The event interface is not needed.
事件接口不需要选择。
First you have to define the event interface.
首先你得定义事件接口。
Any custom event class must implement the XMLEvent interface.
任何定制事件类必须实现XMLEvent接口。
The payload of each event is a data interface between the two widgets.
每个事件的负载是两个小部件之间的数据接口。
The interface for a simple event channel is shown in Listing 2.
简单事件通道的接口如清单2所示。
That event is the sole member of the INotifyPropertyChanged interface.
该事件是INotifyPropertyChanged接口的唯一成员。
When a default route was assigned to the new interface, a default-route-up event would result.
当为这个新接口分配一个默认路由时，会生成一个default - route - up事件。
Please choose the event class that implements the interface you chose in the previous step.
选择实现上一步所选接口的事件类。
When implementing this interface, raise this event before changing the current item.
在实现此接口时，会在更改当前项之前引发此事件。
The class event name and the interface method name must be the same.
类事件的名称和接口方法的名称必须相同。
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。
An interface can declare an event.
接口可声明事件。
An interface can declare an event.
接口可声明事件。
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