Only allow special characters in Textbox when pressing keys on keyboard

Question

I need a textbox where the user only can work with uppercase characters. Also some special characters like - _ and <.

I wonder if there could be a ways to catch the PreviewKeyDown or KeyDown Event to convert the pressed keys to UpperCase.

MyTextBox1 > System.Windows.Input.KeyEventArgs > Key is ReadOnly.

Any idea how that can be managed?

possible duplicate http://stackoverflow.com/questions/1103765/wpf-textbox-how-to-define-some-restriction — LPL, Nov 09 '11 at 10:11
no dublicate because just I searched on `KeyDown` (as idea) like the other question but only needed UpperCase and in this case I do not need to touch my huge way using `KeyDown` just WPF. — Nasenbaer, Nov 09 '11 at 11:05

score 3 · Accepted Answer · edited May 23 '17 at 12:29

3

You don't need to do that, you can just use the CharacterCasing property

<TextBox CharacterCasing="Upper" />

Other than that if you need a more general answer, look at my answer to How do I get a TextBox to only accept numeric input in WPF? here

edited May 23 '17 at 12:29

Community

answered Nov 09 '11 at 10:02

Ray

What a great simple answer. I thought it is not too difficult but not thought that is that easy! Thanks for quick reply Ray! – Nasenbaer Nov 09 '11 at 10:14

1 Answers1