从奇怪的格式解析 c# 中的日期时间
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Parse DateTime in c# from strange format
提问by Grant
if i have a datetime string in a weird format, such as YYYY##MM##DD HH**M**SS, how can i create a new datetime object base on that? i have read something about the datetimeformatinfoclass but not sure how to get it working..
如果我有一个奇怪格式的日期时间字符串，例如YYYY##MM##DD HH**M**SS，我如何基于它创建一个新的日期时间对象？我已经阅读了一些关于 datetimeformatinfoclass 的内容，但不知道如何让它工作..
采纳答案by Jon Skeet
You can use DateTime.ParseExact, or DateTime.TryParseExact for data which you're not confident in. For example:
您可以将 DateTime.ParseExact 或 DateTime.TryParseExact 用于您不确定的数据。例如：
using System;
class Test
{
static void Main()
{
string formatString = "yyyy'##'MM'##'dd' 'HH'*'mm'*'ss";
string sampleData = "2010##02##10 07*22*15";
Console.WriteLine(DateTime.ParseExact(sampleData,
formatString,
null));
}
}
The quotes in the format string aren't strictly necessary - this will work too:
格式字符串中的引号不是绝对必要的 - 这也可以：
string formatString = "yyyy##MM##dd HH*mm*ss";
However, using the quotes means you're being explicit that the characters between the quotes are to be used literally, and not understood as pattern characters - so if you changed "#" to "/" the version using quotes would definitely use "/" whereas the version without would use a culture-specific value.
但是，使用引号意味着您明确表示引号之间的字符将按字面使用，而不是理解为模式字符 - 因此，如果您将“#”更改为“/”，则使用引号的版本肯定会使用“/ " 而没有的版本将使用特定于文化的值。
The nullin the call to ParseExactmeans "use the current culture" - in this case it's unlikely to make much difference, but a commonly useful alternative is CultureInfo.InvariantCulture.
将null在调用ParseExact表示“使用目前的文化” -在这种情况下，它不会带来多大的改变，但是一个常用有用的替代是CultureInfo.InvariantCulture。
It's unfortunate that there's no way of getting the BCL to parse the format string and retain the information; my own Noda Timeproject rectifies this situation, and I'm hoping it'll make parsing and formatting a lot faster - but it's far from production-ready at the moment.
不幸的是，没有办法让 BCL 解析格式字符串并保留信息；我自己的Noda Time项目纠正了这种情况，我希望它能让解析和格式化的速度更快——但目前还远未准备好生产。
回答by Giorgi
You can use DateTime.ParseExactmethod and pass the format you need.
您可以使用DateTime.ParseExact方法并传递您需要的格式。
