how to only allow to input numberic using C# WPF in tablet

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Hi all,

I have a issue which need everyone's help.

I have C# WPF project which run in tablet.
my textboxs only allow to input numberic and I did this on English keyboard,
but when I change to japanese keyboard in tablet, I can input japanese character.

When change to japanese keyboard, I want to only input numberic and con't allow to input japanese character.

could you help me this?

thanks in advance

Posted 11-Jul-15 16:06pm

ngthtra

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-07-11T17:00:00

Solution 2

If I can assume that the input goes in TextBox, you can always filter out unwanted characters.

You need to use the event PreviewTextInput, which you can cancel. For example

C#

using System.Windows;

// ...

static bool IsNumericOnly(string value) {
    foreach(char digit in value)
        if (!char.IsDigit(digit))
            return false;
    return true;
} //IsNumericOnly
// you can use something more complicated instead,
// for example, Regex

// ...

textBox.PreviewTextInput += (sender, eventArgs) => {
    eventArgs.Handled = !IsNumericOnly(eventArgs.Text);
};

—SA

Posted 11-Jul-15 17:00pm

Sergey Alexandrovich Kryukov

Comments

Afzaal Ahmad Zeeshan 11-Jul-15 23:15pm

Thank you for your comment on my (totally stupid and vague) post, I understand handling event should have also been posted because OP might not have known how to write it.

I will keep it in mind, I wonder how it slipped off my mind. :-)

4ed; also there was a problem that he was encountering, he needs to check for Japanese characters also, which IsDigit won't be able to solve. That is why, I used IsNumber which checks whether character is a character in Unicode. I hope that might be the reason why his code doesn't work in Japanese culture but does in English.

Sergey Alexandrovich Kryukov 11-Jul-15 23:31pm

Thank you Afzaal. And I really appreciate your constructive response to criticism; this has always been one of the key to success.

I don't really know how IsDigit behaves in the cultures with different numerical characters (normally they are additional to globally used Western ones, such as Eastern Arabic or Indian numerals). I suspect that this function only accounts for Western digits in all cultures. Nevertheless, my code sample is only the example of how input filtering is done.

—SA