how to close parent form in wpf ?

Question

1.00/5 (1 vote)

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I need to find a way to close parent form in wpf.

this code is work for C#

C#

private void button1_Click(object sender, EventArgs e)
{
    Form2 frm2 = new Form2();
    frm2.FormClosed += new FormClosedEventHandler(frm2_FormClosed);
    frm2.Show();
    this.Hide();
}

private void frm2_FormClosed(object sender, FormClosedEventArgs e)
{
    this.Close();
}

but i need WPF.

Does anyone know?

Posted 28-Jul-14 9:08am

sajjad bararjanian

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Comments

Sergey Alexandrovich Kryukov 28-Jul-14 15:21pm

Even with Forms, this code makes no sense.
—SA

3 solutions

Solution 1

Why?
Why not just:

C#

private void button1_Click(object sender, EventArgs e)
{
    Form2 frm2 = new Form2();
    Hide();
    frm2.ShowDialog();
    Close();
}

Posted 28-Jul-14 9:10am

OriginalGriff

Comments

sajjad bararjanian 28-Jul-14 15:16pm

Because CPU usage is must reduce

Sergey Alexandrovich Kryukov 28-Jul-14 15:20pm

Irrelevant!
—SA

Sergey Alexandrovich Kryukov 28-Jul-14 15:20pm

~~No. Sorry, but ShowDialog does not require Close.~~
—SA

OriginalGriff 28-Jul-14 15:23pm

It does if you want to close Form1, as his original example code does...

Sergey Alexandrovich Kryukov 28-Jul-14 15:28pm

Sorry, I misread what you are actually closing...
—SA

OriginalGriff 28-Jul-14 15:39pm

Easily done...: laugh:

Sergey Alexandrovich Kryukov 28-Jul-14 19:38pm

Still, such code makes little sense. If you show some form as modal using ShowDialog, hiding any other form is not needed; they are not clickable until modal state ends.
—SA

OriginalGriff 29-Jul-14 1:54am

I'm not so sure - there are times when it makes some sense, so as to not confuse the user.
Perhaps when the main screen is about connecting and logging in - so when complete you don't want the user to see it again unless he logs out. Remember this is just a "sample fragment" of bigger code which might make a lot more sense.

Sergey Alexandrovich Kryukov 29-Jul-14 10:50am

Well, this is rather a matter of culture. People used to see the same windows of the application when a dialog is being shown. But if course I understand your point.
—SA

sajjad bararjanian 28-Jul-14 16:19pm

private void button1_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2();
Hide();
frm2.ShowDialog();
Close();
}
this code was close main form and exit program immediately.
how can solve this problem?

OriginalGriff 29-Jul-14 4:18am

It will close the main form (and thus the application) when the second form is closed, and not before: exactly as your example code did.

Solution 2

Why not reading original MSDN documentation?

All you need is this: http://msdn.microsoft.com/en-us/library/system.windows.window.close(v=vs.110).aspx[^].

See also:
http://msdn.microsoft.com/en-us/library/system.windows.uielement.isvisible(v=vs.110).aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.window.show(v=vs.110).aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.window.hide(v=vs.110).aspx[^].

See the sub-section "Lifetime Management" here: http://msdn.microsoft.com/en-us/library/system.windows.window%28v=vs.110%29.aspx[^].

It does not matter from where it is called from, from a method of what window, or not a window (as soon as it is called from the same UI thread). Besides, there is no such thing as "parent" window. There is a main window, owned window…

—SA

Posted 28-Jul-14 9:26am

Sergey Alexandrovich Kryukov

Comments

sajjad bararjanian 28-Jul-14 15:42pm

That's not useful.

Sergey Alexandrovich Kryukov 28-Jul-14 19:39pm

No, this is actually all you need.
—SA

sajjad bararjanian 28-Jul-14 15:58pm

Sorry, I have question : how we can close windows 1 and open windows 2 in wpf ?

Sergey Alexandrovich Kryukov 28-Jul-14 19:40pm

Read my answer more thoroughly; and you will see how to do it. Or explain your concerns.
And please tell me: are you the one who voted 1 or 3 for the answer? Would be interesting...
—SA

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sajjad bararjanian · Accepted Answer · 2014-08-27T09:34:00

I've tested it and it worked for me.
You might also try to give you the same result

Thanks

C#

private void Button_Click(object sender, RoutedEventArgs e)
{
     NewMain win=new NewMain();
     win.Owner = this;
     this.Visibility = Visibility.Hidden;
     win.ShowDialog();
     this.Close();
}

how to close parent form in wpf ?

3 solutions

Solution 1

Solution 2

Solution 4

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