Detecting a key press in different controls

Question

4.00/5 (1 vote)

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I have 2 controls in which I want to detect a key pressed.
At first I used

VB

Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs)
...
MyBase.OnKeyDown(e)
End Sub

but I discovered that the key pressed event was raised in the wrong control so I used

VB

Private Sub EditBox_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown

End Sub

Thinking this would focus the keydown event, but it doesn't

Help??

Posted 22-Apr-11 0:45am

Stuart Nathan

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Ankit Rajput 22-Apr-11 6:51am

Your question is not clear.
Please ask clearly what you want to know?

1 solution

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E.F. Nijboer · Answer 1 · 2011-04-22T01:11:00

Solution 1

In the first piece of code you override OnKeyDown. This is done when you are a derived class and need to do something yourself when this event occurs.

In the second piece of code you handle the event with the EditBox_KeyDown. You need to make sure that you implement the event handler for each control.

If you want to get the keydown event for the overall form (no matter what control is focused), you set the KeyPreview of the Form to True and create a handler for the form keydown event. Have a look here for more info:
http://msdn.microsoft.com/en-us/library/system.windows.forms.form.keypreview%28v=vs.71%29.aspx[^]

Good luck!

Posted 22-Apr-11 1:11am

E.F. Nijboer

Comments

Stuart Nathan 22-Apr-11 8:39am

KeyPreview does not seem to apply to a control - only a form.

E.F. Nijboer 22-Apr-11 10:35am

Yes, that is correct. But even if a control has focus, the keydown event of the form will fire before the that of the control. Maybe you could give some additional information because it might not be completely clear.

Stuart Nathan 22-Apr-11 11:05am

I have had a look at the form on which these controls are placed and yes
KeyPreview=True
I have set it to false and debugging.

E.F. Nijboer 22-Apr-11 11:10am

With KeyPreview=True the event of both the Form and the control should get raised unless the Form event is actively clearing the event.

Stuart Nathan 22-Apr-11 11:14am

Actually one of the controls did raise the event, but not the other.
Still it seems to be working - so a big thankyou!

Sergey Alexandrovich Kryukov 22-Apr-11 22:22pm

Disagree with vote of 3, I voted 5.
--SA

Stuart Nathan 23-Apr-11 5:47am

Sorry. I pressed a key and found I couldn't go back and edit.
Perhaps you could explain how to.
What are they used for?

E.F. Nijboer 26-Apr-11 3:22am

What do you mean? What are you editing?

Stuart Nathan 26-Apr-11 3:25am

The vote button on the solution

E.F. Nijboer 26-Apr-11 5:38am

Ah, I understand. You should have the option to vote again. That will replace your original vote.