How to count character in a textbox, xbap application

Hi!

I have textbox that have fixed size in GUI and I need to know how many character I can put into it.

For example, the textbox can contain 5 character in GUI and I wan to check if this string "234567.333" is not to large for the textbox, if it is then I wan to highlight the textbox.text = "#####" (like exel).

Is there any easy way to count how many character a fixed size textbox can contain? Cant use Graphics.MeasureString method cause it is a xbap application.

re: How to count character in a textbox, xbap application

Is the font also a fixed width, like courier?
If you are using a variable width font like Ariel then the short answer is 'no'.
MMMMMMMMMMMMMMMMMMMM
IIIIIIIIIIIIIIIIIIII

See the difference?

re: How to count character in a textbox, xbap application

The font is arial or times

re: How to count character in a textbox, xbap application

Those are both proportional-width fonts. (Not fixed width)
So you can't predict the number of characters that will fit since more skinny characters will fit than fat characters.

re: How to count character in a textbox, xbap application

What you might be able to do, and I stress *might* (because I don't really know much about XBAP other than what I just wikipedia'd right now), is write to a hidden auto-size label object and see if the width of that label is larger than your text box (ie, pixel width).

I know, I know, total hack (if it even works) but hey, it never hurts to try and be creative :D