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The global minded
programmer
Andries Nieuwenhuize
Quadrant software B.V.
September 2012

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Awareness & pragmatic
.Net implementation
Case studies: 3
Agenda

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Iedere programmeur
is cultureel gekleurd
Awareness

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• International Domain Name Mapping
• DNS (ASCII)
• quadrant.nl | bücher.de
• punycode
– bücher > > bcher-kva
– büücher > bcher-kvaa
– www.münchhausen.at
– www.xn—mnchhausen-9db.at
Case Study 1: DNS
new IdnMapping()
.GetAscii()
.GetUnicode()

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• Learned
– Globalization is more than translation
– Localized assumptions are everywhere
• Best Practice
– Let the (.Net) Framework do the talking.
– Design Localizable, do localization
afterwards.
Resumé

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System.Globalization.CultureInfo
3 levels :
• Invariant (cultureel agnostisch) “” – lijkt een
beetje op Engels
• Neutral (een taal, niet gebonden tot een region)
“en”
• Specific (een taal binnen een bepaalde region)
“en-US”
.NET Building blocks (1/3)

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• Thread.CurrentThread.CurrentCulture
– default culture for all classes in System.Globalization and thus affects
issues such as culture-specific formatting (such as date/time and
number/currency formats), parsing, and sorting.
• Thread.CurrentThread.CurrentUICulture
– default culture used by ResourceManagermethods and thus affects the
retrieval of user interface resources such as strings and bitmaps.
.NET Building blocks (2/3)

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• CultureInfo vs. RegionInfo
• "{0} | {1}", c.NativeName, new RegionInfo(c.LCID).NativeName
– Nederlands (Nederland) | Nederland
• RegionInfo : currency
• CultureInfo (remaining parts)
• Resumé
– CurrentCulture vs. CurrentUICulture
– CultureInfo vs. RegionInfo
– Invariant vs. Neutral vs. Specific
.NET Building blocks (3/3)

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Multilanguage with resources
• Thread | CurrentUICulture
• Strongly typed

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Don’t
Multilanguage with resources
Trans.Found
+ search.getNumberfound()
+ Trans.Out_of
+ search.getTotalEntries();
English:
“Found 4 out of 5”;
Nederlands:
“Gevonden 4 buiten 5”;
Do
• String.Format
string.Format(Trans.FoundTotalNu
mberFoundOutOfTotalEntries,
search.getNumberfound(),
search.getTotalEntries());
“Found {0} out of {1}.”
“{0} van de {1} gevonden.”

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Case Study: Format specifiers
C | D | E | F | G | N | P | R | X
var money = 123.456m;
"The money {0:C} is mine.";
Thread.CurrentThread.CurrentCulture =
new CultureInfo("en-US");
"The money {0:C3} is mine.";

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Linguistic (Equals)
• IEqualityComparer<T>
• (==) equality operator | "α".Equals("β")
Lexicographic (Compare to)
• IComparable<T>
• "α".CompareTo("β")
String Collation Functions (1/3)
Compare ≠ Equals

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"Æ".Equals("AE") –[en-US] > False
"Æ".Equals("AE") –[da-DK] > False
string.Compare("Æ“, "AE“)
StringComparison.CurrentCulture
[en-US]-> 0 | [da-DK]-> 1
StringComparison.InvariantCulture
[en-US]-> 0 | [da-DK]-> 0
StringComparison.Ordinal
[en-US]-> 133 | [da-DK]-> 133
String Collation Functions (2/3)
Culture ≠ Invariant ≠ Ordinal

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linguistic - lexicographic
CurrentCulture 100% - 100%
+= CaseInsensitive 100% - 52%
InvariantCulture 80% - 100%
+= CaseInsensitive 80% - 41%
Ordinal 0% - 100%
+= CaseInsensitive 0% - ?
String Collation Functions (3/3)
Compare

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Don’t
• Parse()
– “01/02/05”
• Jan 2 2005 US
• Feb 1 2005 UK
• Feb 5 2001 PR
China
– ToString(“YY/mm
/dd”);
DateTime
Do
• ParseExact()
• ToString(“d”)
• “d” ShortDatePattern
• “D” LongDatePattern
• “F” FullDateTimePattern

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Case Study 3: “-20000.15”
zh-HK (HK$20,000.15)
• The number -20000.15 formatted as currency.
da-DK kr -20.000,15
de-AT -€ 20.000,15
ja-JP -¥20,000
es-AR $-20.000,15
en-GB -£20,000.15
es-CL -$ 20.000,15
id-ID (Rp20.000)
de-DE -20.000,15 €

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• Kentekenplaten
• Postcodes
• Continent van een land
• Solution:
– Extent CultureInfo
Not covered

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• Awareness:
– Be a global minded programmer!
• Pragmatic
– Let the (.Net) Framework do the talking!
• Resources, format-specifiers, cultureInfo,
invariant, ordinal.
Conclusion

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• http://blogs.msdn.com/b/michkap/
• .NET Internationalization: The Developer’s Guide to Building Global
Windows and Web Applications
Consulted
Guy Smith-Ferrier