The ruling on a husband saying: “I divorce you if you do such-and-such,” intending to prevent it

Question:
He says: Honorable Shaykh, may Allah grant you success. If a man says to his wife, “I divorce you if you do such-and-such,” and then she does what he swore about, some scholars rule that he owes an expiation for the oath, as if he were in the position of one who has sworn an oath. Is that the case? If his intention was to prevent it, this is a matter of disagreement among the scholars, yes.

Answer:
As for when his intention was not to prevent it, but only to make the divorce conditional, then the divorce takes place, yes.