Buffer.BlockCopy vs unsafe byte* pointer copy

Question

which one has better performance when copy a block of byte?

Answer 1

Buffer.BlockCopy is pretty optimised - it is basically a wrapper over a raw mem-copy; so it should be pretty fast (and avoids messing with pointers and unsafe code). It should be the default. You could of course measure it each way...

Answer 2

Handling of Large Byte Arrays at http://www.codeproject.com/KB/dotnet/Large_Byte_Array_handling.aspx documents performance versus various methods, include the methods in your question.