I'm trying to isolate the oracle-client to the application by xcopying the instantclient and setting environment-variables for ORACLE_HOME and PATH in global.asax.cs as described here and here, but still get [OracleException (0x80004005): The provider is not compatible with the version of Oracle client] when running on the server. Is there some way to programmatically check client and provider to give a more descriptive error-message?
EDIT This post has a start. It lists three causes for the error.
I did a blog post on this very thing. I used it in our DAL to prevent connections to non supported versions of Oracle.
Use the managed oracle-client which is available now, then this question is irrelevant.
来源：https://stackoverflow.com/questions/5581752/program-defensively-against-odac-instantclient