Why doesn't ODP.NET 11 xcopy deployment work on a machine with Oracle DB 10 installed?

Question

I have an app that uses a local version of ODAC 11 below the directory that the .exe file is in. The idea is that we want our app to use the local ODAC 11 regardless of wha

Answer 1

So as I understand it, the issue was that while Oracle.DataAccess.dll was in the same directory as the app, it could not find its lower-level homies (oci, et al), hence the compatibility error.

Turns out that if you want an application to work with ODAC 11 xcopy deployment regardless of what else the user may have installed on her machine, you need to do 2 things:

1. Set the PATH environment variable for the process. (I was already doing this.)

2. Set the ORACLE_HOME environment variable for the process. (I was not doing this.)

   Environment.SetEnvironmentVariable("PATH", Environment.CurrentDirectory + "\\oracle\\11.1\\odac;" + Environment.CurrentDirectory + "\\oracle\\11.1\\odac\\bin;", EnvironmentVariableTarget.Process);
   Environment.SetEnvironmentVariable("ORACLE_HOME", Environment.CurrentDirectory + "\\oracle\\11.1\\odac", EnvironmentVariableTarget.Process);
   

EDIT: It's also important to note that Oracle will throw this error not just for environmental issues, but also if one of the files is missing on the target machine. I got this same error on other machines despite the Environment settings because I had Subversion set to ignore directories called "bin", so the OraOps DLL was not being copied to the client.