blocks|key|280660|text|在示例中，我们创建了两个datetime对象，一个具有当前时间，另一个在当前时间基础上添加了75秒。然后，我们将对第二个DateTime对象调用方法.Subtract()。这将返回一个TimeSpan对象。一旦我们获得了TimeSpan对象，我们就可以使用TimeSpan的属性来获得实际的小时、分钟和秒。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|280661|DateTime+startTime+=+DateTime.Now;

+DateTime+endTime+=+DateTime.Now.AddSeconds(+75+);

+TimeSpan+span+=+endTime.Subtract+(+startTime+);
+Console.WriteLine(+"Time+Difference+(seconds):+"+%2B+span.Seconds+);
+Console.WriteLine(+"Time+Difference+(minutes):+"+%2B+span.Minutes+);
+Console.WriteLine(+"Time+Difference+(hours):+"+%2B+span.Hours+);
+Console.WriteLine(+"Time+Difference+(days):+"+%2B+span.Days+);|code-block|syntax|javascript|280662|结果：|280663|Time+Difference+(seconds):+15
Time+Difference+(minutes):+1
Time+Difference+(hours):+0
Time+Difference+(days):+0|280664|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In the sample, we are creating two datetime objects, one with current time and another one with 75 seconds added to the current time. Then we will call the method .Subtract() on the second DateTime object. This will return a TimeSpan object.
Once we get the TimeSpan object, we can use the properties of TimeSpan to get the actual Hours, Minutes and Seconds.

<pre><code>DateTime startTime = DateTime.Now;

 DateTime endTime = DateTime.Now.AddSeconds( 75 );

 TimeSpan span = endTime.Subtract ( startTime );
 Console.WriteLine( "Time Difference (seconds): " + span.Seconds );
 Console.WriteLine( "Time Difference (minutes): " + span.Minutes );
 Console.WriteLine( "Time Difference (hours): " + span.Hours );
 Console.WriteLine( "Time Difference (days): " + span.Days );
</code></pre>

Result:

<pre><code>Time Difference (seconds): 15
Time Difference (minutes): 1
Time Difference (hours): 0
Time Difference (days): 0
</code></pre>

blocks|key|3204692|text|你使用Nullable有什么原因吗？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3204693|如果你想使用Nullable，那么你可以编写variable.Value.TotalHours。|3204694|或者你可以直接写：(datevalue1+-+datevalue2).TotalHours。|3204695|entityMap^0|3|8|0|6|8|M|P|0|9|10|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|K|$]]

Is there a reason you're using <code>Nullable</code>?

If you want to use <code>Nullable</code> then you can write <code>variable.Value.TotalHours</code>.

Or you can just write: <code>(datevalue1 - datevalue2).TotalHours</code>.

blocks|key|3204706|text|我认为你很困惑，因为你没有声明一个TimeSpan，你声明了一个TimeSpan?，也就是一个nullable+TimeSpan。如果您不需要问号可以为空，则删除问号，或者使用variable.Value.TotalHours。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3204707|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/1t3y8s4s(v=vs.80).aspx^0|H|8|W|9|1K|8|2G|P|1B|8|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

I think you're confused because you haven't declared a <code>TimeSpan</code> you've declared a <code>TimeSpan?</code> which is a <a href="http://msdn.microsoft.com/en-us/library/1t3y8s4s(v=vs.80).aspx" rel="noreferrer">nullable</a> <code>TimeSpan</code>. Either remove the question mark if you don't need it to be nullable or use <code>variable.Value.TotalHours</code>.

blocks|key|3204709|text|您可能还希望查看|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3204710|var+hours+=+(datevalue1+-+datevalue2).TotalHours;|code-block|syntax|javascript|3204711|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you may also want to look at 

<pre><code>var hours = (datevalue1 - datevalue2).TotalHours;
</code></pre>

blocks|key|3204715|text|这是在C#中减去两个日期的另一个例子...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3204716|if+(+DateTime.Now.Subtract(Convert.ToDateTime(objDateValueFromDatabase.CreatedOn)).TotalHours+>+24+)+
{+
...+
}+|code-block|syntax|javascript|3204717|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is another example of subtracting two dates in C# ...

