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Editorial Team
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Asked: 2026-05-16T04:51:55+00:00

I’m catching key hits with PreviewKeyDown event in my WPF component. I need to

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I’m catching key hits with PreviewKeyDown event in my WPF component. I need to distinguish characters being typed: letters vs. numbers vs. underscore vs. anything else.

Letters and numbers work fine (just convert the Key property of the KeyEventArgs object to string and work with character 0 of that string), but this won’t work for underscore.

It’s ToString value depends on localized keyboard settings (it shows up as “OemMinus” on EN/US keyboard and “OemQuestion” on CZ/QWERTY keyboard).

So how can I RELIABLY find out, if the typed char is underscore in the PreviewKeyDown event?

Thanks for any help

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1 Answer

  1. Editorial Team

    In the end, I had to rewrite the whole thing (and base it on text of the textarea which is being typed into),

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