/// <summary> /// Returns a specific culture given an arbitrary CultureInfo, which may be null, the invariant /// culture, or a neutral culture. /// </summary> public static CultureInfo GetSpecificCulture(CultureInfo runCulture) { // Assume default culture unless we can do better. CultureInfo specificCulture = TypeConverterHelper.InvariantEnglishUS; if (runCulture != null) { // Assign _cachedCultureMap to a local variable for thread safety. The reference assignment // is atomic and the CachedCultureMap class is immutable. CachedCultureMap cachedCultureMap = _cachedCultureMap; if (cachedCultureMap != null && object.ReferenceEquals(cachedCultureMap.OriginalCulture, runCulture)) { return(cachedCultureMap.SpecificCulture); } // Unfortunately we cannot use reference comparison here because, for example, new CultureInfo("") // creates an invariant culture which (being a new object) is obviously not the same instance as // CultureInfo.InvariantCulture. if (runCulture != CultureInfo.InvariantCulture) { if (!runCulture.IsNeutralCulture) { // It's already a specific culture (neither neutral nor InvariantCulture) specificCulture = runCulture; } else { // Get the culture name. Note that the string expected by CreateSpecificCulture corresponds // to the Name property, not IetfLanguageTag, so that's what we use. string cultureName = runCulture.Name; if (!string.IsNullOrEmpty(cultureName)) { try { CultureInfo culture = CultureInfo.CreateSpecificCulture(cultureName); specificCulture = SafeSecurityHelper.GetCultureInfoByIetfLanguageTag(culture.IetfLanguageTag); } catch (ArgumentException) { // This exception occurs if the culture name is invalid or has no corresponding specific // culture. we can safely ignore the exception and fall back to TypeConverterHelper.InvariantEnglishUS. specificCulture = TypeConverterHelper.InvariantEnglishUS; } } } } // Save the mapping so the next call will be fast if we're given the same runCulture. // Again, the reference assignment is atomic so this is thread safe. _cachedCultureMap = new CachedCultureMap(runCulture, specificCulture); } return(specificCulture); }
/// <summary> /// Returns a specific culture given an arbitrary CultureInfo, which may be null, the invariant /// culture, or a neutral culture. /// </summary> public static CultureInfo GetSpecificCulture(CultureInfo runCulture) { // Assume default culture unless we can do better. CultureInfo specificCulture = TypeConverterHelper.InvariantEnglishUS; if (runCulture != null) { // Assign _cachedCultureMap to a local variable for thread safety. The reference assignment // is atomic and the CachedCultureMap class is immutable. CachedCultureMap cachedCultureMap = _cachedCultureMap; if (cachedCultureMap != null && object.ReferenceEquals(cachedCultureMap.OriginalCulture, runCulture)) return cachedCultureMap.SpecificCulture; // Unfortunately we cannot use reference comparison here because, for example, new CultureInfo("") // creates an invariant culture which (being a new object) is obviously not the same instance as // CultureInfo.InvariantCulture. if (runCulture != CultureInfo.InvariantCulture) { if (!runCulture.IsNeutralCulture) { // It's already a specific culture (neither neutral nor InvariantCulture) specificCulture = runCulture; } else { // Get the culture name. Note that the string expected by CreateSpecificCulture corresponds // to the Name property, not IetfLanguageTag, so that's what we use. string cultureName = runCulture.Name; if (!string.IsNullOrEmpty(cultureName)) { try { CultureInfo culture = CultureInfo.CreateSpecificCulture(cultureName); specificCulture = SafeSecurityHelper.GetCultureInfoByIetfLanguageTag(culture.IetfLanguageTag); } catch (ArgumentException) { // This exception occurs if the culture name is invalid or has no corresponding specific // culture. we can safely ignore the exception and fall back to TypeConverterHelper.InvariantEnglishUS. specificCulture = TypeConverterHelper.InvariantEnglishUS; } } } } // Save the mapping so the next call will be fast if we're given the same runCulture. // Again, the reference assignment is atomic so this is thread safe. _cachedCultureMap = new CachedCultureMap(runCulture, specificCulture); } return specificCulture; }