The weak event pattern can also be used whenever the object lifetime of the source exceeds the useful object lifetime of the listener.
当源的对象生存期超出侦听器的有用对象生存期时，也可以使用弱事件模式。
The weak event pattern can also be used whenever the object lifetime of the source exceeds the useful object lifetime of the listener.
当源的对象生存期超出侦听器的有用对象生存期时，也可以使用弱事件模式。
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