Detect Enter Key C#

Question

I have the following code which does not show the MessageBox when enter/return is pressed.

For any other key(i.e. letters/numbers) the MessageBox shows False.

private void cbServer_TextChanged(object sender, EventArgs e)
{
    if (enterPressed)
    {
        MessageBox.Show("Enter pressed");
    }
    else
        MessageBox.Show("False");
}

private void cbServer_Keydown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Enter || e.KeyCode == Keys.Return)
    {
        enterPressed = true;
        MessageBox.Show("Enter presssed: " + enterPressed);

    }
    else
        enterPressed = false;
}

Any ideas?

EDIT: Above code, I thought the issue was with the _Keydown even so I only posted that.

Also. Have you tried debugging? You should use OEMReturn or what it is also — Cole Tobin, Aug 16 '12 at 09:29
What kind of control is cbServer? a combobox? and is a wpf or winforms app? — Steve, Aug 16 '12 at 09:30
What control is the event handler attached to? cbServer? Try attaching it to the form instead — jle, Aug 16 '12 at 09:31

score 12 · Answer 1 · answered Aug 16 '12 at 09:29

12

in your form designer class (formname.designer.cs) add this :

this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Login_KeyPress);

and add this code to backbone code (formname.cs):

void Login_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar == (char)13)
            MessageBox.Show("ENTER has been pressed!");
        else if (e.KeyChar == (char)27)
            this.Close();
    }

answered Aug 16 '12 at 09:29

Maziar Aboualizadehbehbahani

1,976
17
37

it also handle Escape key to close your form, I think it is may be useful – Maziar Aboualizadehbehbahani Aug 16 '12 at 09:30
this.cbServer.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.cbServer_KeyPress); This was already in the designer.cs file... – k1f1 Aug 16 '12 at 09:42
Sorry I see that is using Keypress not KeyDown.. Will try using that, thanks – k1f1 Aug 16 '12 at 09:45
1

just for completeness, you can type "if (e.KeyChar == (char)Keys.Enter)" which I think looks nicer – Rob Nov 04 '15 at 12:00

score 7 · Accepted Answer · answered Aug 16 '12 at 09:54

7

This is because when you press Enter TextChanged event won't fire.

answered Aug 16 '12 at 09:54

Renatas M.

11,694
1
43
62

score 0 · Answer 3 · answered Nov 07 '16 at 04:37

0

private void textBox_PreviewKeyDown(object sender, KeyEventArgs e)
 {
            if (e.Key == Key.Enter)
            {
                MessageBox.Show("Enter key pressed");
            }
            else if (e.Key == Key.Space)
            {
                MessageBox.Show("Space key pressed");
            }
}

Use PreviewKeyDown event to detect any key before shown in textbox or input

answered Nov 07 '16 at 04:37

MD. ROKON-UZ-ZAMAN

11
1

unable to find an "e.Key" option in PreviewKeyDown – Budapest Jun 07 '20 at 00:12

Budapest · Answer 4 · 2020-06-07T02:14:46.053

0

void cbServer_PreviewKeyDown(object sender, System.Windows.Forms.PreviewKeyDownEventArgs e)
    {

        // Check if User Presses Enter
        if (e.KeyCode == System.Windows.Forms.Keys.Return)
        {
            // Here: user pressed ENTER key

        }
        else
        {
            // Here: user did not press ENTER key
        }
    }

edited Jun 07 '20 at 02:14

answered Jun 07 '20 at 00:18

Budapest

105
7

Detect Enter Key C#

4 Answers4

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