Convert byte array from Oracle RAW to System.Guid?

Question

My app interacts with both Oracle and SQL Server databases using a custom data access layer written in ADO.NET using DataReaders. Right now I\'m having a problem with the c

Answer 1

It turns out that the issue was the byte order you get in Guid.ToByteArray() and not Oracle itself. If you take the Guid "11223344-5566-7788-9900-aabbccddeeff" and call ToByteArray() on it, you get "44332211665588779900AABBCCDDEEFF". If you then pass that byte array back into the constructor for Guid, you get the original Guid. My mistake was trying to query the Oracle database by the original Guid format (with the dashes removed) instead of the result of the ToByteArray() call.

I still have no idea why the bytes are ordered that way, but it apparently has nothing to do with Oracle.