注意：只有一个可信上下文对象可以与主要授权ID关联。
Note: Only one trusted context object can be associated with a primary authorization ID.
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.
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.
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.
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