求字符串"20070723122743",转为时间的最快方法

[songcan]

自己做了一个效率不高，字符串转为时间后对应为2007-7-23 12:27:43 ，谢谢！

[liulcster]

就这个呀
DateTime dt = DateTime.ParseExact("20070723122743", "yyyyMMddhhmmss", System.Globalization.CultureInfo.CurrentCulture);
挺好的!

[burn3tt]

DateTime.TryParse()
===
using System;
using System.Globalization;

namespace Parse
{
class Class1
{
public static void Main(string[] args)
{
// Assume the current culture is en-US.
// The date is Feburary 16, 1992, 12 hours, 15 minutes and 12 seconds.

string myDateTimeValue = "2/16/1992 12:15:12";
DateTime myDateTime = DateTime.Parse(myDateTimeValue);
Console.WriteLine("1) myDateTime = {0}", myDateTime);

// Reverse month and day to conform to a different culture.
// The date is Feburary 16, 1992, 12 hours, 15 minutes and 12 seconds.

IFormatProvider culture = new CultureInfo("fr-FR", true);
string myDateTimeFrenchValue = " 16/02/1992 12:15:12";
DateTime myDateTimeFrench =
DateTime.Parse(myDateTimeFrenchValue,
culture,
DateTimeStyles.NoCurrentDateDefault);
Console.WriteLine("2) myDateTimeFrench = {0}", myDateTimeFrench);

// The date is Feburary 16, 1992, 12 hours, 15 minutes and 12 seconds.

string[] expectedFormats = {"G", "g", "f" ,"F"};
myDateTimeFrench =
DateTime.ParseExact(myDateTimeFrenchValue,
expectedFormats,
culture,
DateTimeStyles.AllowWhiteSpaces);
Console.WriteLine("3) myDateTimeFrench = {0}", myDateTimeFrench);
}
}
}
/*
This example yields the following results:

1) myDateTime = 2/16/1992 12:15:12 PM
2) myDateTimeFrench = 2/16/1992 12:15:12 PM
3) myDateTimeFrench = 2/16/1992 12:15:12 PM
*/

[王集鹄]

string S = "20070723122743";
DateTime vDateTime = DateTime.ParseExact(S, "yyyyMMddHHmmss", null,
System.Globalization.DateTimeStyles.None);
Console.WriteLine(vDateTime);

[viena]

慢了，楼上正解~

[whb147]

同意,学习了

[heatol]

慢了,慢了,楼上楼上正解

[heatol]

又慢了

[viena]

不过有更简单的重载
string S = "20070723122743";
DateTime dt = DateTime.ParseExact(S, "yyyyMMddHHmmss", null);

[aSalt]

分了,分了,楼上正解

[bitpolar]

哎 更慢了
楼上楼上的楼上楼上正解

[shilei831115]

凑热闹 顺便接分若干

[Fan52027]

凑热闹，接分。

ps：lz不给我分，不厚道啊

[x719x]

何必乃,有必要去追求那点时间吗

[tepc2000]

up

[叶子海盗]

不错，学习了。

[hitspeed]

[Quote=引用 12 楼 的回复:]

何必乃,有必要去追求那点时间吗
[/Quote]

呵呵，你不知道楼主的应用场景就别乱说，最烦你这样的人

我现在给你一个场景，你说这点时间重要不重要：每分钟有数十M的文本文件要解析出来后入到数据库里，记录数大概上百万，每条记录都有几个日期时间信息要从字符串解析成时间格式，你说那点时间重要不重要？

如果每个字段解析性能差0.01毫秒，100万条记录每分钟，是多少？自己算吧