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Localization for Persian Language…

Shift in .Net handling of culture data

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There’s been a shift of handling culture data in .Net 4. This may have influences on attempts in fixing Persian culture.

The shift is simple, while prior to version 4, CLR insisted on using privately stored culture data in a “culture.nlp” binary resource, version 4 gave up and uses windows API to get data from operating system. This is why some complained about missing CultureTableRecord while using PersianCalendar.

Culture Data Prior to .Net 4

Following sequence shows how culture data are handled in prior to version 4:

  1. CultureInfo constructor calls CultureTableRecord.GetCultureTableRecord

    image

  2. CultureTableRecord constructor uses CultureTable.Default.GetDataItemFromCultureName:image
  3. The Default property returns m_defaultInstance field which is initialized in class initializer:image
  4. Finally InitializeBaseInfoTablePointers loads “culture.nlp” from assembly resources:image
  5. where “culture.nlp” can be found in mscorlib resources:

image

There’s also a CalendarTable class with virtually same approach

image

 

CultureData in .Net 4

The above approach has been totally depreciated in .Net 4. Now CLR prefers to use windows API to retrieve culture data. For instance following excerpt is from disassembly of CalandarData code where CLR attempts to enumerate optional calendars by calling EnumCalendarInfoExEx:

image

Conclusion

There’s been a shift in handling culture data in .Net 4: Now CLR prefers to use windows API to get culture data This will have influences in fixing Persian culture as I will describe in later posts.

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Written by Babak Mahmoudi

September 14, 2011 at 9:11 am

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