KeyDown : recognizing multiple keys

Question

How can I determine in KeyDown that CtrlUp was pressed.

private void listView1_KeyDown(object sender, KeyEventArgs e)
{
           


        

Answer 1

you can try my working code :

private void listView1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Up)
    {
        if(e.Alt==true){
            //do your stuff
        }
    }
}

i use this code because i don't know why when i use :

(e.Keycode == Keys>up && e.Alt==true)

didn't work.

Answer 2

In the KeyEventArgs there are properties Ctrl, Alt and Shift that shows if these buttons are pressed.

Answer 3

You can use the ModifierKeys property:

if (e.KeyCode == Keys.Up && (ModifierKeys & Keys.Control) == Keys.Control)
{
    // CTRL + UP was pressed
}

Note that the ModifierKeys value can be a combination of values, so if you want to detect that CTRL was pressed regardless of the state of the SHIFT or ALT keys, you will need to perform a bitwise comparison as in my sample above. If you want to ensure that no other modifiers were pressed, you should instead check for equality:

if (e.KeyCode == Keys.Up && ModifierKeys == Keys.Control)
{
    // CTRL + UP was pressed
}

Answer 4

It took me a while to find the hint I ultimately needed when trying to detect [Alt][Right]. I found it here: https://social.msdn.microsoft.com/Forums/vstudio/en-US/4355ab9a-9214-4fe1-87ea-b32dfc22946c/issue-with-alt-key-and-key-down-event?forum=wpf

It boils down to something like this in a Shortcut helper class I use:

public Shortcut(KeyEventArgs e) : this(e.Key == System.Windows.Input.Key.System ? e.SystemKey : e.Key, Keyboard.Modifiers, false) { }

public Shortcut(Key key, ModifierKeys modifiers, bool createDisplayString)
{
    ...
} 

After "re-mapping" the original values (notice the e.Key == System.Windows.Input.Key.System ? e.SystemKey : e.Key part), further processing can go on as usual.

Answer 5

you have to remember the pressed keys (ie in a bool array). and set the position to 1 when its pressed (keydown) and 0 when up .

this way you can track more than one key. I suggest doing an array for special keys only

so you can do:

 if (e.KeyCode == Keys.Control)
 {
        keys[0] = true;
 }
// could do the same with alt/shift/... - or just rename keys[0] to ctrlPressed

if (keys[0] == true && e.KeyCode == Keys.Up)
 doyourstuff

Answer 6

if (e.Control && e.Shift && e.KeyCode == Keys.A) {

}