I have 2 forms, form1 is the menu, with the buttons start, settings, quit, and form2 is where the program will run.
The problem I face is that if the user uses Alt+F4 on form2, it closes form2, but form1 runs in the background. I know I can use the form2 Closing event, so it can run an Environment.Exit(0), but that closing event also "activates" if I use the form2 "Back to Menu" button, which closes form2. I also tried just hiding form2 with the Menu button, but then when I need to call another form2, it opens up a new instance of it.
So, in summary: ALT+F4 should close the whole application, not just the current form, but can't use form2 Closing event, because I want to close form2 some other way too.
You can use KeyDownevent for that. Basically, you catch that key combination, tell the system that you are going to process it so it does not get passed to it and finally close the application. To close it, is always better to use Application.Exit() instead of Environment.Exit. You can see why here for example:
private void Form2_KeyDown(object sender, KeyEventArgs e)
{
if (e.Alt && e.KeyCode == Keys.F4)
{
e.Handled = true;
//Close your app
Application.Exit();
}
}
Related
I am trying to make one windows application which contains two forms. In form1(Parent) i created one button for open second form. On that button click event i want to close form1(parent) form and open form2(child) without closing form2, but when i am press that button both forms are closed so how can I do it?
Rather than using .Close() consider using .Hide() on your parent form, this shouldn't dispose of it but rather have it hidden.
Note that exiting out of your Child form means your application won't exit. To circumvent this you should consider subscribing to the OnFormClosed event to handle the form closure.
If you look in "Program.cs" there is a form to start with.
When this form is closed, the application is terminated.
enter image description here
It should be used as a way to hide the startup form.
Even if the child form is closed with the start form hidden, the program does not end.
As #Ae774 said, you need to handle it separately.
If you want to close form1(parent) form and open form2(child) form without closing form2 by click the button, you can refer to the following code:
private void button1_Click(object sender, EventArgs e)
{
Form2 f2 = new Form2();
Hide();
f2.ShowDialog();
Close();
}
If you want to open the parent form after the child form is closed, you can refer to this code:
private void button1_Click(object sender, EventArgs e)
{
Form2 f2 = new Form2();
Hide();
f2.ShowDialog();
Show();
}
Here is the test result
I have a C# Form, where you have Form1 shown at the start, and when you press Go you are taken to Form2. Form1 is hidden and Form2 is shown.
Now when you exit form2, the whole application should be closed. I am using Application.Exit() when I press the exit button.
I am facing problems if the user presses X or ALT+F4 or RightClick->Close.
The form will close but the hidden form will stay opened.
How can I fix that? When I press one of these control button, for all hidden forms to also close?
I tried form1_Close and Form1_Closing function but they didn't seem to work.
Try this:
Hide();
Form2 form2 = new Form2();
form2.Closed += (s, args) => this.Close();
form2.Show();
This will close Form1 when you close Form2. If the user presses X or ALT+F4 or RightClick -> Close on Form2 The Form2 and the hidden Form1 will close.
Use the FormClosed event on Form2 to exit the application.
private void Form2_FormClosed(object sender, FormClosedEventArgs e)
{
Application.Exit();
}
So, my project currently has two forms (Form1, Form2). When a user presses the login button Form1 is hidden and Form2 is shown. For some reason while running the program, if you press the X at the top right of Form2 it will close Form2 but keep Form1 running and hidden. How do I set it so that the X button will close both forms completely (so that you don't need to go back into Visual Studio to close it).
I assume your Form1 is the 'main' form, in other words, that's the form that's launched when you launch the application. So this would be your main thread, and Form2 is a form that's opened upon some event, and that form runs in a different thread.
So, when the Form2 is closed if you want the main program to exit as well (although this doesn't quite seem like a great design idea), then you'd have to use Application.Exit().
You can capture your form 'closing' event in your Form2 by adding the Form2_FormClosing event handler, and in it, you call the above method.
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
Application.Exit();
}
}
I have a C# Form, where you have Form1 shown at the start, and when you press Go you are taken to Form2. Form1 is hidden and Form2 is shown.
Now when you exit form2, the whole application should be closed. I am using Application.Exit() when I press the exit button.
I am facing problems if the user presses X or ALT+F4 or RightClick->Close.
The form will close but the hidden form will stay opened.
How can I fix that? When I press one of these control button, for all hidden forms to also close?
I tried form1_Close and Form1_Closing function but they didn't seem to work.
Try this:
Hide();
Form2 form2 = new Form2();
form2.Closed += (s, args) => this.Close();
form2.Show();
This will close Form1 when you close Form2. If the user presses X or ALT+F4 or RightClick -> Close on Form2 The Form2 and the hidden Form1 will close.
Use the FormClosed event on Form2 to exit the application.
private void Form2_FormClosed(object sender, FormClosedEventArgs e)
{
Application.Exit();
}
I have program that opens subwindows inside of it (mdi.parent). I have made component that is in one window under it, however, i want that that window never actually disposed after its created because i want to keep only one instance of it.
This can be made with code:
// This prevents this window disposing from window close button, we want always show one and only
// one instance of this window.
FormClosing += (o, e) =>
{
Hide();
e.Cancel = true;
};
However, after this there is problem, closing program requires pressing close button press twice. First press closes subwindow and second terminates program. How this can be get around?
I am working with Winforms.
As Habib said, you can call Application.Exit, but:
The Form.Closed and Form.Closing events are not raised when the
Application.Exit method is called to exit your application
If this is important to you, you can do something like this (MDI parent code):
private Boolean terminating;
protected override void OnClosing(CancelEventArgs e)
{
if (!terminating)
{
terminating = true;
Close();
}
base.OnClosing(e);
}
Call Application.Exit() in the form close event.
Application.Exit - MSDN
Informs all message pumps that they must terminate, and then closes
all application windows after the messages have been processed.
The code inside of your FormClosing event handler method is a bit too terse. It does its job of preventing the user from closing the form, but as you've also noticed, it prevents you from closing the form programmatically as well.
This is easily solved by testing the value of the CloseReason property of the FormClosingEventArgs that are passed in each time the event is raised.
These will tell you the reason why the form is attempting to close. If the value is CloseReason.UserClosing, then you want to set e.Cancel to true and hide the form. If the value is something else, then you want to allow the form to continue closing.
// This prevents this window disposing when its close button is clicked by the
// user; we want always show one and only one instance of this window.
// But we still want to be able to close the form programmatically.
FormClosing += (o, e) =>
{
if (e.CloseReason == CloseReason.UserClosing)
{
Hide();
e.Cancel = true;
}
};
Use This
Form[] ch = this.MdiChildren;
foreach (Form chfrm in ch)
chfrm.Close();
You can use Application.Exit if there is no processing happening when the application is closed. Otherwise, you can check Application.OpenForms collection in MDI parent's closing event and close all the other forms that are open.