使用时间跨度限制时间内登录到网站C＃ASP.NET [英] C# ASP.NET using TimeSpan to restrict hours to log into a website

问题描述

所有，

当客户登录我的网站，我想显示多少时间剩余，直到日志中的链接超时。

When a customer logs into my website, I want to show how much time is remaining until the log in link times out.

使用C＃中的时间跨度结构，由于某种原因，我无法弄清楚如何做到这一点的任务：

Using the TimeSpan structure in C#, for some reason, I cannot figure out how to do this task:

TimeSpan diff = (DateTime.Now - orderDate   );

当在客户登录，我要拿出多少时间，他/她剩余可登录到其客户......你有3个小时33分，直到这个链接倍。 ......你有2个小时25分钟，直到此链接超时等。

When the customer logs in, I want to show the customer how much time he/she has remaining to log in... "you have 3 hours 33 minutes until this link times out." ... "You have 2 hours 25 minutes until this link times out" etc.

在4个小时命中，当客户登录时，我要他/她重定向到一个对不起...链接超时页。

Once 4 hours is hit, when the customer logs in, I am going to redirect him/her to a sorry... the link has timed out page.

因此​​，一些Psudo code可能是...

So some Psudo code might be...

if (diff.Hours >= 4)
{
response.redirect("log_in_timed_out.aspx");
}
else
{
lblTimeRemaining.Text = "You have " + diff.Hours + " hours and " + diff.Minutes + " minutes remaining until the link times out.";
}

这psudo code，使小时和分钟计数，而不是下降到0。所以我登录，它说你有1个小时33分，2个小时12分钟等，因为时间跨度是给我的两个日期之间的差异。我希望它倒计时到0，3个小时23分钟，2小时15分钟，1小时5分钟等。

This psudo code makes the hours and minutes count up instead of down to 0. So I log in and it says you have 1 hours 33 minutes, 2 hours 12 minutes, etc. because the TimeSpan is giving me the difference between the two dates. And I want it to count down to 0 such as 3 hours 23 minutes, 2 hours 15 minutes, 1 hour 5 minutes, etc.

我怎么能显示多少时间剩下给客户每次他/她登录使用的时间跨度结构，并将它倒计时为0时？

How can I show how much time is remaining to the customer each time he/she logs in using the TimeSpan structure and have it count down to 0?

感谢任何反馈。

推荐答案

我建议保持所有内部的DateTime S IN UTC ，只有转换为本地时间显示。所以我用 DateTime.UtcNow 而不是 DateTime.Now ，并假设 orderTime 是UTC为好。

I recommend keeping all internal DateTimes in UTC, and only convert to local times for display. So I use DateTime.UtcNow instead of DateTime.Now and assume orderTime is in UTC as well.

我第一次在计算该链接到期时间，然后还剩余多少时间再说吧。

I first compute the time at which the link expires, and then how much time remains until then.

DateTime expirationTime = orderTime.AddHours(4);
TimeSpan timeRemaining = expirationTime - DateTime.UtcNow;
if(timeRemaining<TimeSpan.Zero)
  Error("Expired");
else
  Write("Remaining {0} hours {1} minutes",timeRemaining.Hours, timeRemaining.Minutes);

为了更好的可测试性它可以不叫 DateTime.UtcNow / 。现在内联，但传递有用中的值。但因为我不知道你的周围code和建筑，我就用简单的方法。

For better testability it can be useful not to call DateTime.UtcNow/.Now inline, but to pass in the value. But since I don't know your surrounding code and architecture, I went with the simple approach.

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