How to Control Buttons via Numpad Keys in Winform?

I have this requirement that the users need to use the keyboard numpad keys to control specific button assigned to it and perform each function.

Example:

if Numpad key 0 is press then Button0 will be triggered.

Or

if(Numpad0 is pressed)
{
 //do stuff
  if (inputStatus)
        {
            txtInput.Text += btn0.Text;
        }
        else
        {
            txtInput.Text = btn0.Text;
            i开发者_JAVA百科nputStatus = true;
        }
}
else if(Numpad1 is pressed)
{
//do stuff
}

In my form i have a split container then all Buttons are located on a group box.

Set KeyPreview to true and handle KeyDown:

private void Form_KeyDown(object sender, KeyDownEventArgs e) {
    if(e.KeyCode >= Keys.NumPad0 && e.KeyCode <= Keys.NumPad9)
        ((Button) this["Button" + (e.KeyCode - Keys.NumPad0).ToString()]).PerformClick();
}

I haven't tested it, but that's about how I would do it.

Add a window handler for the keydown event:

private void Window_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys./*numpad keys*/)
    {
        // do something such as call the click handler for your button!
        e.Handled = true;
    }
}

Or you can do it for the Form instead! You didn't specify, but the logic is the same.

And don't forget to turn KeyPreview on. Use Keys.NumPad0, Keys.NumPad1, etc for the number pad keys. See MSDN for the Keys Enumeration.

If you want to prevent the keys default action being performed set e.Handled = true as shown above.

Set the Form's KeyPreview to true and handle the Form.KeyDown event.

private void Form_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.NumPad0)
    {
        Button0.PerformClick()
        e.Handled = true;
    }
    else if (e.KeyCode == Keys.NumPad1)
    {...}
    ...
}

By using ProcessCmdkey Solves the Problem:

 protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {       
           if (keyData == Keys.Numpad0)
                {
                    Numpad0.PerformClick();
                    return true;
                }

            return base.ProcessCmdKey(ref msg, keyData);
        }

Thanks