如何知道DateTime是否在C＃中的DateRange之间

Question

我需要知道Date是否在DateRange之间。我有三个日期：

// The date range

DateTime startDate;

DateTime endDate;

DateTime dateToCheck;

简单的解决方案是进行比较，但是有更聪明的方法吗？

提前致谢。

Answer 1

不，做一个简单的比较对我来说很好看：return dateToCheck >= startDate && dateToCheck < endDate;值得考虑的事情：DateTime在时区方面有点奇怪。它可能是UTC，它可能是“本地的”，它可能是模棱两可的。确保你将苹果与苹果进行比较。考虑您的起点和终点应该是包容性的还是排他性的。我已经将上面的代码视为包含下限和独占上限。

Answer 2

通常我会为这些事情创建Fowler's Range实现。public interface IRange<T>{&nbsp; &nbsp; T Start { get; }&nbsp; &nbsp; T End { get; }&nbsp; &nbsp; bool Includes(T value);&nbsp; &nbsp; bool Includes(IRange<T> range);}public class DateRange : IRange<DateTime>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;{&nbsp; &nbsp; public DateRange(DateTime start, DateTime end)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; Start = start;&nbsp; &nbsp; &nbsp; &nbsp; End = end;&nbsp; &nbsp; }&nbsp; &nbsp; public DateTime Start { get; private set; }&nbsp; &nbsp; public DateTime End { get; private set; }&nbsp; &nbsp; public bool Includes(DateTime value)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; return (Start <= value) && (value <= End);&nbsp; &nbsp; }&nbsp; &nbsp; public bool Includes(IRange<DateTime> range)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; return (Start <= range.Start) && (range.End <= End);&nbsp; &nbsp; }}用法非常简单：DateRange range = new DateRange(startDate, endDate);range.Includes(date)

Answer 3

您可以使用扩展方法使其更具可读性：public static class DateTimeExtensions{&nbsp; &nbsp; public static bool InRange(this DateTime dateToCheck, DateTime startDate, DateTime endDate)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; return dateToCheck >= startDate && dateToCheck < endDate;&nbsp; &nbsp; }}现在你可以写：dateToCheck.InRange(startDate, endDate)