我们在产品中遇到了一个错误，原因是对于某些文化，如果您将当前线程的文化设置为该文化，然后输出基于 RFC1123 格式的 DateTime 的字符串，然后尝试将其转换回一个日期时间，它失败了。最令人头疼的失败来自许多将星期几翻译成以 mar 开头的词的文化，例如意大利语中的 martedi。我假设解析例程看到“mar”并认为这意味着英语中的 March 并且一切都失败了，但这只是猜测。我所知道的准确描述我正在谈论的内容的最好方法是提供代码:
using System;
using System.Globalization;
using System.Threading;
namespace RFC1123Test
{
class Program
{
static void Main(string[] args)
{
//list taken from http://msdn.microsoft.com/en-us/library/system.globalization.cultureinfo(v=vs.71).aspx
var culturesToTest = new string[] { String.Empty /*invariant culture*/, "af", "af-ZA",
"sq", "sq-AL", "ar", "ar-DZ", "ar-BH", "ar-EG", "ar-IQ", "ar-JO", "ar-KW",
"ar-LB", "ar-LY", "ar-MA", "ar-OM", "ar-QA", "ar-SA", "ar-SY", "ar-TN",
"ar-AE", "ar-YE", "hy", "hy-AM", "az", "az-AZ-Cyrl", "az-AZ-Latn", "eu", "eu-ES",
"be", "be-BY", "bg", "bg-BG", "ca", "ca-ES", "zh-HK", "zh-MO", "zh-CN", "zh-CHS",
"zh-SG", "zh-TW", "zh-CHT", "hr", "hr-HR", "cs", "cs-CZ", "da", "da-DK", "div",
"div-MV", "nl", "nl-BE", "nl-NL", "en", "en-AU", "en-BZ", "en-CA", "en-CB",
"en-IE", "en-JM", "en-NZ", "en-PH", "en-ZA", "en-TT", "en-GB", "en-US", "en-ZW",
"et", "et-EE", "fo", "fo-FO", "fa", "fa-IR", "fi", "fi-FI", "fr", "fr-BE", "fr-CA",
"fr-FR", "fr-LU", "fr-MC", "fr-CH", "gl", "gl-ES", "ka", "ka-GE", "de", "de-AT",
"de-DE", "de-LI", "de-LU", "de-CH", "el", "el-GR", "gu", "gu-IN", "he", "he-IL",
"hi", "hi-IN", "hu", "hu-HU", "is", "is-IS", "id", "id-ID", "it", "it-IT",
"it-CH", "ja", "ja-JP", "kn", "kn-IN", "kk", "kk-KZ", "kok", "kok-IN", "ko",
"ko-KR", "ky", "ky-KZ", "lv", "lv-LV", "lt", "lt-LT", "mk", "mk-MK", "ms",
"ms-BN", "ms-MY", "mr", "mr-IN", "mn", "mn-MN", "no", "nb-NO", "nn-NO", "pl",
"pl-PL", "pt", "pt-BR", "pt-PT", "pa", "pa-IN", "ro", "ro-RO", "ru", "ru-RU",
"sa", "sa-IN", "sr-SP-Cyrl", "sr-SP-Latn", "sk", "sk-SK", "sl", "sl-SI", "es",
"es-AR", "es-BO", "es-CL", "es-CO", "es-CR", "es-DO", "es-EC", "es-SV", "es-GT",
"es-HN", "es-MX", "es-NI", "es-PA", "es-PY", "es-PE", "es-PR", "es-ES", "es-UY",
"es-VE", "sw", "sw-KE", "sv", "sv-FI", "sv-SE", "syr", "syr-SY", "ta", "ta-IN",
"tt", "tt-RU", "te", "te-IN", "th", "th-TH", "tr", "tr-TR", "uk", "uk-UA", "ur",
"ur-PK", "uz", "uz-UZ-Cyrl", "uz-UZ-Latn", "vi", "vi-VN" };
//2:30 PM local time
var timeOfDayForTest = TimeSpan.FromHours(14).Add(TimeSpan.FromMinutes(30));
CultureInfo cultureForTest = null;
foreach (var culture in culturesToTest)
{
bool suitableForTest = true;
try
{
cultureForTest = new CultureInfo(culture);
Thread.CurrentThread.CurrentCulture = cultureForTest;
Thread.CurrentThread.CurrentUICulture = cultureForTest;
}
catch
{
suitableForTest = false;
}
if (suitableForTest)
{
//be sure to do a date for every day of the week
for (int i = 0; i < 7; i++)
{
runTest(cultureForTest, DateTime.Now.Date.Add(timeOfDayForTest).AddDays(i));
}
}
}
}
private static void runTest(CultureInfo culture, DateTime dt)
{
//string representation of RFC1123 pattern
string rfc1123Date = dt.ToUniversalTime().ToString(CultureInfo.CurrentCulture.DateTimeFormat.RFC1123Pattern);
bool parseFails = false;
DateTime parsedDt = DateTime.MinValue;
try
{
parsedDt = Convert.ToDateTime(rfc1123Date);
}
catch
{
parseFails = true;
}
if (parseFails)
{
Console.WriteLine(String.Format("ERROR: {0} [{1}] parse failed for [{2}].",
culture.Name, culture.NativeName, rfc1123Date));
}
else
{
if (parsedDt.Ticks == dt.Ticks)
{
//success!
