然而，如果您将一个宣告式安全性检查置于成员等级上，它只会套用至该成员，并覆写在类别等级上所指定的使用权限(如存在时)。

However, if you place a declarative security check at the member level, it applies to only that member and overrides the permission specified at the class level, if one exists.

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您可以使用宣告式语法将要求放在程序码的类别或方法等级。

You can use declarative syntax to place a demand at either the class or the method level of your code.

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在这个范例中，宣告式呼叫被直接放入类别定义之前，表示这个使用权限将被套用至该类别等级。

In this example, the declarative call is placed directly before the class definition, specifying that this permission be applied to the class level.

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