First you have to define the event interface.
首先你得定义事件接口。
The event channel deals with event hierarchies by determining the most specific subtype of the event interface subscribed by an event receiver.
事件通道通过确定事件接收者订阅的事件接口的最具体的子类型，来处理事件层次结构。
The event interface is not needed.
事件接口不需要选择。
Events must be declared in the event interface.
事件必须在事件接口中声明。
The source object does not expose '0' event interface.
源对象不公开“0”事件接口。
Gets the class that implements the methods of the event interface.
获取实现事件接口的方法的类。
When a source interface is imported from a type library, any methods it implements are added as events to a generated event interface.
当从类型库导入源接口时，它实现的所有方法都将作为事件添加到所生成的事件接口中。
When a source interface is imported from a type library, any methods it implements are added as events to a generated event interface.
当从类型库导入源接口时，它实现的所有方法都将作为事件添加到所生成的事件接口中。
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