C# Cannot handle Ctrl+K event of textbox

Question

I would like to perform some actions when the user presses Ctrl + K on a textbox.

 private void subject_TextBox_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Control && e.KeyCode == Keys.K)
                  MessageBox.Show("!");
        }

Nothing happens when I run it.

When I debug I can see that e.Control is true (this means I pressed Ctrl) but the e.KeyCode is not equivalent to K.

Any ideas?

@Ivar, 76 or Shift, which is definitely not right: I press Ctrl _K. — user3165438, May 10 '16 at 09:23
@user3165438:- Try `if (e.KeyData == (Keys.Control | Keys.K))` — Rahul Tripathi, May 10 '16 at 09:24
I tried your code and it works fine for me. By setting a breakpoint to `MessageBox.Show("!");` `e.KeyCode` is 75. — Wudge, May 10 '16 at 09:27
`LButton` is your left mouse button. Are you clicking it by any chance? — Ivar, May 10 '16 at 09:35
`KeyData` contains `ShiftKey`, but `Shift` is `false`. Something is strange. Could some other event handler have changed the event? Or could it have something to do with localization? Just throwing around Ideas. — Fabian S., May 10 '16 at 09:37
@FabianH, May this is since the Ctrl is captured but the event is fired before I press K as well? — user3165438, May 10 '16 at 09:39
ShiftKey and Shift are not the same thing - [Difference between Keys.Shift and Keys.ShiftKey](http://stackoverflow.com/questions/6446927/c-sharp-difference-between-keys-shift-and-keys-shiftkey) — stuartd, May 10 '16 at 09:39
@stuartd, Thanks. This means that the Ctrl is captured as well as the other key capture. Why the other key is recognized as shiftkey? — user3165438, May 10 '16 at 09:42
[Related question](http://stackoverflow.com/questions/24325430/control-keydown-event-trap-ctrl-c-etc) — stuartd, May 10 '16 at 09:51
BTW...don't trust the visualizer for key press data...it lies to you because it's an interpretation of flags and not fixed values. — DonBoitnott, May 10 '16 at 12:06

Brendon · Answer 1 · 2016-05-10T11:28:43.893

1

 protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        if (keyData == (Keys.Control | Keys.K) && focusedTextbox == subject_TextBox)
        {
           //Some Code
        }
    }
private TextBox focusedTextbox = null;


 private void subject_TextBox_KeyDown(object sender, KeyEventArgs e)
        {
            MethodName(e.KeyCode)
        } 
 private void MethodName(Keys keys)
    {
        focusedTextbox = (TextBox)sender;
    }

Use this code, this should work i have tested it myself and it will work, you will want to run the 'MethodName' method in each textbox, or if you can find a better way to change the 'focusedTextBox' field then do that hope this helped.

edited May 10 '16 at 11:28

answered May 10 '16 at 11:10

Brendon

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Testing this properly on my own i have found that using KeyDown won't work because it takes one key at a time, so it will only get the first key – Brendon May 10 '16 at 11:20
1

Thanks, This is probably the problem reason. Upvoted. – user3165438 May 10 '16 at 12:08
No Problem, if it is correct, tick it so when people come onto this question they will know the answer – Brendon May 10 '16 at 12:32

score 0 · Answer 2 · edited May 23 '17 at 10:28

0

In the KeyDown event, you just ask for the 'state' of the keyboard.

You might want to check out this topic:

Capture multiple key downs in C#

edited May 23 '17 at 10:28

Community

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answered May 10 '16 at 09:29

Proliges

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score 0 · Accepted Answer · answered May 10 '16 at 09:45

0

Really don't know what is the problem reason.
May the event is fired as soon as the Ctrl is pressed, without waiting to the K to be pressed as well.

However, when I use the same code in the TextBox_KeyUp event, it works fine.

answered May 10 '16 at 09:45

user3165438

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C# Cannot handle Ctrl+K event of textbox

3 Answers3