使用DateTime.MinValue还是可空的DateTime最好？ [英] Is it better to use DateTime.MinValue or a nullable DateTime?

问题描述

如果我在一个名为TimeLastAccessed的类上有一个DateTime，那么这个DateTime可以变得更有意义：

If I had a DateTime on a class called "TimeLastAccessed", would it make more sense for this DateTime to be nullable:

public DateTime? TimeLastAccessed { get; set }

if (TimeLastAccessed == null) // ... handle it

表示它从未被访问或检查DateTime.MinValue

to indicate it has never been accessed or check for DateTime.MinValue

public DateTime TimeLastAccessed { get; set; }

if (TimeLastAccessed == DateTime.MinValue) // ... handle it

？

推荐答案

使用Nullable更有意义。这是Nullable的想法 - 表示值类型没有有效值。使用MinValue是一个修补程序，您没有Nullable的情况。

It makes more sense to use Nullable. That's the idea of Nullable - to express that a value type has no valid value. To use MinValue is a patch for cases you don't have Nullable.

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