We use an interception mechanism to get in the way of calls going to that member, collect a list of policies that apply using a matching rules mechanism, run the chain of handlers specified by those policies in a chain of responsibility and at the other end dispatch the call to the target. Once the target is done - successfully or with exceptions - the stack unwinds, returning through each handler and finally back to the caller.
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It's kind of a shame that Microsoft couldn't bring themselves to use AOP terminology to describe this: weaving instead of "injection" ... etc. It would really have made it easier to follow for the new users and would have lent some validation to AOP research and development