Check for Key press event in C#

Question

I have a List<System.Windows.Forms.Keys>. I want to check if all Keys in the list are pressed in a keydown event.

But how?

My method is:

public bool Triggered( string indentifier, KeyEventArgs e )
{
    List<Keys> keys = Shortcuts.Keys.First( x => Shortcuts[x].Indentifier == indentifier );
    keys.Reverse();
    foreach( Keys key in keys )
    {
        if ( e.KeyCode != key )
            return false;
    }

    return true;
}

Getting the keys works but the check don't.

e.KeyCode is the same Key every time. But when I do if( e.KeyCode == Keys.Control && e.KeyCode == Keys.S ) in the real KeyDownEvent it works — SmoothOS, Jun 09 '18 at 10:54
Welcome to Stack Overflow! Please, read the [ask] page and update your question. — Jeroen Heier, Jun 09 '18 at 10:54
what type of keys are present in the list? are there and command keys like Ctril,Shift,Alt etc? — Lucifer, Jun 09 '18 at 10:55
Jeroen Heier I'm not very good at english and not able to write productive questions — SmoothOS, Jun 09 '18 at 10:56
Yes, I reversed the list because KeyCode is Key.ControlKey and keys[0] was Keys.S before reversing — SmoothOS, Jun 09 '18 at 10:58
The order I add the key list is first Keys.ControlKey and then Keys.S — SmoothOS, Jun 09 '18 at 11:03
How can e.KeyCode be 2 Keys at the same time? if( e.KeyCode == Keys.ControlKey && e.KeyCode == Keys.S ) would return true — SmoothOS, Jun 09 '18 at 11:06
Shortcuts is Dictionary,ShortcutInfo> and ShortcutInfo is a class with two properties called Indentifier and Desc — SmoothOS, Jun 09 '18 at 11:10

Lucifer · Accepted Answer · 2018-06-09T11:32:19.487

1

Answer to your question Why is e.KeyCode the same key every time but when I do if ( e.KeyCode == Keys.Control && e.KeyCode == Keys.S ) because it is a flag enum (answer for detailed explanation).

you can do is change your code to :

 List<Keys> keys = Shortcuts.Keys.First( x => Shortcuts[x].Indentifier == indentifier );
 keys.Reverse();

 Keys allKey = Keys.None;
 keys.ForEach(ele => allKey |= ele);

 return (e.KeyData == allKey);

edited Jun 09 '18 at 11:32

answered Jun 09 '18 at 11:25

Lucifer

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I have another question... Why is e.KeyCode the same key every time but when I do if( e.KeyCode == Keys.Control && e.KeyCode == Keys.S ) in the real KeyDownEvent it would return true? – SmoothOS Jun 09 '18 at 11:29
@SmoothOS if this answer helped please mark it correct – Lucifer Jun 09 '18 at 11:38
When I press a key the program hang up for about 3 seconds. I think there is a problem with your code snippet – SmoothOS Jun 09 '18 at 11:43
@SmoothOS I have tried that code and does not go in hang state,debug and see where is it hanging? – Lucifer Jun 09 '18 at 11:45
It hangs at the line where I check for 3 keys – SmoothOS Jun 09 '18 at 11:51
which are those three keys ? – Lucifer Jun 09 '18 at 11:53
Keys.Control Keys.Shift Keys.S – SmoothOS Jun 09 '18 at 11:53
1

I think I got the problem – SmoothOS Jun 09 '18 at 12:06

Check for Key press event in C#

1 Answers1