将外接程序连接到扩展性对象模型。
此类提供的属性和事件可用于访问宿主应用程序的对象模型以及在加载和关闭外接程序时运行代码。
This class provides properties and events you can use to access the object model of the host application and run code when the add-in is loaded and shut down.
您可以使用此类的成员在加载或卸载外接程序时运行代码、访问宿主应用程序的对象模型，以及扩展应用程序的功能。
You can use members of this class to run code when the add-in is loaded or unloaded, to access the object model of the host application, and to extend features of the application.
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