/// <summary>
/// Gets the tz database id from <see cref="TimeZoneInfo"/>.
/// </summary>
/// <param name="timeZoneInfo"><see cref="TimeZoneInfo"/>.</param>
/// <param name="preferredTzId">Preferred TzId type.</param>
/// <returns>tz database id corresponds to the Windows time zone id.</returns>
public static string GetTzIdFromTimeZoneInfo(TimeZoneInfo timeZoneInfo, PreferredTzId preferredTzId = PreferredTzId.Default)
{
string id;
if (!TryGetTzIdFromTimeZoneInfo(timeZoneInfo, out id, preferredTzId))
{
throw new TimeZoneInfoNotFoundException(String.Format(ResourceMessage.ErrorMessages.TimeZondIdNotFound, timeZoneInfo.Id));
}
return(id);
}
/// <summary>
/// Gets <see cref="TimeZoneInfo"/> from Windows time zone id.
/// </summary>
/// <param name="windowsId">tz database id.</param>
/// <returns><see cref="TimeZoneInfo"/>.</returns>
/// <exception cref="TimeZoneInfoNotFoundException">Thrown if the time zone id is not found.</exception>
public static TimeZoneInfo GetTimeZoneInfoFromWindowsId(string windowsId, PreferredTzId preferredTzId = PreferredTzId.Default)
{
TimeZoneInfo result;
Exception exception;
if (PRESUME_WINDOWS_TIME_ZONE_ENVIRONMENT)
{
if (!tryGetSystemTimeZoneInfo(windowsId, out result, out exception))
{
Exception ex;
tryGetTzTimeZoneInfoFromWindowsId(windowsId, out result, out ex, preferredTzId);
}
}
else
{
if (!tryGetTzTimeZoneInfoFromWindowsId(windowsId, out result, out exception, preferredTzId))
{
if (exception == null)
{
tryGetSystemTimeZoneInfo(windowsId, out result, out exception);
}
else
{
tryGetSystemTimeZoneInfo(windowsId, out result);
}
}
}
if (result == null)
{
string message = String.Format(ResourceMessage.ErrorMessages.TimeZoneInfoNotFoundForId, windowsId);
if (exception != null)
{
throw new TimeZoneInfoNotFoundException(message, exception);
}
else
{
throw new TimeZoneInfoNotFoundException(message);
}
}
return(result);
}
/// <summary>
/// Gets System TimeZoneInfo which has Tz database id.
/// </summary>
/// <param name="windowsId"></param>
/// <param name="timeZoneInfo"><see cref="TimeZoneInfo"/>.</param>
/// <param name="exception"><see cref="Exception"/> which was thrown while finding TimeZone.</param>
/// <param name="preferredTzId">Preferred TzId type.</param>
/// <returns>true if the <see cref="TimeZoneInfo"/> is found, otherwise false.</returns>
private static bool tryGetTzTimeZoneInfoFromWindowsId(string windowsId, out TimeZoneInfo timeZoneInfo, out Exception exception, PreferredTzId preferredTzId = PreferredTzId.Default)
{
TimeZoneInfo tzi = null;
Exception ex = null;
string id;
if (TryGetTzIdFromWindowsId(windowsId, out id, preferredTzId))
{
if (!tryGetSystemTimeZoneInfo(id, out tzi, out ex))
{
string id2;
if (preferredTzId != PreferredTzId.Default && TryGetTzIdFromWindowsId(windowsId, out id2, PreferredTzId.Default) && id != id2)
{
tryGetSystemTimeZoneInfo(id2, out timeZoneInfo);
}
}
}
timeZoneInfo = tzi;
exception = ex;
if (timeZoneInfo == null)
{
return(false);
}
return(true);
}
/// <summary>
/// Gets the tz database id from <see cref="TimeZoneInfo"/>.
/// </summary>
/// <param name="timeZoneInfo"><see cref="TimeZoneInfo"/>.</param>
/// <param name="tzId">tz database id corresponds to the Windows time zone id.</param>
/// <param name="preferredTzId">Preferred TzId type.</param>
/// <returns>true if the tz database id is found, otherwise false.</returns>
public static bool TryGetTzIdFromTimeZoneInfo(TimeZoneInfo timeZoneInfo, out string tzId, PreferredTzId preferredTzId = PreferredTzId.Default)
{
string id = timeZoneInfo.Id;
if (TZ_ID_TO_WINDOWS_ID_MAP.ContainsKey(id))
{
tzId = id;
return(true);
}
return(TryGetTzIdFromWindowsId(id, out tzId, preferredTzId));
}
/// <summary>
/// Gets the tz database id corresponds to a Windows time zone id.
/// </summary>
/// <param name="windowsId">Windows time zone id.</param>
/// <param name="tzId">tz database id corresponds to the Windows time zone id.</param>
/// <param name="preferredTzId">Preferred TzId type.</param>
/// <returns>true if the tz database id is found, otherwise false.</returns>
public static bool TryGetTzIdFromWindowsId(string windowsId, out string tzId, PreferredTzId preferredTzId = PreferredTzId.Default)
{
// To increase possiblity to clear TIME_ZONE_ID_DATABASE, always try to load lazy map for this small map(TerritoryIndipendetnMap).
var territoryIndipendentMap = WINDOWS_ID_TO_TZ_ID_TERRITORY_INDIPENDENT_MAP;
if (territoryIndipendentMap != null && preferredTzId == PreferredTzId.TerritoryIndipendent)
{
if (territoryIndipendentMap.TryGetValue(windowsId, out tzId))
{
return(true);
}
}
return(WINDOWS_ID_TO_TZ_ID_MAP.TryGetValue(windowsId, out tzId));
}
