KeyPress F1 does not work C#

Question

I'm designing a device app. Compact Framework 2.0

I want the user to press F1 to navigate to the next screen, but it does not work.

Can't seem to find a solution.

Is it possible?

This is how I normally use Keypress:

This works:

        if (e.KeyChar == (char)Keys.M)
        {
            MessageBox.Show("M pressed");
            e.Handled = true;
        }

This dos NOT work:

        if (e.KeyChar == (char)Keys.F1)
        {
            MessageBox.Show("F1 pressed");
            e.Handled = true;
        }

"Duplicate" : http://stackoverflow.com/questions/5951496/how-do-i-capture-keys-f1-regardless-of-the-focused-control-on-a-form — , Jul 30 '13 at 13:21
Do u have a function key (fn) on your device? In other words do u have to press fn+F1 to access F1's functionality? — Paddyd, Jul 30 '13 at 13:23
@RameshRams I have tried that example. And it does not work for me. — Werner van den Heever, Jul 30 '13 at 13:27

score 8 · Accepted Answer · answered Jul 30 '13 at 13:22

8

try this

private void Form1_Load(object sender, EventArgs e)
{
    this.KeyPreview = true;
    this.KeyDown += new KeyEventHandler(Form1_KeyDown);
}

void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode.ToString() == "F1")
    {
        MessageBox.Show("F1 pressed");
    }
}

answered Jul 30 '13 at 13:22

3

While this does actually work, I really think you should consider ANY of the other answers - Use the Enum values, instead of comparing strings. – Lars Kristensen Aug 21 '13 at 07:23
So it should read: `if (e.KeyData == Keys.F1)` – TaW Jul 28 '22 at 17:34

score 7 · Answer 2 · edited May 23 '17 at 12:01

Refer This

You can override the ProcessCmdKey method of your form class and use keyData == Keys.F1 to check whether F1 is pressed. Above link has example as follows.

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    if (keyData == Keys.F1)
    {
        MessageBox.Show("You pressed the F1 key");
        return true;    // indicate that you handled this keystroke
    }

    // Call the base class
    return base.ProcessCmdKey(ref msg, keyData)
}

score 2 · Answer 3 · answered Jul 30 '13 at 13:36

Some keys(like f1,f2,arrow keys ,tab ....)cannot be "captured" by keychar for that you need to use keycode:

if (e.KeyCode == Keys.F1)
{
  // do stuff
}

keychar property - http://msdn.microsoft.com/en-us/library/system.windows.forms.keypresseventargs.keychar.aspx

score 0 · Answer 4 · answered Jul 30 '13 at 13:22

0

Use KeyDown instead of KeyPress:

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyData == Keys.F1)
    {
        // your code here
    }
}

Also set KeyPreview to true

answered Jul 30 '13 at 13:22

ProgramFOX

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KeyPress F1 does not work C#

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