How can i convert english digits to arabic digits?

问题:

I have this C# code for example

DateTime.Now.ToString("MMMM dd, yyyy");

Now the current thread is loading the Arabic culture. So the result is like this

???? 19, 2010

But i don't want the '2010' and the '19' to be in English (also known as Latin or West Arabic digits) - I want East Arabic numbers like "٢".

I tried

DateTime.Now.ToString("MMMM dd, yyyy", CultureInfo.GetCultureInfo("ar-lb"));

gave the same result. So any idea?

回答1:

Thy this workaround (just list all cultures you want to use this numerals in the string array):

private static class ArabicNumeralHelper
{
    public static string ConvertNumerals(this string input)
    {
        if (new string[] { "ar-lb", "ar-SA" }
              .Contains(Thread.CurrentThread.CurrentCulture.Name))
        {
            return input.Replace('0', '\u06f0')
                    .Replace('1', '\u06f1')
                    .Replace('2', '\u06f2')
                    .Replace('3', '\u06f3')
                    .Replace('4', '\u06f4')
                    .Replace('5', '\u06f5')
                    .Replace('6', '\u06f6')
                    .Replace('7', '\u06f7')
                    .Replace('8', '\u06f8')
                    .Replace('9', '\u06f9');
        }
        else return input;
    }
}

Then use the method, for all of your strings you want to have 'central Arabic numerals' in, like this:

DateTime.Now.ToString().ConvertNumerals();

回答2:

As a quick test, I wrote this to list all the cutures which don't have "2010" in the year:

        foreach (var ci in 
            from c in CultureInfo.GetCultures(CultureTypes.AllCultures)
            where !c.IsNeutralCulture
            let date = DateTime.Now.ToString("MMMM dd, yyyy", c)
            where !date.Contains("2010")
            orderby c.Name
            select new {c.Name, date})
        {
            Console.WriteLine("{0} : {1}", ci.Name, ci.date);
        }

the results are:

ar-SA : ربيع الأول 05, 1431
dv-MV : ربيع الأول 06, 1431
prs-AF : ربيع الأول 06, 1431
ps-AF : ربيع الأول 06, 1431
th-TH : กุมภาพันธ์ 19, 2553

To convert the numbers to Arabic text, it looks like this "NumToArabicString" project will do it. It doesn't look like there's anything built into the .net framework though.

回答3:

The only solution is to manually convert the digits.

You could use the CurrentCulture.NumberFormat.NativeDigits array instead of explicitly providing the Unicode characters to support any other languages in addition to the Arabic-Indic digits, but as far as builtin support by culture-aware classes such as DateTime it seems unimplemented or something.

回答4:

Try this:

public static string ToIndicDigits(this string input)
{
        return input.Replace('0', '\u0660')
                .Replace('1', '\u0661')
                .Replace('2', '\u0662')
                .Replace('3', '\u0663')
                .Replace('4', '\u0664')
                .Replace('5', '\u0665')
                .Replace('6', '\u0666')
                .Replace('7', '\u0667')
                .Replace('8', '\u0668')
                .Replace('9', '\u0669');
    }
}

回答5:

You can use the Windows.Globalization.NumberFormatting.NumeralSystemTranslator class to translate between the Latin and any of the supported numeral systems. To translate to Arabic, set the NumeralSystem property to "Arab", then you can call the TranslateNumerals method.

Alternatively you can just use Windows.Globalization.DateTimeFormatting.DateTimeFormatter class directly.

回答6:

We use Arabic numerals in English. As such, what you're seeing is the correct - and only possible - behaviour.