blocks|key|1494271|text|不，.NET+<=+3.5中没有任何内容。我希望/期待BigInteger在.NET+4.0中回归。(它是cut+from+.NET+3.5。)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1494272|entityMap|0|LINK|mutability|MUTABLE|url|http://blogs.msdn.com/bclteam/archive/2007/01/16/introducing-system-numeric-biginteger-inbar-gazit.aspx|1|http://blogs.msdn.com/bclteam/archive/2008/01/04/where-did-biginteger-go-melitta-andersen.aspx^0|R|A|0|1H|H|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

No, there's nothing in .NET &lt;= 3.5. I'm hoping/expecting that <a href="http://blogs.msdn.com/bclteam/archive/2007/01/16/introducing-system-numeric-biginteger-inbar-gazit.aspx" rel="noreferrer">BigInteger</a> will make its return in .NET 4.0. (It was <a href="http://blogs.msdn.com/bclteam/archive/2008/01/04/where-did-biginteger-go-melitta-andersen.aspx" rel="noreferrer">cut from .NET 3.5</a>.)

blocks|key|1494340|text|我相信Mono有一个BigInteger实现，你应该能够找到它的源码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1494341|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I believe Mono has a BigInteger implementation that you should be able to track down the source for.

blocks|key|1494408|text|如果您不介意引用J#库(vjslib.dll默认包含在VS中)，那么在.NET中已经有了BigInteger的实现|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1494409|using+java.math;

public+static+void+Main(){
++++BigInteger+biggy+=+new+BigInteger(....)

}|code-block|syntax|javascript|1494410|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|$]]

If you don't mind making reference to the J# library (vjslib.dll included with VS by default) there is already and implementation of BigInteger in .NET

<pre><code>using java.math;

public static void Main(){
 BigInteger biggy = new BigInteger(....)

}
</code></pre>

blocks|key|1709547|text|BigInteger现在是C#和.NET+4.0中的朋友的标准部分。请参阅：Gunnar+Peipman's+ASP.NET+blog注意，CPU通常可以在固定时间内更快地处理普通整数，特别是在使用常用的数学运算符(%2B，-，/，...)时。因为这些运算符通常直接映射到单个CPU指令。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1709548|使用BigInteger，即使是最基本的数学操作也是对方法的函数调用，这些方法的运行时间随数字的大小而变化。这是因为BigInteger实现了任意精度的算术运算，这增加了大量但必要的开销。好处是BigIntegers不限于64位甚至128位，而是由可用的系统内存(或大约2%5E64位的精度，以先到者为准)限制。阅读here。|1709549|entityMap|0|LINK|mutability|MUTABLE|url|http://weblogs.asp.net/gunnarpeipman/archive/2009/05/23/net-framework-4-0-introducing-biginteger.aspx|1|https://msdn.microsoft.com/en-us/library/system.numerics.biginteger(v=vs.110).aspx)^0|12|T|0|0|4C|4|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

BigInteger is now a standard part of C# and friends in .NET 4.0. See:<a href="http://weblogs.asp.net/gunnarpeipman/archive/2009/05/23/net-framework-4-0-introducing-biginteger.aspx" rel="nofollow noreferrer">Gunnar Peipman's ASP.NET blog</a>.
Note that the CPU can generally work with ordinary integers much more quickly and in constant time, especially when using the usual math operators (+, -, /, ...) because these operators typically map directly to single CPU instructions.
With BigInteger, even the most basic math operations are much slower function calls to methods whose runtime varies with the size of the number. This is because BigInteger implements arbitrary precision arithmetic, which adds considerable but necessary overhead.
The benefit is that BigIntegers are not limited to 64 or even 128 bits, but by available system memory (or about 2^64 bits of precision, whichever comes first).
Read <a href="https://msdn.microsoft.com/en-us/library/system.numerics.biginteger(v=vs.110).aspx" rel="nofollow noreferrer">here</a>.

blocks|key|1494480|text|用于Int128和Int256等大数计算的C#+PCL库。https://github.com/everbytes/BigMath|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1494481|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/everbytes/BigMath^0|T|10|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

C# PCL library for computations with big numbers such as Int128 and Int256.
<a href="https://github.com/everbytes/BigMath" rel="nofollow noreferrer">https://github.com/everbytes/BigMath</a>

blocks|key|1494579|text|在.NET框架中，GUID由128位整数支持；尽管它没有提供任何典型的整数类型方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1494580|我以前为GUID编写了一个处理程序，将其作为128位整数处理，但这是在我8年前工作的一家公司。我不再有权接触到源代码了。|1494581|因此，如果您需要对128位整数的本机支持，并且不想因为任何原因而依赖BigInteger，那么您可能可以通过修改GUID来实现您的目的。|1494582|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

GUID is backed by a 128 bit integer in .NET framework; though it doesn't come with any of the typical integer type methods.

I've written a handler for GUID before to treat it as a 128 bit integer, but this was for a company I worked for ~8 years ago. I no longer have access to the source code.

So if you need native support for a 128 bit integer, and don't want to rely on BigInteger for whatever reason, you could probably hack GUID to server your purposes.

I need to do some large integer math. Are there any classes or structs out there that represent a 128-bit integer and implement all of the usual operators?

BTW, I realize that decimal can be used to represent a 96-bit int.

Int128 in .Net?

我需要做一些大整数运算。有没有什么类或结构可以表示128位整数并实现所有常用的运算符？顺便说一句，我意识到decimal可以用来表示一个96位的int。

问.Net中的Int128？
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