Ensure that the garbage collector does not reclaim the delegate before the callback function completes its work.

确保在回调函数完成其工作之前，垃圾回收器不会回收委托。

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Ensure that the garbage collector does not reclaim the delegate before the callback function completes its work.

确保在回调函数完成其工作之前，垃圾回收器不会回收委托。

youdao