据我所知，带有“o”和“s”参数的DateTime.ParseExact只能解析ISO 8601扩展格式。
如何使用c＃/ .Net？
解析ISO 8601基本格式和扩展格式答案 0 :(得分：1)
只需传递您希望允许的格式数组。
string[] formats = new[] {"o","s","yyyyMMddHHmmss"}; // whatever you want
DateTime dt = DateTime.ParseExact(yourDateString, formats,
CultureInfo.InvariantCulture,
DateTimeStlyes.None);
答案 1 :(得分：1)
这是我最终创建的用于解析基本格式和扩展格式的类：
static class Iso8601Formats
{
/// <summary>
/// Represents ISO 8601 extended time format.
/// </summary>
public static readonly string[] TimeExtended;
/// <summary>
/// Represents ISO 8601 basic time format.
/// </summary>
public static readonly string[] TimeBasic;
/// <summary>
/// Represents ISO 8601 both basic and extended time format.
/// </summary>
public static readonly string[] Time;
/// <summary>
/// Represents ISO 8601 extended date format.
/// </summary>
public static readonly string[] DateExtended;
/// <summary>
/// Represents ISO 8601 basic date format.
/// </summary>
public static readonly string[] DateBasic;
/// <summary>
/// Represents ISO 8601 both basic and extended time format.
/// </summary>
public static readonly string[] Date;
/// <summary>
/// Represents ISO 8601 extended date and time format.
/// </summary>
public static readonly string[] DateAndTimeExtended;
/// <summary>
/// Represents ISO 8601 basic date and time format.
/// </summary>
public static readonly string[] DateAndTimeBasic;
/// <summary>
/// Represents ISO 8601 both basic and extended date and time format.
/// </summary>
public static readonly string[] DateAndTime;
/// <summary>
/// Represents ISO 8601 extended date and/or time format.
/// </summary>
public static readonly string[] DateAndOrTimeExtended;
/// <summary>
/// Represents ISO 8601 basic date and/or time format.
/// </summary>
public static readonly string[] DateAndOrTimeBasic;
/// <summary>
/// Represents ISO 8601 both basic and extended date and/or time format.
/// </summary>
public static readonly string[] DateAndOrTime;
static Iso8601Formats()
{
// date format extended
IList<string> dateExtended = new List<string>{
"yyyy'-'MM'-'dd" // 1985-04-12
};
DateExtended = dateExtended.ToArray();
// date format basic
IList<string> dateBasic = new List<string>{
"yyyyMMdd" // 19850412
,"yyyy'-'MM" // 1985-04
,"yyyy" // 1985
,"'--'MMdd" // --0412
,"'---'dd" // ---12
};
DateBasic = dateBasic.ToArray();
// date both basic and extended format
List<string> date = new List<string>();
date.AddRange(dateBasic);
date.AddRange(dateExtended);
Date = date.ToArray();
// time format extended
IList<string> timeExtended = new List<string>{
"HH':'mm':'sszzz" // 10:22:00-0800
,"HH':'mm':'sszz" // 10:22:00-08
,"HH':'mm':'ssZ" // 10:22:00Z
,"HH':'mm':'ss" // 10:22:05
,"HH':'mm" // 10:22
,"HH" // 10
,"'-:'mm':'ss" // -22:07
,"'-:-:'ss" // -:-:07
};
TimeExtended = timeExtended.ToArray();
// time format basic
IList<string> timeBasic = new List<string>{
"HHmmsszzz" // 102200-0800
,"HHmmsszz" // 102200-08
,"HHmmssZ" // 102200Z
,"HHmmss" // 102205
,"HHmm" // 1022
,"HH" // 10
,"'-'mmss" // -2207
,"'--'ss" // --07
};
TimeBasic = timeBasic.ToArray();
// time format both basic and extended
List<string> time = new List<string>();