//Console.WriteLine(String.Format("SUCCESS: {0} [{1}] worked just fine for {2}.",
//culture.Name, culture.NativeName, rfc1123Date));
}
else
{
Console.WriteLine(String.Format("ERROR: {0} [{1}] parsed successfully for {2} but parsed date does not match.",
culture.Name, culture.NativeName, rfc1123Date));
}
}
}
}
}
输出是这样的:
ERROR: af-ZA [Afrikaans (Suid Afrika)] parse failed for [Dins, 12 Jul 2011 18:30:00 GMT].
ERROR: af-ZA [Afrikaans (Suid Afrika)] parse failed for [Woen, 13 Jul 2011 18:30:00 GMT].
ERROR: af-ZA [Afrikaans (Suid Afrika)] parse failed for [Dond, 14 Jul 2011 18:30:00 GMT].
ERROR: af-ZA [Afrikaans (Suid Afrika)] parse failed for [Vry, 15 Jul 2011 18:30:00 GMT].
ERROR: af-ZA [Afrikaans (Suid Afrika)] parse failed for [Sat, 16 Jul 2011 18:30:00 GMT].
ERROR: af-ZA [Afrikaans (Suid Afrika)] parse failed for [Son, 17 Jul 2011 18:30:00 GMT].
ERROR: af-ZA [Afrikaans (Suid Afrika)] parse failed for [Maan, 18 Jul 2011 18:30:00 GMT].
ERROR: sq-AL [shqipe (Shqip‰ria)] parse failed for [Mar, 12 Kor 2011 18:30:00 GMT].
ERROR: sq-AL [shqipe (Shqip‰ria)] parse failed for [Sht, 16 Kor 2011 18:30:00 GMT].
ERROR: gl-ES [galego (galego)] parse failed for [mar, 12 xull 2011 18:30:00 GMT].
ERROR: it-IT [italiano (Italia)] parse failed for [mar, 12 lug 2011 18:30:00 GMT].
ERROR: it-CH [italiano (Svizzera)] parse failed for [mar, 12 lug 2011 18:30:00 GMT].
ERROR: it-CH [italiano (Svizzera)] parse failed for [gio, 14 lug 2011 18:30:00 GMT].
ERROR: ja-JP [??? (??)] parse failed for [?, 12 7 2011 18:30:00 GMT].
ERROR: ja-JP [??? (??)] parse failed for [?, 13 7 2011 18:30:00 GMT].
ERROR: ja-JP [??? (??)] parse failed for [?, 14 7 2011 18:30:00 GMT].
ERROR: ja-JP [??? (??)] parse failed for [?, 15 7 2011 18:30:00 GMT].
ERROR: ja-JP [??? (??)] parse failed for [?, 16 7 2011 18:30:00 GMT].
ERROR: ja-JP [??? (??)] parse failed for [?, 17 7 2011 18:30:00 GMT].
ERROR: ja-JP [??? (??)] parse failed for [?, 18 7 2011 18:30:00 GMT].
ERROR: ko-KR [??? (????)] parse failed for [?, 12 7 2011 18:30:00 GMT].
ERROR: ko-KR [??? (????)] parse failed for [?, 13 7 2011 18:30:00 GMT].
ERROR: ko-KR [??? (????)] parse failed for [?, 14 7 2011 18:30:00 GMT].
ERROR: ko-KR [??? (????)] parse failed for [?, 15 7 2011 18:30:00 GMT].
ERROR: ko-KR [??? (????)] parse failed for [?, 16 7 2011 18:30:00 GMT].
ERROR: ko-KR [??? (????)] parse failed for [?, 17 7 2011 18:30:00 GMT].
ERROR: ko-KR [??? (????)] parse failed for [?, 18 7 2011 18:30:00 GMT].
ERROR: es-AR [Espa¤ol (Argentina)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-BO [Espa¤ol (Bolivia)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-CL [Espa¤ol (Chile)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-CO [Espa¤ol (Colombia)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-CR [Espa¤ol (Costa Rica)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-DO [Espa¤ol (Rep£blica Dominicana)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-EC [Espa¤ol (Ecuador)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-SV [Espa¤ol (El Salvador)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-GT [Espa¤ol (Guatemala)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-HN [Espa¤ol (Honduras)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-MX [Espa¤ol (M‚xico)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-NI [Espa¤ol (Nicaragua)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-PA [Espa¤ol (Panam )] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-PY [Espa¤ol (Paraguay)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-PE [Espa¤ol (Per£)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-PR [Espa¤ol (Puerto Rico)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-ES [espa¤ol (Espa¤a)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-UY [Espa¤ol (Uruguay)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
ERROR: es-VE [Espa¤ol (Republica Bolivariana de Venezuela)] parse failed for [mar, 12 jul 2011 18:30:00 GMT].
所以我的问题是，为什么这段代码不起作用？
最佳答案
尝试将 DateTime.ParseExact 与您用于生成文本日期的格式提供程序一起使用:
DateTime.ParseExact(rfc1123Date, CultureInfo.CurrentCulture.DateTimeFormat.RFC1123Pattern, CultureInfo.CurrentCulture).ToLocalTime()
关于c# - 在 C# 中使用 RFC-1123 日期格式，解析星期二日期的问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6668766/