public static DynamicDateFormatInfo GetInstance(string calendarModelId, IFormatProvider provider = null)
{
if (provider == null)
{
provider = CultureInfo.CurrentCulture;
}
string cInfId = calendarModelId + "_" + provider.ToString();
if (infoCacheS.ContainsKey(cInfId))
{
return(infoCacheS[cInfId]);
}
DateTimeFormatInfo x = DateTimeFormatInfo.GetInstance(provider);
var inf = new DynamicDateFormatInfo(x);
if (string.IsNullOrEmpty(calendarModelId))
{
return((DynamicDateFormatInfo)inf.Clone());
}
var model = DynamicCalendarModel.GetCachedModel(calendarModelId);
if (model != null && model.FormatInfo != null)
{
inf.CalendarModelID = calendarModelId;
var mi = model.FormatInfo;
inf.Import(mi);
}
return(inf);
}
// Expand a pre-defined format string (like "D" for long date) to the real format that
// we are going to use in the date time parsing.
// This method also convert the dateTime if necessary (e.g. when the format is in Universal time),
// and change ddfi if necessary (e.g. when the format should use invariant culture).
//
private static String ExpandPredefinedFormat(String format, ref DynamicDateFormatInfo ddfi)
{
switch (format[0])
{
case 'o':
case 'O': // Round trip format
ddfi = DynamicDateFormatInfo.InvariantInfo;
break;
case 'r':
case 'R': // RFC 1123 Standard
ddfi = DynamicDateFormatInfo.InvariantInfo;
break;
case 's': // Sortable without Time Zone Info
ddfi = DynamicDateFormatInfo.InvariantInfo;
break;
case 'u': // Universal time in sortable format.
ddfi = DynamicDateFormatInfo.InvariantInfo;
break;
case 'U': // Universal time in culture dependent format.
// Universal time is always in Greogrian calendar.
//
// Change the Calendar to be Gregorian Calendar.
//
ddfi = (DynamicDateFormatInfo)ddfi.Clone();
//if (ddfi.Calendar.GetType() != typeof(GregorianCalendar))
{
//ddfi.Calendar = GregorianCalendar.GetDefaultInstance();
}
break;
}
format = GetRealFormat(format, ddfi);
return(format);
}
