编辑上下文每次只能有一个关联的设计器视图。
An editing context can have only one designer view associated with it at a time.
会话上下文在实例的生命周期内保持与实例关联。
The session context remains associated with the instance for the lifetime of the instance.
会话上下文在实例的生命周期内保持与实例关联。
The session context remains associated with the instance for the lifetime of the instance.
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