blocks|key|3061843|text|使用Math.Round并指定小数位数。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3061844|Math.Round(pay,2);|code-block|syntax|javascript|3061845|Math.Round+Method+(Double,+Int32)|3061846|3061847|将双精度浮点值舍入到指定的小数位数。|blockquote|style|BOLD|3061848|3061849|3061850|或Math.Round+Method+(Decimal,+Int32)|3061851|3061852|将十进制值四舍五入到指定的小数位数。|3061853|3061854|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/75ks3aby.aspx|1|2|http://msdn.microsoft.com/en-us/library/zy06z30k.aspx^0|2|A|0|0|0|0|X|1|0|0|1|5|0|0|0|1|Y|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|D|3|E|5|F|7|1D|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|1E|8|@]|9|@$A|1F|B|1G|1|1H]]|C|$]]|$1|K|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]|$1|L|3|M|5|N|7|1J|8|@$A|1K|B|1L|O|P]]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1M|8|@]|9|@]|C|$]]|$1|R|3|-4|5|6|7|1N|8|@]|9|@]|C|$]]|$1|S|3|T|5|6|7|1O|8|@]|9|@$A|1P|B|1Q|1|1R]]|C|$]]|$1|U|3|-4|5|6|7|1S|8|@]|9|@]|C|$]]|$1|V|3|W|5|N|7|1T|8|@]|9|@]|C|$]]|$1|X|3|-4|5|6|7|1U|8|@]|9|@]|C|$]]|$1|Y|3|-4|5|6|7|1V|8|@]|9|@]|C|$]]]|Z|$10|$5|11|12|13|C|$14|15]]|16|$5|11|12|13|C|$14|15]]|17|$5|11|12|13|C|$14|18]]]]

Use <a href="http://msdn.microsoft.com/en-us/library/75ks3aby.aspx" rel="noreferrer">Math.Round</a> and specify the number of decimal places. 

<pre><code>Math.Round(pay,2);
</code></pre>

<a href="http://msdn.microsoft.com/en-us/library/75ks3aby.aspx" rel="noreferrer">Math.Round Method (Double, Int32)</a>

<blockquote>
 Rounds a double-precision floating-point value to a specified number
 of fractional digits.
</blockquote>

Or <a href="http://msdn.microsoft.com/en-us/library/zy06z30k.aspx" rel="noreferrer">Math.Round Method (Decimal, Int32)</a>

<blockquote>
 Rounds a decimal value to a specified number of fractional digits.
</blockquote>

blocks|key|2589624|text|您应该使用Math.Round的一种形式。请注意，除非您指定MidpointRounding值，否则Math.Round默认为银行家舍入(舍入到最接近的偶数)。如果你不想使用四舍五入，你应该使用Math.Round(decimal+d,+int+decimals,+MidpointRounding+mode)，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2589625|Math.Round(pay,+2,+MidpointRounding.AwayFromZero);+//+.005+rounds+up+to+0.01
Math.Round(pay,+2,+MidpointRounding.ToEven);+++++++//+.005+rounds+to+nearest+even+(0.00)+
Math.Round(pay,+2);++++//+Defaults+to+MidpointRounding.ToEven|code-block|syntax|javascript|2589626|(Why+does+.NET+use+banker's+rounding?)|2589627|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/as4h66hd.aspx|1|http://msdn.microsoft.com/en-us/library/system.midpointrounding.aspx|2|http://msdn.microsoft.com/en-us/library/ms131274.aspx|3|https://stackoverflow.com/questions/311696/why-does-net-use-bankers-rounding-as-default^0|5|A|U|G|1E|A|2P|1M|5|A|0|U|G|1|2P|1M|2|0|0|1|10|3|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@$9|19|A|1A|1|1B]|$9|1C|A|1D|1|1E]|$9|1F|A|1G|1|1H]]|E|$]]|$1|F|3|G|5|H|7|1I|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|M|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]|W|$5|P|Q|R|E|$S|X]]|Y|$5|P|Q|R|E|$S|Z]]]]

You should use a form of <a href="http://msdn.microsoft.com/en-us/library/as4h66hd.aspx" rel="noreferrer"><code>Math.Round</code></a>. Be aware that <code>Math.Round</code> defaults to banker's rounding (rounding to the nearest even number) unless you specify a <a href="http://msdn.microsoft.com/en-us/library/system.midpointrounding.aspx" rel="noreferrer"><code>MidpointRounding</code></a> value. If you don't want to use banker's rounding, you should use <a href="http://msdn.microsoft.com/en-us/library/ms131274.aspx" rel="noreferrer"><code>Math.Round(decimal d, int decimals, MidpointRounding mode)</code></a>, like so:
<pre><code>Math.Round(pay, 2, MidpointRounding.AwayFromZero); // .005 rounds up to 0.01
Math.Round(pay, 2, MidpointRounding.ToEven); // .005 rounds to nearest even (0.00) 
Math.Round(pay, 2); // Defaults to MidpointRounding.ToEven
</code></pre>
(<a href="https://stackoverflow.com/questions/311696/why-does-net-use-bankers-rounding-as-default">Why does .NET use banker's rounding?</a>)

blocks|key|3061858|text|decimal+pay++=+1.994444M;

Math.Round(pay+,+2);+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3061859|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>decimal pay = 1.994444M;

