WPF Key is digit or number

Question

I have previewKeyDown method in my window, and I\'d like to know that pressed key is only A-Z letter or 1-0 number (without anyF1..12,

Answer 1

bit of a cludge but it works :)

 private void TextBox_KeyDown(object sender, KeyEventArgs e)
    {
        Regex R = new Regex("^([A-Z]|[0-9]){1}$");

        var strKey = new KeyConverter().ConvertToString(e.Key);
        if(strKey.Length > 1 )
        {
            strKey = strKey.Replace("NumPad", "").Replace("D", "");
        }
        if (strKey.Length == 1)
        {
            if (!R.IsMatch(strKey))
            {
                e.Handled = true;
            }
        }
        else
        {
            e.Handled = true;
        }
    }