private static DateTime?DateTimePartImpl(string line, LogLineDescriptor descriptor)
{
if (line.Length < descriptor.DatetimeIndexStart + descriptor.DatetimeLength)
{
return(null);
}
var possibleTimeStamp = line.Substring(descriptor.DatetimeIndexStart, descriptor.DatetimeLength);
return(DateTime.TryParseExact(possibleTimeStamp, descriptor.DateTimeFormatString, CultureInfo.InvariantCulture,
DateTimeStyles.None, out var t) ? t : (DateTime?)null);
}
public DateTime?DateTimePart(string line)
{
if (m_logLineDescriptor == null)
{
// Evaluate the appropriate descriptor for the line
foreach (var logLineDescriptor in m_logLineDescriptors)
{
if (DateTimePartImpl(line, logLineDescriptor) != null)
{
m_logLineDescriptor = logLineDescriptor;
break;
}
}
}
if (m_logLineDescriptor == null)
{
return(null);
}
return(DateTimePartImpl(line, m_logLineDescriptor));
}