An object that has already been wrapped is implementing the interface.
已被包装的对象正在实现接口。
When implementing this interface, raise this event after the current item has been changed.
在实现此接口时，会在更改当前项之后引发此事件。
When implementing this interface, raise this event after the current item has been changed.
在实现此接口时，会在更改当前项之后引发此事件。
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