c# - 根据当前系统文化从字符串值构建 DateTime

Question

我需要的是使用字符串变量来构建基于当前系统文化的 DateTime。

一些例子说手动做

// date separator in german culture is "." (so "/" changes to ".")
String.Format("{0:d/M/yyyy HH:mm:ss}", dt); // "9/3/2008 16:05:07" - english (en-US)
String.Format("{0:d/M/yyyy HH:mm:ss}", dt); // "9.3.2008 16:05:07" - german (de-DE)

但是有没有办法自动做到这一点？

这段代码正确吗？

DateTime dateValue;
CultureInfo culture = CultureInfo.CurrentCulture;
DateTimeStyles styles = DateTimeStyles.None;
string strDateTime = string.Format("{0}/{1}/{2} {3}:{4}:{5}", systemTime.month, systemTime.day, systemTime.year, systemTime.hour, systemTime.minute, systemTime.second);
DateTime.TryParse(strDateTime, culture, styles, out dateValue);

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仅针对需要它的人，我将所有方法放在这里：

 DateTime dateValue;

        // Method 1
        //CultureInfo culture = CultureInfo.CurrentCulture;
        //DateTimeStyles styles = DateTimeStyles.None;
        //string strDateTime = string.Format("{0}/{1}/{2} {3}:{4}:{5}", systemTime.month, systemTime.day, systemTime.year, systemTime.hour, systemTime.minute, systemTime.second);
        //DateTime.TryParse(strDateTime, culture, styles, out dateValue);

        // Method 2
        //DateTime d = new DateTime(systemTime.year, systemTime.month, systemTime.day, systemTime.hour, systemTime.minute, systemTime.second);
        //dateValue = DateTime.Parse(d.ToString("G"));

        // Method 3 http://msdn.microsoft.com/en-us/library/ch92fbc1.aspx The string s is parsed using formatting information in the current DateTimeFormatInfo object, which is supplied implicitly by the current thread culture.
        DateTime d = new DateTime(systemTime.year, systemTime.month, systemTime.day, systemTime.hour, systemTime.minute, systemTime.second);
        DateTime.TryParse(d.ToString(), out dateValue);

Answer 1

您可以通过将"G"格式传递给自动使用当前文化ToString：

string result = dt.ToString("G"); // 9/3/2008 4:05:07 PM for en-US

这是一个演示。

Answer 2

当您使用DateTime.TryParse(string, out DateTime result)它时，它会自动使用当前的文化。请参阅此处的备注部分：http: //msdn.microsoft.com/en-us/library/ch92fbc1.aspx