How to close multiple child form using escape button in C#

Question

2.50/5 (2 votes)

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i had use this code

if (e.KeyCode == Keys.Escape)
            {
                this.Close();
            }

in key down event of the mdi form

What I have tried:

only working in the single child form other child forms are not closed...

Posted 29-Mar-18 2:33am

Member 11776570

Updated 31-Mar-18 10:14am

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Comments

Richard MacCutchan 29-Mar-18 9:02am

This is your third post of this problem. I get the feeling your design needs looking at.

Member 11776570 29-Mar-18 9:08am

now i get the solution. thank u for your feedback

3 solutions

Solution 1

You can add more forms to the list - each form has a 'real' name, like form1, form2, &etc. If you make sure they are in scope than you can go through a list of them in your onclick event (or, in this case, the ESC key).

if (e.KeyCode == Keys.Escape)  {

                form1.Close();
                form2.Close();
                form3.Close();
                form4.Close();

} // if (e.KeyCode == Keys.Escape)

You could, if clever, even create conditions so only the appropriate windows close on this even.

Posted 29-Mar-18 2:40am

W∴ Balboos, GHB

Solution 3

@User-11743105

There is no need to enable 'KeyPreview in the MDI child forms: just write a 'KeyPreview handler in the MDIParentForm; it will receive key events from all child Forms:

private void MDIParentForm1_KeyDown(object sender, KeyEventArgs e)
{
            if (e.KeyCode == Keys.Escape)
            {
                Control callingControl = sender as Control;

                if (
                    MessageBox.Show(
                        "Really Quit ?",
                        "Quit Application ?", 
                        MessageBoxButtons.OKCancel,
                        MessageBoxIcon.Warning,
                        MessageBoxDefaultButton.Button2,
                        0

                    )
                    == DialogResult.OK
                )
                {
                    // for debugging only
                    if (callingControl != null) Console.WriteLine($"Escape pressed in: {callingControl.Text}");

                    Application.Exit();
                }
            }
        }
    }
}

Posted 31-Mar-18 10:15am

BillWoodruff

Updated 31-Mar-18 12:30pm

v2

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Member 11776570 · Accepted Answer · 2018-03-29T02:58:00

Solution 2

it will work

if (e.KeyCode == Keys.Escape) { this.Close(); }

just change the setting of each

child form

and set

keypreview = true

in each child form setting.

Posted 29-Mar-18 2:58am

Member 11776570