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Hi guys, I have a problem on how to make keyDown active when press and inactive when release. I wrote a code for display a color, which is when press it shown green and when release return to black. I attached my code below.

What I have tried:

private void MainWindow_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.NumPad1)
            {
                set1Disp.BackColor = Color.Green;
            }

            else if (e.KeyCode == Keys.NumPad3)
            {
                set2Disp.BackColor = Color.Green;
            }
	   {
Posted
Updated 12-May-22 23:51pm

1 solution

Handle the KeyUp event as well, and add a bool - "KeyPressed" which you check in the Up handler to see if you should change the colour back.
   
Comments
Member 15627303 11-May-22 14:15pm
   
if use KeyDown event to be inactive when release, then my code need to use with KeyUP event. correct me if I am wrong.
Gerry Schmitz 11-May-22 15:16pm
   
There's no such thing as "inactive" or "active" key events; they're all active all the time. They are handled (code) or ignored or defaulted or some combination thereof; those are your options.

"e.Handled" for a given key (true/false) is maybe what you're looking for.

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