How to use numeric keypad to replace english numbers

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I have been using the below code to replace English numbers with Arabic numbers at run-time, in a new form I only need the numeric keypad to replace the numbers and keep everything else as it is.

How to achieve the whole idea?

C#

private void ArabicNumbers_KeyPress(object sender, KeyPressEventArgs e)
    {
        switch (e.KeyChar)
        {
            case '0': e.KeyChar = '٠'; break;

            case '1': e.KeyChar = '١'; break;

            case '2': e.KeyChar = '٢'; break;

            case '3': e.KeyChar = '٣'; break;

            case '4': e.KeyChar = '٤'; break;

            case '5': e.KeyChar = '٥'; break;

            case '6': e.KeyChar = '٦'; break;

            case '7': e.KeyChar = '٧'; break;

            case '8': e.KeyChar = '٨'; break;

            case '9': e.KeyChar = '٩'; break;
        }
    }

What I have tried:

I tried to convert KeyCode/KeyChar and vice versa but couldn't get the required results

Posted 29-Oct-19 1:29am

Moosa Arbeed

Updated 8-Nov-19 3:59am

Maciej Los

v2

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3 solutions

Solution 1

Please, read this: Keys Enum (System.Windows.Forms) | Microsoft Docs[^]

If you want to catch key press event (key down) for numeric keypad only, you have to check if e.KeyCode[^] is between NumPad0 and NumPad9 ;)

C#

private void ArabicNumbers_KeyDown(object sender, KeyPressEventArgs e)
    {
        switch (e.KeyCode)
        {
            case Keys.NumPad0: e.KeyChar = '٠'; break;

            case Keys.NumPad1: e.KeyChar = '١'; break;

            case Keys.NumPad2: e.KeyChar = '٢'; break;

            case Keys.NumPad3: e.KeyChar = '٣'; break;

            case Keys.NumPad4: e.KeyChar = '٤'; break;

            case Keys.NumPad5: e.KeyChar = '٥'; break;

            case Keys.NumPad6: e.KeyChar = '٦'; break;

            case Keys.NumPad7: e.KeyChar = '٧'; break;

            case Keys.NumPad8: e.KeyChar = '٨'; break;

            case Keys.NumPad9: e.KeyChar = '٩'; break;
        }
    }

Posted 29-Oct-19 2:18am

Maciej Los

Updated 29-Oct-19 3:32am

v2

Comments

Moosa Arbeed 29-Oct-19 9:53am

nothing has changed

[no name] 29-Oct-19 12:26pm

Form's Key Preview may help. Check Form.KeyPreview Property (System.Windows.Forms) | Microsoft Docs[^]

[no name] 29-Oct-19 12:28pm

A 5. Maybe you should also mention Key Preview ;)

[no name] 30-Oct-19 14:52pm

Nevertheless a second trial to send a comment on this :-)
Most probably it is worth to give OP a hint that maybe Form's KeyPreview is relevant ;)
Bruno

Matthew Dennis 30-Oct-19 17:33pm

test

Solution 2

"English Numbers" are also know as Western Arabic, and what you are looking for is converting to Eastern Arabic.

One option is to get the value and get the appropriate UTF code, where the numbers begin at U+0660.

Another option would be use manual conversion of the culture info, as seen here:
c# - Converting Numbers from Western Arabic Digits "1,2,3..." to Eastern Arabic Digits "١, ٢, ٣...." - Stack Overflow[^]

Posted 29-Oct-19 5:18am

MadMyche

Comments

Moosa Arbeed 29-Oct-19 11:32am

I do not want to go through cultures, I just want to replace the numbers at run-time using the same function "using key events only"
the thing is, I just want to replace those numbers using the numpad "keypad"
while number at the top of the keyboard will remain the same

Maciej Los 30-Oct-19 5:00am

5ed!

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Moosa Arbeed · Accepted Answer · 2019-11-08T04:00:00

I figured it out myself

C#

private bool _isKeyNumPadClick;

    private void TxtEdtDocNo_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9)
        {
            _isKeyNumPadClick = true;
        }

        else if (e.KeyCode < Keys.D0 || e.KeyCode > Keys.D9)
        {
            _isKeyNumPadClick = false;
        }
    }


    private void Numbers_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (_isKeyNumPadClick)
        {
            switch (e.KeyChar)
            {
                case '0': e.KeyChar = '٠'; break;

                case '1': e.KeyChar = '١'; break;

                case '2': e.KeyChar = '٢'; break;

                case '3': e.KeyChar = '٣'; break;

                case '4': e.KeyChar = '٤'; break;

                case '5': e.KeyChar = '٥'; break;

                case '6': e.KeyChar = '٦'; break;

                case '7': e.KeyChar = '٧'; break;

                case '8': e.KeyChar = '٨'; break;

                case '9': e.KeyChar = '٩'; break;
            }
        }
        else
        {
            switch (e.KeyChar)
            {
                case '0': e.KeyChar = '0'; break;

                case '1': e.KeyChar = '1'; break;

                case '2': e.KeyChar = '2'; break;

                case '3': e.KeyChar = '3'; break;

                case '4': e.KeyChar = '4'; break;

                case '5': e.KeyChar = '5'; break;

                case '6': e.KeyChar = '6'; break;

                case '7': e.KeyChar = '7'; break;

                case '8': e.KeyChar = '8'; break;

                case '9': e.KeyChar = '9'; break;
            }
        }

        _isKeyNumPadClick = false;
    }