break button_click event when enter pressed

Question

Is an easy way to cancel click event when user hit enter on button (instead of mouse click on button?)

i have tried with:

    private void button3_Click(object sender, EventArgs e)
    {
        KeyEventArgs ke = e as KeyEventArgs;
        if (ke != null)
        {
            if (ke.KeyCode == Keys.Enter)
            {
                return;
            }

        }
    }

But ke is null

Not sure why you'd want to do this. This is a standard feature of how Windows programs work and you should strive to stay with the norm (except in some unusual situations). If you don't want it to be the default button then you can remove that from the Form's properties. — awudoin, Sep 25 '13 at 18:30
I'm using barcode scanner in my winform. I have set up scanner to hit enter after every scan. But if button of form has focus and user scan an barcode, button will do click event (because barcode scanner scan code and 'hit' enter) — iskrzycki, Sep 25 '13 at 18:37
I would think a better approach would be to disable the button until a valid input is entered via whatever text box. This would prevent accidental "clicking" with the scanner and would still maintain a standard that users have come to expect with WinForms. I know many users prefer to use a keyboard over a mouse (I often do) and disabling the enter button would annoy them. — awudoin, Sep 25 '13 at 18:41
In this form user must scan few barcodes, and set few things on comboboxes, listboxes and other windows, so all of controls must be enabled during this operation — iskrzycki, Sep 25 '13 at 18:44

score 3 · Accepted Answer · answered Sep 25 '13 at 18:31

3

public void btnClick(object sender, EventArgs e)
{
  bool IsMouse = (e is System.Windows.Forms.MouseEventArgs);

  // If not mouse, they hit spacebar or enter
}

answered Sep 25 '13 at 18:31

Gary Walker

8,831
3
19
41

BTW, I remember the way I figured out this solution originally. I ran the code in the debugger and inspected the object type when I ran it using mouse and keyboard to trigger the button and saw that they were different object types. If you use Enter/Space you get the type EventArgs, so you can't test against EventArgs as MouseEventArgs descends from EventArgs – Gary Walker Sep 25 '13 at 19:00

score 2 · Answer 2 · answered Sep 25 '13 at 18:26

2

Yes it will be null. because EventArgs is not KeyEventArgs

KeyEventArgs will be passed as a parameter to KeyDown or KeyUp events. You're messing up things.

answered Sep 25 '13 at 18:26

Sriram Sakthivel

72,067
7
111
189

Moreover, button3_Click is event handler subscribed for a Click event for the Button class, so it meant that Button is Clicked, not Pressed – Alan Turing Sep 25 '13 at 18:30

score 1 · Answer 3 · answered Sep 25 '13 at 18:33

1

You can do something like this

private bool flag = false;
private void button1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (e.KeyChar == (char)Keys.Return)
    {
        flag = true;
    }
}

private void button1_Click(object sender, EventArgs e)
{
    if (flag)
    {
        flag = false;
        return;
    }
    //else do original task
}

answered Sep 25 '13 at 18:33

Hossain Muctadir

3,546
1
19
33

A bit messy, but propably will work :) Thanks, but @Gary Walker posted in my opinion better solution – iskrzycki Sep 25 '13 at 18:40

score 0 · Answer 4 · answered Sep 25 '13 at 18:33

0

You can handle KeyPress event for the button and disable or ignore enter key there instead of returning in button click

answered Sep 25 '13 at 18:33

appcoder

639
1
9
19

score 0 · Answer 5 · edited May 07 '15 at 10:55

0

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            if ((keyData & Keys.KeyCode) == Keys.Enter)
            {
                SendKeys.Send("{Tab}");
                return true;
            }
            return false;
        }

edited May 07 '15 at 10:55

Alex Filatov

2,232
3
32
39

answered May 07 '15 at 10:08

Zaw Zaw Myint Tun

1

break button_click event when enter pressed

5 Answers5