How do I break an integer into its component bytes?

Raymond Chen


Warning: .NET content ahead.
For some reason, this gets asked a lot.

To break an integer into its component bytes, you can use

the BitConverter.GetBytes method

int i = 123456;
byte[] bytes = BitConverter.GetBytes(i);

After this code fragment, the byte array contains
{ 0x40, 0xE2, 0x01, 0x00 }.

Update 11am:
The endian-ness of the result is determined by

BitConverter.IsLittleEndian property
Thanks to reader Sean McVey for pointing this out.


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