C＃DateTime ToString标准区域性格式 [英] C# DateTime ToString Standard culture format

问题描述

我可以为特定区域性更改DateTime的标准输出格式吗？示例：

Can I alter the standard output format of a DateTime for a specific culture. Example:

class Program
{
    static void Main(string[] args)
    {
        PrintCultureDateTime("ca-ES");
        PrintCultureDateTime("es-ES");
        PrintCultureDateTime("en-US");
        PrintCultureDateTime("en-GB");
        PrintCultureDateTime("pt-PT");
    }

    public static void PrintCultureDateTime(string culture)
    {
        string result = new DateTime(2017, 10, 1).ToString("d", 
            CultureInfo.GetCultureInfo(culture));
        Console.WriteLine(string.Format("{0}: {1}", culture, result));
    }
}

输出：

ca-ES: 1/10/2017
es-ES: 01/10/2017
en-US: 10/1/2017
en-GB: 01/10/2017
pt-PT: 01/10/2017

我想要的是使用标准的 d格式或其他标准的格式在日期和月份中使用两位数字，以便固定DateTime字符串的大小。类似于这样的输出：

What I want is to use two digits for day and month using standard "d" format or another standartd one, in order to fix the size of DateTime strings . Something like that output:

ca-ES: 01/10/2017
es-ES: 01/10/2017
en-US: 10/01/2017
en-GB: 01/10/2017
pt-PT: 01/10/2017

推荐答案

基于@Jon Skeet的答案我已经实现了以下解决方案。我认为必须存在一次迭代的更好的正则表达式替换指令，但我没有更多时间来找到它。

Basing on @Jon Skeet answer I've implemented the following solution. I think that a better regular expression replacement instruction with a single iteration must exist but I've no more time to find it.

它不适用于格式'Year：'yyyy'; Month：'MM';'Day：'dd，但我将假设为错误。

It didn't works on format "'Year:' yyyy '; Month: ' MM '; 'Day: 'dd" but I' ll assume the "error".

    public static void PrintCultureDateTime(string culture)
    {
        string result = new DateTime(2017, 10, 1).ToString(FixedSizeShortDatePattern(culture));
        Console.WriteLine(string.Format("{0}: {1}", culture, result));
    }

    public static string FixedSizeShortDatePattern(string culture)
    {
        var cultureInfo = CultureInfo.GetCultureInfo(culture);
        string format = cultureInfo.DateTimeFormat.ShortDatePattern;
        return ReplaceSingleChar(ReplaceSingleChar(format, 'd'), 'M');
    }

    public static string ReplaceSingleChar(string input, char c)
    {
        string cStr = c.ToString();
        string strRegex = string.Format(@"^({0})[^{0}]|[^{0}]({0})[^{0}]|[^{0}]({0})$", cStr);
        return Regex.Replace(input, strRegex, (match) =>
        {
            string token = match.Groups[0].Value;
            if (!string.IsNullOrEmpty(token))
            {
                return match.Value.Replace(cStr, string.Concat(cStr, cStr));
            }
            return token;
        });
    }

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