public static IEnumerable <ExtendedCultureInfo> GetFallBack(
[NotNull] this ICultureInfoProvider provider,
[NotNull] CultureInfo culture)
{
if (provider == null)
{
throw new ArgumentNullException(nameof(provider));
}
if (culture == null)
{
throw new ArgumentNullException(nameof(culture));
}
ExtendedCultureInfo extendedCultureInfo = provider.Get(culture);
if (extendedCultureInfo == null)
{
throw new ArgumentException(
string.Format(Resources.CultureHelper_GetFallBack_UnknownCulture, culture),
nameof(culture));
}
HashSet <ExtendedCultureInfo> yielded = new HashSet <ExtendedCultureInfo>();
// First return the culture passed in
yield return(extendedCultureInfo);
yielded.Add(extendedCultureInfo);
// Next return any descendants in a breadth first order
Queue <ExtendedCultureInfo> queue = new Queue <ExtendedCultureInfo>(provider.GetChildren(extendedCultureInfo));
while (queue.TryDequeue(out ExtendedCultureInfo childCulture))
{
yield return(childCulture);
foreach (ExtendedCultureInfo child in provider.GetChildren(childCulture))
{
queue.Enqueue(child);
}
}
// Lastly return the ancestors and each ones children, excluding invariant
extendedCultureInfo = extendedCultureInfo.Parent;
while (!extendedCultureInfo.IsInvariant)
{
yield return(extendedCultureInfo);
yielded.Add(extendedCultureInfo);
foreach (ExtendedCultureInfo child in provider.GetChildren(extendedCultureInfo))
{
if (!yielded.Contains(child))
{
yield return(child);
}
}
extendedCultureInfo = extendedCultureInfo.Parent;
}
if (!yielded.Contains(extendedCultureInfo))
{
yield return(extendedCultureInfo);
}
}
/// <summary>
/// Gets the specified culture information.
/// </summary>
/// <param name="cultureInfo">The culture information.</param>
/// <returns></returns>
public CurrencyInfo Get(ExtendedCultureInfo cultureInfo)
{
CurrencyInfo currencyInfo;
return cultureInfo.RegionInfo != null &&
_currencyInfos.TryGetValue(cultureInfo.RegionInfo.ISOCurrencySymbol, out currencyInfo)
? currencyInfo
: null;
}
/// <summary>
/// Gets the <see cref="CurrencyInfo" /> from the specified extended culture information.
/// </summary>
/// <param name="cultureInfo">The culture information.</param>
/// <returns>
/// The associated <see cref="CurrencyInfo" /> if found; otherwise <see langword="null" />.
/// </returns>
public CurrencyInfo Get(ExtendedCultureInfo cultureInfo)
{
return(null);
}
/// <summary>
/// Gets the <see cref="CurrencyInfo" /> from the specified extended culture information.
/// </summary>
/// <param name="cultureInfo">The culture information.</param>
/// <returns>
/// The associated <see cref="CurrencyInfo" /> if found; otherwise <see langword="null" />.
/// </returns>
public CurrencyInfo Get(ExtendedCultureInfo cultureInfo)
{
return null;
}