问题描述
我有一个这样的字符串:250920111414
I have a string like this: 250920111414
我想从该字符串创建一个 DateTime 对象.截至目前，我使用子字符串并这样做:
I want to create a DateTime object from that string. As of now, I use substring and do it like this:
string date = 250920111414;
int year = Convert.ToInt32(date.Substring(4, 4));
int month = Convert.ToInt32(date.Substring(2, 2));
...
DateTime dt = new DateTime(year, month, day ...);
是否可以使用字符串格式，做同样的事情，没有子字符串?
Is it possible to use string format, to do the same, without substring?
推荐答案
当然.从您的字符串猜测格式，您可以使用 ParseExact
Absolutely. Guessing the format from your string, you can use ParseExact
string format = "ddMMyyyyHHmm";
DateTime dt = DateTime.ParseExact(value, format, CultureInfo.InvariantCulture);
或TryParseExact:
DateTime dt;
bool success = DateTime.TryParseExact(value, format,
CultureInfo.InvariantCulture, DateTimeStyles.None, out dt);
后一个调用将在解析失败时简单地返回 false，而不是抛出异常 - 如果您可能有不应该导致整个任务失败的错误数据(例如，它是用户输入，并且你只是想提示他们)那么这是一个更好的调用.
The latter call will simply return false on parse failure, instead of throwing an exception - if you may have bad data which shouldn't cause the overall task to fail (e.g. it's user input, and you just want to prompt them) then this is a better call to use.
有关格式字符串详细信息的更多详细信息，请参阅 "自定义日期和MSDN 中的时间格式字符串".
For more details about the format string details, see "Custom Date and Time Format Strings" in MSDN.
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