BitConverter VS ToString for Hex

Question

Just wondering if someone could explain why the two following lines of code return "different" results? What causes the reversed values? Is this something to do with endianness?

int.MaxValue.ToString("X") //Result: 7FFFFFFF
BitConverter.ToString(BitConverter.GetBytes(int.MaxValue)) //Result: FF-FF-FF-7F

score 13 · Accepted Answer · answered May 24 '11 at 07:49

int.MaxValue.ToString("X") outputs 7FFFFFFF, that is, the number 2147483647 as a whole.

On the other hand, BitConverter.GetBytes returns an array of bytes representing 2147483647 in memory. On your machine, this number is stored in little-endian (highest byte last). And BitConverter.ToString operates separately on each byte, therefore not reordering output to give the same as above, thus preserving the memory order.

However the two values are the same : 7F-FF-FF-FF for int.MaxValue, in big-endian, and FF-FF-FF-7F for BitConverter, in little-endian. Same number.

Awesome detailed answer. Thank you – Maxim Gershkovich May 24 '11 at 07:53 — Maxim Gershkovich, May 24 '11 at 07:53

score -1 · Answer 2 · answered May 24 '11 at 07:33

-1

I would guess because GetBytes returns an array of bytes which BitConverter.ToString formatted - in my opinion - rather nicely

And also keep in mind that the bitwise represantattion may be different from the value! This depends where the most signigicant byte sits!

hth

answered May 24 '11 at 07:33

Mario The Spoon

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yeah, sorry, I had only ony coffe till now. I updated my answer - binary represantation and value are/ may be different. – Mario The Spoon May 24 '11 at 07:35

BitConverter VS ToString for Hex

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