I've changed my application to use OAuth, and things seem to be working fine. However, I know my OAuth access token will eventually expire. I was looking for a straightforward way to check to ensure my access token is still valid (like AuthCheckToken,
but for OAuth).
The Flickr API seems to have a flickr.auth.oauth.checkToken method (http://www.flickr.com/services/api/flickr.auth.oauth.checkToken.html), but I could not find a corresponding function in flickr.net (maybe I'm just missing it).
When I call the flickr API method directly with an invalid token, I get what I'd expect:
<?xml version="1.0" encoding="utf-8" ?>
<err code="98" msg="Invalid token" />