英文:
how to parse a string to DateTime in c#?
问题
我想从C#中的dt1（2023-01-01）中减去dt2（2023-12-31），但当我尝试调试代码时，它显示“System.FormatException：'字符串'2023-12-31 08:00:00'无法识别为有效的DateTime。'”
我的代码：
DateTime dt1 = DateTime.Parse("2023-01-01 08:00:00");
DateTime dt2 = DateTime.Parse("2023-12-31 08:00:00");
TimeSpan diff = dt2.Subtract(dt1);
Console.WriteLine(diff.ToString());
如何修复这个错误？
英文:
I want to subtract dt2 (2023-12-31) from dt1 (2023-01-01) in c#, but when i try to debug the codes it says " System.FormatException: 'String '2023-12-31 08:00:00' was not recognized as a valid DateTime.' "
my codes:
DateTime dt1 = DateTime.Parse("2023-01-01 08:00:00");
DateTime dt2 = DateTime.Parse("2023-12-31 08:00:00");
TimeSpan diff = dt2.Subtract(dt1);
Console.WriteLine(diff.ToString());
How i can fix this error?
答案1
得分: 6
你的问题与DateTime相减无关，而是在解析它们时发生异常。问题在于DateTime.Parse在没有传递其他信息时使用当前区域设置的信息（如日期分隔符）。看起来你来自伊朗，所以让我们复现这个异常：
System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("fa-IR");
DateTime dt2 = DateTime.Parse("2023-12-31 08:00:00");
修复的一种方法是传递CultureInfo.InvariantCulture：
DateTime dt1 = DateTime.Parse("2023-01-01 08:00:00", CultureInfo.InvariantCulture);
DateTime dt2 = DateTime.Parse("2023-12-31 08:00:00", CultureInfo.InvariantCulture);
英文:
Your issue is not about subtracting DateTimes but the exception happens when you parse them. The reason is that DateTime.Parse uses your current culture's information(like date-separator) when you don't pass another. It seems that you are from iran, so this lets reproduce the exception:
System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("fa-IR");
DateTime dt2 = DateTime.Parse("2023-12-31 08:00:00");
So one way to fix it is to pass CultureInfo.InvariantCulture:
DateTime dt1 = DateTime.Parse("2023-01-01 08:00:00", CultureInfo.InvariantCulture);
DateTime dt2 = DateTime.Parse("2023-12-31 08:00:00", CultureInfo.InvariantCulture);
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