virtual public TimeZoneObservance?GetObservance(IDateTime dt)
{
if (Parent == null)
{
throw new Exception("Cannot call GetObservance() on a TimeZoneInfo whose Parent property is null.");
}
// Normalize date/time values within this time zone to a UTC value.
DateTime normalizedDt = dt.Value;
if (string.Equals(dt.TZID, TZID))
{
dt = new iCalDateTime(OffsetTo.ToUTC(dt.Value));
normalizedDt = OffsetTo.ToUTC(normalizedDt);
}
// Let's evaluate our time zone observances to find the
// observance that applies to this date/time value.
IEvaluator parentEval = Parent.GetService(typeof(IEvaluator)) as IEvaluator;
if (parentEval != null)
{
// Evaluate the date/time in question.
parentEval.Evaluate(Start, DateUtil.GetSimpleDateTimeData(Start), normalizedDt, true);
foreach (IPeriod period in m_Evaluator.Periods)
{
if (period.Contains(dt))
{
return(new TimeZoneObservance(period, this));
}
}
}
return(null);
}
/// <summary>
/// Returns a hash code for this instance.
/// </summary>
/// <returns>
/// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.
/// </returns>
public override int GetHashCode( )
{
int hash = 13;
if (TimeZoneName != null)
{
hash = (hash * 7) + TimeZoneName.GetHashCode( );
}
if (OffsetFrom != null)
{
hash = (hash * 7) + OffsetFrom.GetHashCode( );
}
if (OffsetTo != null)
{
hash = (hash * 7) + OffsetTo.GetHashCode( );
}
return(hash);
}
private void WriteRelocationTable(ref OffsetTo <byte[]> relocationTable)
{
mWriter.SeekBegin(mPositionBase + relocationTable.Offset);
mWriter.Write(relocationTable.Value);
}