C＃两个日期之间的天数问题 [英] C# Number of days between two dates problem

问题描述

下面的代码有一个小问题，无论天数相隔多远， days变量始终看起来为0。

I have a small problem with the code below, the 'days' variable always seems to be 0 no matter how far apart the days are.

有什么明显的错误吗？

Can you see anything obviously wrong?

        System.TimeSpan span = dates[0] - dates[1]; // e.g. 12/04/2010 11:44:08 and 18/05/2010 11:52:19
        int days = (int)span.TotalDays;

        if (days > 10) //days always seems to be 0
        {
            throw new Exception("Over 10 days");
        }

谢谢

推荐答案

当您从较早的日期中减去较晚的日期时，根据您的评论，TotalDays将为负数。在您的示例中为-36。

As you are subtracting the later date from the earlier date, according to your comments, TotalDays will be negative. In your example, -36.

因此，（天数> 10）的比较将失败。您应该使用

Therefore a comparison of (days > 10) will fail. You should use

int days = Math.Abs((int)span.TotalDays);

假设您未将date [0]设置为等于date [1]，则没有理由为什么TotalDays对于您的注释中的样本日期将返回零。

Assuming you haven't set date[0] equal to date[1], there is no reason why TotalDays will be returning zero for the sample dates you have in your comments.

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