormClosing(object sender, FormClosingEventArgs e)
{
if (e.CloseReason == CloseReason.UserClosing)
e.Cancel = true;
}
I want if user click the close button to close a WinForm, it will perform some work such as showing MessageBox message:
void frmMemberSearch_FormClosing(object sender, FormClosingEventArgs e)
{
MessageBox.Show("close message");
}
the about code does not work. Does anyone know what may be the problem?
just double click form closing event on Form Properties Tab.
This is probably going to be a standard question. I have read lots of articles on this but none point out the issue i am having specifically.
I am developing a WinForm and have a "Main Menu" form that is loaded on startup. Within this main are several buttons which open up individual modules (other forms) of the program.
I can open up the form no problem and can close it and re-show the main form no problem. The problem lies when a user hits the (X) in the control box, the application doesnt exit because the main form is still there, but hidden. I know that i could put an application.exit() in the close event of the form. However, then if i have a button that closes the form and wants to unhide the main form, the application will close due to the formclosing event.
Can someone help me understand this principle. I dont think it should be as hard as it seems to me and i dont really want to use Panels.
Thanks in advance.
-Joseph
the following code solved the issue based on the answer provided below
private void btnHome_Click(object sender, EventArgs e)
{
Form f1 = Application.OpenForms[0];
f1.Visible=true;
this.Close();
}
private void frmCostControlMain_FormClosed(object sender, FormClosedEventArgs e)
{
Form f = Application.OpenForms[0]; // The main form
if (f.Visible==true)
{
f.BringToFront();
}
else
{
Application.Exit();
}
}
You can check the Application.OpenForms and see whether some non-hidden forms other than the current form are around. If you only want to check the main form, you can check Application.OpenForms[0]. Since it was opened first, it will always be at index 0. From memory:
Form_Closed(object sender, EventArgs e)
{
Form f = Application.OpenForms[0]; // The main form
if (f.Visible) {
f.BringToFront();
} else {
Application.Exit();
}
}
When the close button is clicked you would first unhide the main form and then close the current form.
I still don't understand your question, but I guess you could use the
Application.Exit().
You should then check the arguments of your FormClosed event.
The Close reason is as follows:
Click on [X]:
CloseReason = UserClosing
Application Exit:
CloseReason = ApplicationExitCall
You could then handle it properly
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
if (e.CloseReason == CloseReason.ApplicationExitCall)
{
//Application.Exit();
}
else if (e.CloseReason == CloseReason.UserClosing)
{
//[X] was pressed
}
else
{
//Many other reasons
}
}
I guess there is a much cleaner way of handling your problem. If you provide a bit more details, I think someone would be able to help you along.
What is the best way to disable Alt + F4 in a c# win form to prevent the user from closing the form?
I am using a form as a popup dialog to display a progress bar and I do not want the user to be able to close it.
This does the job:
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = true;
}
Edit: In response to pix0rs concern - yes you are correct that you will not be able to programatically close the app. However, you can simply remove the event handler for the form_closing event before closing the form:
this.FormClosing -= new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
this.Close();
If you look at the value of FormClosingEventArgs e.CloseReason, it will tell you why the form is being closed. You can then decide what to do, the possible values are:
Member name - Description
None - The cause of the closure was not defined or could not be determined.
WindowsShutDown - The operating system is closing all applications before shutting down.
MdiFormClosing - The parent form of this multiple document interface (MDI) form is closing.
UserClosing - The user is closing the form through the user interface (UI), for example by clicking the Close button on the form window, selecting Close from the window's control menu, or pressing ALT+F4.
TaskManagerClosing - The Microsoft Windows Task Manager is closing the application.
FormOwnerClosing - The owner form is closing.
ApplicationExitCall - The Exit method of the Application class was invoked.
I believe this is the right way to do it:
protected override void OnFormClosing(FormClosingEventArgs e)
{
switch (e.CloseReason)
{
case CloseReason.UserClosing:
e.Cancel = true;
break;
}
base.OnFormClosing(e);
}
Note that it is considered bad form for an application to completely prevent itself from closing. You should check the event arguments for the Closing event to determine how and why your application was asked to close. If it is because of a Windows shutdown, you should not prevent the close from happening.
You could handle the FormClosing event and set FormClosingEventArgs.Cancel to true.
I am using a form as a popup dialog to display a progress bar and I do not want the user to be able to close it.
If the user is determined to close your app (and knowledgeable) enough to press alt+f4, they'll most likely also be knowledgeable enough to run task manager and kill your application instead.
At least with alt+f4 your app can do a graceful shutdown, rather than just making people kill it. From experience, people killing your app means corrupt config files, broken databases, half-finished tasks that you can't resume, and many other painful things.
At least prompt them with 'are you sure' rather than flat out preventing it.
This is a hack to disable Alt + F4.
private void test_FormClosing(object sender, FormClosingEventArgs e)
{
if (this.ModifierKeys == Keys.Alt || this.ModifierKeys == Keys.F4)
{
e.Cancel = true;
}
}
Subscribe FormClosing event
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = e.CloseReason == CloseReason.UserClosing;
}
Only one line in the method body.
This does the job:
bool myButtonWasClicked = false;
private void Exit_Click(object sender, EventArgs e)
{
myButtonWasClicked = true;
Application.Exit();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (myButtonWasClicked)
{
e.Cancel = false;
}
else
{
e.Cancel = true;
}
}
Would FormClosing be called even when you're programatically closing the window? If so, you'd probably want to add some code to allow the form to be closed when you're finished with it (instead of always canceling the operation)
Hide close button on form by using the following in constructor of the form:
this.ControlBox = false;