Subclasses must override this method to perform any tracing around the supplied IMethodInvocation.
The result of the call to IMethodInvocation.Proceed()
By default, the passed-in ILog instance will have log level "trace" enabled. Subclasses do not have to check for this again, unless they overwrite the IsInterceptorEnabled method to modify the default behavior.
|Exception||If any of the interceptors in the chain or the target object itself throws an exception.|