Int128 in .Net?

Question

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?

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Answer 1

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.