The EditPart also observes the model, and updates the view to reflect changes in the model's state.
EditPart还观察模型并更新视图，以反映模型状态中的变化。
If the server side state of a portal resource that was once required to generate the markup for a specific page changes, this page needs to be regenerated, and thus the cached view becomes invalid.
如果曾用于生成特定页面的标记的某个门户资源的服务器端状态发生更改，需要重新生成此页面，因而缓存的视图会变为无效。
Gets a value that indicates whether the node is saving changes to its view state.
获取一个值，该值指示节点是否保存其视图状态更改。
Gets a value that indicates whether the node is saving changes to its view state.
获取一个值，该值指示节点是否保存其视图状态更改。
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