DateTime.Parse不会根据线程文化反转月和日 [英] DateTime.Parse not reversing month and day based on thread culture

问题描述

我正在从数据库中解析日期字符串，以便我可以在UI线程的当前文化中显示它。由于某种原因，日期并不解析文化 - 具体来说，我正在解析一个美国日期，切换到es-ES日期，而月/日位置不切换。

根据这个MSDN文章我应该只能使用Parse，只有日期字符串作为参数。我也应该能够明确提供一个文化对象。无论是工作还是我的日期都保持为mm / dd，而不是dd / mm。我已经验证了线程的CurrentCulture和CurrentUICulture都设置正确，如果我做了一个新的DateTime，那么输出正确。

我错过了什么？

编辑：没有什么奇怪的代码，只是.NET API。

  CultureInfo culture = CultureInfo.CreateSpecificCulture（cultureName）; 
 Thread.CurrentThread.CurrentCulture =文化; 
 Thread.CurrentThread.CurrentUICulture =文化; 
 DateTime formattedDate = DateTime.Parse（5/9/2014）; 
 formattedDate.ToShortDateString（）; // this return 5/9/2014 
 DateTime.Today.ToShortDateString（）; //返回9/5/2014 
  

解决方案

问题你所拥有的是，5/9/2014是一个完全有效的月份字符串，以dd / mm / yyyy或mm / dd / yyyy格式，所以当你做 DateTime.Parse（5/9/2014 ）它将成功解析为2014年9月5日（由于es-es日期格式为dd / mm / yyyy）。

然后解释为什么当你输出你得到的东西不同于 DateTime.Today （这显然是5月9日）。

您的程序的工作版本将是：

  var outputCulture = CultureInfo.CreateSpecificCulture（es-es）; 
 var inputCulture = CultureInfo.CreateSpecificCulture（en-us）; 
 Thread.CurrentThread.CurrentCulture = outputCulture; 
 Thread.CurrentThread.CurrentUICulture = outputCulture; 
 DateTime formattedDate = DateTime.Parse（5/9/2014，inputCulture）; 
 Console.WriteLine（formattedDate.ToShortDateString（））; // this returns 09/05/2014 
 Console.WriteLine（DateTime.Today.ToShortDateString（））; //这返回09/05/2014 
  

正如你所看到的，我指定输入的文化，它知道使用en-us文化，而不是明确设定es文化解析。

I'm parsing a date string from a database so that I can display it in the current culture of the UI thread. For some reason, the date is not parsing with respect to the culture - specifically, I'm parsing a en-US date to switch to a es-ES date and the month/day positions are not switching.

According to this MSDN article I should just be able to use Parse with only the date string as a parameter. I should also be able to explicitly provide a culture object. Neither works and my date remains as mm/dd instead of dd/mm. I've verified that both the thread's CurrentCulture and CurrentUICulture are set properly and if I do a new DateTime, that outputs correctly.

Am I missing something?

EDIT: Nothing fancy in the code, just the .NET API.

CultureInfo culture = CultureInfo.CreateSpecificCulture(cultureName);
Thread.CurrentThread.CurrentCulture = culture;
Thread.CurrentThread.CurrentUICulture = culture;
DateTime formattedDate = DateTime.Parse("5/9/2014");
formattedDate.ToShortDateString(); //this returns 5/9/2014
DateTime.Today.ToShortDateString(); //this returns 9/5/2014

解决方案

The problem you are having is that 5/9/2014 is a perfectly valid month string in either dd/mm/yyyy or mm/dd/yyyy format so when you do DateTime.Parse("5/9/2014") it will successfully parse it as 5th September 2014 (since the es-es date format is dd/mm/yyyy).

This then explains why when you output you get something different to DateTime.Today (which is obviously 9th May).

A working version of your program would be:

var outputCulture = CultureInfo.CreateSpecificCulture("es-es");
var inputCulture = CultureInfo.CreateSpecificCulture("en-us");
Thread.CurrentThread.CurrentCulture = outputCulture;
Thread.CurrentThread.CurrentUICulture = outputCulture;
DateTime formattedDate = DateTime.Parse("5/9/2014", inputCulture);
Console.WriteLine(formattedDate.ToShortDateString()); //this returns 09/05/2014
Console.WriteLine(DateTime.Today.ToShortDateString()); //this returns 09/05/2014

As you see I am specifying the culture for input so that it knows to use the en-us culture rather than the explicitly set es-es culture for parsing.

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