Once the context object goes out of scope, which like a database connection should be very quickly, the data objects essentially become read-only.
就像数据库连接那样应该非常快，一旦该上下文对象超出范围，数据对象实质上就进入只读状态。
The type of report object you are working with will determine the scope of items you can add to the report object at once.
您所使用的报表对象的类型会决定您能一次添加到报表对象的项目范围。
If you identify the intended scope of each object, you might specify to automatically release objects at the end of the scope.
如果标识出每个对象的范围，就可以指定在这个范围结束时自动释放对象。
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