time.AddRange(timeBasic);
time.AddRange(timeExtended);
Time = time.ToArray();
// date-time basic
IList<string> dateTimeBasic =
CombineFormats(dateBasic, timeBasic);
DateAndTimeBasic = dateTimeBasic.ToArray();
// date-time extended
IList<string> dateTimeExtended =
CombineFormats(dateExtended, timeExtended);
DateAndTimeExtended = dateTimeExtended.ToArray();
// date-time both basic and extended
List<string> dateTime = new List<string>();
dateTime.AddRange(dateTimeBasic);
dateTime.AddRange(dateTimeExtended);
DateAndTime = dateTime.ToArray();
// date-and-or-time basic format
List<string> dateAndOrTimeBasic = new List<string>();
dateAndOrTimeBasic.AddRange(dateTimeBasic);
dateAndOrTimeBasic.AddRange(dateBasic);
foreach (string timeFormat in timeBasic)
{
dateAndOrTimeBasic.Add("'T'" + timeFormat);
}
DateAndOrTimeBasic = dateAndOrTimeBasic.ToArray();
// date-and-or-time extended format
List<string> dateAndOrTimeExtended = new List<string>();
dateAndOrTimeExtended.AddRange(dateTimeExtended);
dateAndOrTimeExtended.AddRange(dateExtended);
foreach (string timeFormat in timeExtended)
{
dateAndOrTimeExtended.Add("'T'" + timeFormat);
}
DateAndOrTimeExtended = dateAndOrTimeExtended.ToArray();
// date-and-or-time basic and extended format
List<string> dateAndOrTime = new List<string>();
dateAndOrTime.AddRange(dateAndOrTimeBasic);
dateAndOrTime.AddRange(dateAndOrTimeExtended);
DateAndOrTime = dateAndOrTime.ToArray();
}
/// <summary>
/// Produces all combinations of date and time formats
/// </summary>
/// <param name="dates">List of dates formats</param>
/// <param name="times">List of time formats</param>
private static IList<string> CombineFormats(IList<string> dates, IList<string> times)
{
List<string> dt = new List<string>();
foreach (string dateFormat in dates)
{
foreach (string timeFormat in times)
{
// year/month must be present if time zone is specified
if (dateFormat.StartsWith("'-") && (timeFormat.IndexOfAny(new[] { 'z', 'Z' }) != -1))
continue;
dt.Add(dateFormat + "'T'" + timeFormat);
}
}
return dt;
}
}
Iso8601Formats.DateAndOrTime 静态属性可能是此类中最有用的。使用代码：
DateTimeOffset.ParseExact("1985-04-12T10:22:00Z", Iso8601Formats.DateAndOrTime, CultureInfo.InvariantCulture, DateTimeStyles.None);
我能够解析以下ISO 8601日期/时间：
19850412
1985-04
1985
--0412
---12
1985-04-12
T102205
T1022
T10
T-2207
T--07
T102200Z
T102200-08
T102200-0830
T10:22:05
T10:22
T10
T-:22:07
T-:-:07
T10:22:00Z
T10:22:00-08
T10:22:00-0830
19850412T102205
19850412T1022
19850412T10
19850412T-2207
19850412T--07
19850412T102200Z
19850412T102200-08
19850412T102200-0830
1985-04T102205
1985-04T1022
1985-04T10
1985-04T-2207
1985-04T--07
1985-04T102200Z
1985-04T102200-08
1985-04T102200-0830
1985T102205
1985T1022
1985T10
1985T-2207
1985T--07
1985T102200Z
1985T102200-08
1985T102200-0830
--0412T102205
--0412T1022
--0412T10
--0412T-2207
--0412T--07
---12T102205
---12T1022
---12T10
---12T-2207
---12T--07
1985-04-12T10:22:05
1985-04-12T10:22
1985-04-12T10
1985-04-12T-:22:07
1985-04-12T-:-:07
1985-04-12T10:22:00Z
1985-04-12T10:22:00-08
1985-04-12T10:22:00-0830
但是，此类仍然无法使用指定的时区和年份缺席来解析日期/时间，例如：
--0412T102200Z
--0412T102200-08
--0412T102200-0830