为什么不能将其识别为有效的日期时间? [英] Why is this not recognized as a valid datetime?

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问题描述

我有以下代码行:

  DateTime dt1 = DateTime.ParseExact( 2017/04 / 09 2:44 PM, yyyy / MM / dd h:mm tt,System.Globalization.CultureInfo.InvariantCulture); 

您可以看到日期时间和格式匹配(至少看起来匹配),但是转换时仍然出现错误:


字符串未被识别为有效的DateTime。



解决方案

不确定使用它的位置,但是输入中有一些不可见的unicode字符。尝试复制粘贴此方法,它将起作用:

  DateTime dt1 = DateTime.ParseExact( 2017/04/09 2: 44 PM, yyyy / MM / dd h:mm tt,System.Globalization.CultureInfo.InvariantCulture); 

进一步挖掘,在/和0之间有一个 E2 80 8E,另一个在2. 根据unicode表 ,这是从左到右的标记。



一种可行的方法是删除您不希望看到的所有字符:

  var input = 2017/04/09 2:44 PM; 

var sanitizedInput = Regex.Replace(input,@ [^ \w:/],string.Empty);

DateTime dt1 = DateTime.ParseExact(sanitizedInput, yyyy / MM / dd h:mm tt,System.Globalization.CultureInfo.InvariantCulture);


I have the following line of code:

DateTime dt1 = DateTime.ParseExact("‎2017/‎04/‎09 ‏‎2:44 PM", "yyyy/MM/dd h:mm tt", System.Globalization.CultureInfo.InvariantCulture);  

As you can see the datetime and the format matches (well at least it appears to match), yet I still get an error when converting:

String was not recognized as a valid DateTime.

解决方案

Not sure where you took it, but there are a few invisible unicode characters in your input. Try copy-pasting this and it'll work:

DateTime dt1 = DateTime.ParseExact("2017/04/09 2:44 PM", "yyyy/MM/dd h:mm tt", System.Globalization.CultureInfo.InvariantCulture);  

Digging further, there is a "E2 80 8E" between / and 0, and another one just before the 2. According to the unicode table, this is "left-to-right mark".

One way to make it work is to remove all the characters you don't expect to see:

var input = "‎2017/‎04/‎09 ‏‎2:44 PM";

var sanitizedInput = Regex.Replace(input, @"[^\w:/ ]", string.Empty);

DateTime dt1 = DateTime.ParseExact(sanitizedInput, "yyyy/MM/dd h:mm tt", System.Globalization.CultureInfo.InvariantCulture);

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