<pre><code>if ( DateTime.Now.Subtract(Convert.ToDateTime(objDateValueFromDatabase.CreatedOn)).TotalHours &gt; 24 ) 
{ 
... 
} 
</code></pre>

blocks|key|2991080|text|var+startTime+=+new+TimeSpan(6,+0,+0);+//+6:00+AM
var+endTime+=+new+TimeSpan(5,+30,+0);+//+5:30+AM+
var+hours24+=+new+TimeSpan(24,+0,+0);
var+difference+=+endTime.Subtract(startTime);+//+(-00:30:00)
difference+=+(difference.Duration()+!=+difference)+?+hours24.Subtract(difference.Duration())+:+difference;+//+(23:30:00)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2991081|如果我们比较两个不同的日期，还可以添加日期之间的差异|unstyled|2991082|new+TimeSpan(24+*+days,+0,+0)|2991083|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>var startTime = new TimeSpan(6, 0, 0); // 6:00 AM
var endTime = new TimeSpan(5, 30, 0); // 5:30 AM 
var hours24 = new TimeSpan(24, 0, 0);
var difference = endTime.Subtract(startTime); // (-00:30:00)
difference = (difference.Duration() != difference) ? hours24.Subtract(difference.Duration()) : difference; // (23:30:00)
</code></pre>

can also add difference between the dates if we compare two different dates 

<pre><code>new TimeSpan(24 * days, 0, 0)
</code></pre>

blocks|key|284349|text|为员工支付工时或其他精度要求提供更精确的方式：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|284350|decimal+DeterminePreciseHours(DateTime+startTimestamp,+DateTime+stopTimestamp)
{
++++var+span+=+(stopTimestamp+-+startTimestamp).Value;
++++decimal+total+=+(decimal)span.TotalMilliseconds+/+60+/+60+/+1000;
++++return+Math.Round(total,+PRECISION_CONSTANT);
}|code-block|syntax|javascript|284351|https://dotnetfiddle.net/tVIoVJ|284352|entityMap|0|LINK|mutability|MUTABLE|url^0|K|3|0|0|0|V|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|W|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|X|8|@]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|M|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|L]]]]

a more precise way for employee paid hours or other precision requirement::

<pre><code>decimal DeterminePreciseHours(DateTime startTimestamp, DateTime stopTimestamp)
{
 var span = (stopTimestamp - startTimestamp).Value;
 decimal total = (decimal)span.TotalMilliseconds / 60 / 60 / 1000;
 return Math.Round(total, PRECISION_CONSTANT);
}
</code></pre>

<a href="https://dotnetfiddle.net/tVIoVJ" rel="nofollow noreferrer">https://dotnetfiddle.net/tVIoVJ</a>

blocks|key|284354|text|哇，我得说:保持简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|284355|MessageBox.Show("Result:+"+%2B+(DateTime.Now.AddDays(10)+>+DateTime.Now));

Result:+True|code-block|syntax|javascript|284356|和：|284357|MessageBox.Show("Result:+"+%2B+DateTime.Now.AddDays(10).Subtract(DateTime.Now));

Result:+10.00:00:00|284358|DateTime对象拥有处理布尔结果的所有内置逻辑。|284359|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

WOW, I gotta say: keep it simple:

<pre><code>MessageBox.Show("Result: " + (DateTime.Now.AddDays(10) &gt; DateTime.Now));

Result: True
</code></pre>

and:

<pre><code>MessageBox.Show("Result: " + DateTime.Now.AddDays(10).Subtract(DateTime.Now));

Result: 10.00:00:00
</code></pre>

The DateTime object has all the builtin logic to handle the Boolean result.

I am retrieving two date time values from the database. Once the value is retrieved, I need the difference between the two values.
For that, I create a timespan variable to store the difference of the 2 date values.

<pre><code>TimeSpan? variable = datevalue1 - datevalue2;
</code></pre>

Now i need to show the difference which is stored in the Timespan variable in terms of number of hours.
I referred to <a href="http://msdn.microsoft.com/en-us/library/system.timespan.totalhours.aspx">TimeSpan.TotalHours</a> but couldn't apply the same for some reason.
How do I do that?
I am using C# on a MVC project. I simple need to show the difference value in hours?

EDIT:
Since timespan was nullable, i couldn't use the total hours property. Now I can use it by doing TimeSpanVal.Value.TotalHours;

Showing Difference between two datetime values in hours

数据库

我正在从数据库中检索两个日期时间值。一旦检索到值，我就需要这两个值之间的差异。为此，我创建了一个timespan变量来存储两个日期值的差值。TimeSpan? variable = datevalue1 - datevalue2;现在，我需要显示以小时数存储在Timespan变量中的差异。我提到了，但由于某些原因无法应...

问以小时为单位显示两个日期时间值之间的差异
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