How to write super-fast file-streaming code in C#?

Question

I have to split a huge file into many smaller files. Each of the destination files is defined by an offset and length as the number of bytes. I\'m using the following code:<

Answer 1

(For future reference.)

Quite possibly the fastest way to do this would be to use memory mapped files (so primarily copying memory, and the OS handling the file reads/writes via its paging/memory management).

Memory Mapped files are supported in managed code in .NET 4.0.

But as noted, you need to profile, and expect to switch to native code for maximum performance.