Can a defendant who entered into a plea bargain avoid a more lenient sentence by appealing against his sentence?

though the trial court acted in excess of jurisdiction in reaching that figure, so long as the trial court did not lack fundamental jurisdiction. The rationale behind this policy is that defendants who have received the benefit of their bargain should not be allowed to trifle with the courts by attempting to better the bargain through the appellate process. [Citations.] . . . 'When a defendant maintains that the trial court's sentence violates rules which would have required the imposition of a more lenient sentence, yet the defendant avoided a potentially harsher sentence by entering into the plea bargain, it may be implied that the defendant waived any rights under such rules by choosing to accept the plea bargain.' " (People v. Hester (2000) 22 Cal.4th 290, 295 (Hester).)