Convert String or Char to Keys object

Question

If I use the following code:

for (int i = 0; i < text.Length; i++)
    {
        char c = text[i];
        Keys k = (Keys)(byte)c;
        MessageBox.Show(c.T         


        

Answer 1

The answer is to build a reverse lookup table for the chars you need. The code could be optimized further but it is self explanatory. You could add special chars explicitly if needed.

You could also simultaneously build a dictionary to go the other way also should it take your fancy. Multi-key chars would require a trivial extension but they don't map directly to Keys anyway. For your perusal and possible extension should you require it:

using System.Windows.Forms;
static ImmutableDictionary CharVKeyLookup;
static void PopulateVKeyCharDictionary(){
    var keyboardStateNormal = new byte[255]; //All keys up
    var keyboardStateShift = new byte[255];
    keyboardStateShift[(int)Keys.ShiftKey] = 0x80;
    var charlookup = new Dictionary();
    for (var i = 1; i < (int) Keys.OemClear; i++){
        var keys = (Keys) i;
        //Verbose condition to ignore unnecessary conversions - probably a quicker way e.g. statically
        if (keys == Keys.Enter || keys == Keys.Tab || keys == Keys.Space
                || (keys >= Keys.D0 && keys <= Keys.D9)
                || (keys >= Keys.A && keys <= Keys.Z)
                || (keys >= Keys.Multiply && keys <= Keys.Divide)
                || (keys >= Keys.Oem1 && keys <= Keys.Oem102)){
            var normal = KeyCodeToUnicode(keys);
            var shift = KeyCodeToUnicode(keys, true);
            if (normal.Item2 == 1) //Ignore wierdos - extend this if you need it
                charlookup[normal.Item1[0]]=keys;
            if (shift.Item2 ==1)
                charlookup[shift.Item1[0]]=keys|Keys.Shift; //Incl shift mod
        }
    }
    charlookup['\n'] =  Keys.Return;
    charlookup['\r'] = Keys.Return;
    CharVKeyLookup = charlookup.ToImmutableDictionary();
}
/// string if it exists and return code. -1=dead char, 0=no translation, 1=1 char, 2=special char 
public static Tuple KeyCodeToUnicode(Keys key, byte[] keyboardState){
    var scanCode = MapVKToScanCode(key);
    var result = new StringBuilder(10,10);
    var language = InputLanguage.CurrentInputLanguage.Handle;//Or other method such as GetKeyboardLayout
    var returnState = ToUnicodeEx(key, scanCode, keyboardState, result, 10, 0,  language);
    return new Tuple(result.ToString(),returnState);
}
[DllImport("user32.dll")]
internal static extern int ToUnicodeEx(Keys wVirtKey, uint wScanCode, byte[] lpKeyState, [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pwszBuff, int cchBuff, uint wFlags, IntPtr dwhkl);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
internal static extern IntPtr GetKeyboardLayout(int dwLayout);