Math.Round(pay , 2); 
</code></pre>

blocks|key|3061887|text|您可以舍入结果并使用string.Format设置精度，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3061888|decimal+pay+=+200.5555m;
pay+=+Math.Round(pay+%2B+bonus,+2);
string+payAsString+=+string.Format("{0:0.00}",+pay);|code-block|syntax|javascript|3061889|entityMap^0|A|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You can round the result and use <code>string.Format</code> to set the precision like this:

<pre><code>decimal pay = 200.5555m;
pay = Math.Round(pay + bonus, 2);
string payAsString = string.Format("{0:0.00}", pay);
</code></pre>

blocks|key|4791163|text|使用System.Math.Round将十进制值舍入为指定的小数位数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4791164|var+pay+=+200+%2B+bonus;
pay+=+System.Math.Round(pay,+2);
Console.WriteLine(pay);|code-block|syntax|javascript|4791165|MSDN参考：|4791166|4791167|http://msdn.microsoft.com/en-us/library/system.math.round.aspx|unordered-list-item|offset|length|4791168|http://msdn.microsoft.com/en-us/library/zy06z30k.aspx|4791169|4791170|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|0|0|1Q|0|0|0|1H|1|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|11|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@$M|14|N|15|1|16]]|A|$]]|$1|O|3|P|5|L|7|17|8|@]|9|@$M|18|N|19|1|1A]]|A|$]]|$1|Q|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|K]]|Y|$5|U|V|W|A|$X|P]]]]

Use System.Math.Round to rounds a decimal value to a specified number of fractional digits.

<pre><code>var pay = 200 + bonus;
pay = System.Math.Round(pay, 2);
Console.WriteLine(pay);
</code></pre>

MSDN References:

<ul>
<li><a href="http://msdn.microsoft.com/en-us/library/system.math.round.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.math.round.aspx</a></li>
<li><a href="http://msdn.microsoft.com/en-us/library/zy06z30k.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/zy06z30k.aspx</a></li>
</ul>

blocks|key|3062055|text|确保您提供了一个数字，通常使用双精度。Math.Round可以接受1-3个参数，第一个参数是要舍入的变量，第二个参数是小数位数，第三个参数是舍入类型。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3062056|double+pay+=+200+%2B+bonus;
double+pay+=+Math.Round(pay);
//+Rounds+to+nearest+even+number,+rounding+0.5+will+round+"down"+to+zero+because+zero+is+even
double+pay+=+Math.Round(pay,+2,+MidpointRounding.ToEven);
//+Rounds+up+to+nearest+number
double+pay+=+Math.Round(pay,+2,+MidpointRounding.AwayFromZero);|code-block|syntax|javascript|3062057|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|$]]

Make sure you provide a number, typically a double is used. Math.Round can take 1-3 arguments, the first argument is the variable you wish to round, the second is the number of decimal places and the third is the type of rounding.

<pre><code>double pay = 200 + bonus;
double pay = Math.Round(pay);
// Rounds to nearest even number, rounding 0.5 will round "down" to zero because zero is even
double pay = Math.Round(pay, 2, MidpointRounding.ToEven);
// Rounds up to nearest number
double pay = Math.Round(pay, 2, MidpointRounding.AwayFromZero);
</code></pre>

blocks|key|2591226|text|请注意Round+遍历的事实。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|2591227|所以(我不知道这在你的行业里是否重要)，但是：|2591228|float+a+=+12.345f;
Math.Round(a,2);

//result:12,35,+and+NOT+12.34+!|code-block|syntax|javascript|2591229|为了更准确地描述您的情况，我们可以这样做：|2591230|int+aInt+=+(int)(a*100);
float+aFloat=+aInt+/100.0f;
//result:12,34+|2591231|entityMap^0|3|5|9|2|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|Y|8|@]|E|@]|F|$]]|$1|I|3|J|5|K|7|Z|8|@]|E|@]|F|$L|M]]|$1|N|3|O|5|6|7|10|8|@]|E|@]|F|$]]|$1|P|3|Q|5|K|7|11|8|@]|E|@]|F|$L|M]]|$1|R|3|-4|5|6|7|12|8|@]|E|@]|F|$]]]|S|$]]

Pay attention on fact that <code>Round</code> rounds.

So (I don't know if it matters in your industry or not), but: 

<pre><code>float a = 12.345f;
Math.Round(a,2);

//result:12,35, and NOT 12.34 !
</code></pre>

To make it more precise for your case we can do something like this: 

<pre><code>int aInt = (int)(a*100);
float aFloat= aInt /100.0f;
//result:12,34 
</code></pre>

blocks|key|4703203|text|Console.WriteLine(decimal.Round(pay,2));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4703204|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Console.WriteLine(decimal.Round(pay,2));
</code></pre>

I am interested in how to round variables to two decimal places. In the example below, the bonus is usually a number with four decimal places. Is there any way to ensure the pay variable is always rounded to two decimal places?

<pre><code> pay = 200 + bonus;
 Console.WriteLine(pay);
</code></pre>

Rounding a variable to two decimal places C#

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我感兴趣的是如何将变量四舍五入到小数点后两位。在下面的示例中，奖金通常是一个有四个小数位的数字。有没有办法确保pay变量总是四舍五入到小数点后两位？  pay = 200 + bonus;  Console.WriteLine(pay);

问将变量舍入到小数点后两位C#
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问将变量舍入到小数点后两位C#
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