/// <summary>
/// 將日期當作是「西元」年處理。
/// </summary>
/// <param name="dtString">日期字串。 </param>
/// <param name="method">如果日期缺少的欄位用何種方式補上。</param>
/// <returns></returns>
public static DateTime? ParseGregorian(string dtString, PaddingMethod method)
{
PatternMatcher matcher = new PatternMatcher(dtString.Trim());
if (!matcher.IsSuccess)
return null;
else
{
string assembly;
if (method == PaddingMethod.None)
{
foreach (Group each in matcher.EachGroup())
if (!each.Success) return null;
assembly = matcher.GetReassemblyString();
}
else
{
int year, month, day, hour, minute, second;
DateTimePaddingInfo padding = new DateTimePaddingInfo(method);
ExtractInfo(matcher, padding, out year, out month, out day, out hour, out minute, out second);
assembly = year + "/" + month + "/" + day + " " + hour + ":" + minute + ":" + second;
}
DateTime result;
if (DateTime.TryParse(assembly, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, out result))
return result;
else
return null;
}
}
private static void ExtractInfo(PatternMatcher matcher, DateTimePaddingInfo padding, out int year, out int month, out int day, out int hour, out int minute, out int second)
{
if (matcher.ContainField(DateTimeField.Year))
year = matcher.GetFieldValue(DateTimeField.Year);
else
year = padding.GetYear();
if (matcher.ContainField(DateTimeField.Month))
month = matcher.GetFieldValue(DateTimeField.Month);
else
month = padding.GetMonth();
if (matcher.ContainField(DateTimeField.Day))
day = matcher.GetFieldValue(DateTimeField.Day);
else
day = padding.GetDay(year, month);
if (matcher.ContainField(DateTimeField.Hour))
hour = matcher.GetFieldValue(DateTimeField.Hour);
else
hour = padding.GetHour();
if (matcher.ContainField(DateTimeField.Minute))
minute = matcher.GetFieldValue(DateTimeField.Minute);
else
minute = padding.GetMinute();
if (matcher.ContainField(DateTimeField.Second))
second = matcher.GetFieldValue(DateTimeField.Second);
else
second = padding.GetSecond();
}
