摘要：
The IViewObject interface enables an object to display itself directly without passing a data object to the caller. In addition, this interface can create and manage a connection with an advise sink so the caller can be notified of changes in the view object.
The caller can request specific representations and specific target devices. For example, a caller can ask for either an object's content or an iconic representation. Also, the caller can ask the object to compose a pict 阅读全文
