Gets or sets a collection of additional attributes beyond the strongly typed properties that are defined for the 类定义的强类型属性（ property ）以外，获取或设置附加属性（ attribute ）的集合。
However , individual controls might require specialized style classes that provide additional properties specific to the control 但是，个别控件可能需要一些专用样式类，以提供特定于控件的附加属性。
And for additional properties and methods that enable the user to interact directly with servers using http 中定义的属性和方法提供支持，也对使用户能够直接与使用http的服务器交互的附加属性和方法提供支持。
In addition to the standard unicode character properties , the following additional properties may be specified as part of a character set 除标准unicode字符属性外，还可以指定下列附加属性作为字符集的一部分。
Element is selected for a control , each of these additional attributes is used to override the corresponding property of the containing control 元素时，这些附加属性中的每项属性都用于重写包含控件的相应属性。
Depending on client support , when a mouse hovers over a hyperlink that has the additional attribute set , a tooltip is displayed 根据客户端支持，在将鼠标悬停在设置了附加属性的超链接上时，将显示相应的工具提示。
Other data types , such as function pointers , arrays , and structures , require additional attributes to ensure proper data marshaling 其他数据类型（如函数指针、数组和结构）需要一些附加属性以确保进行正确的数据封送处理。
Collection is typically used when you need to apply additional attributes to a site map node , but do not want to derive a custom class in order to do so 集合通常用于以下情形：您需要将附加属性应用于站点地图节点，但又不希望为此派生一个自定义类。
Modify a unique constraint when you want to change the columns that the constraint is attached to , change the constraint name , or set additional properties for the constraint 当想要更改约束所附加到的列、更改约束名称或设置约束的附加属性时，可修改唯一约束。
By convention , custom attribute classes should have names ending with " attribute . " when attaching the attribute , users of the attribute may omit the " attribute " suffix 按照约定，自定义属性类的名称应该以“ attribute ”结尾。附加属性时，属性的用户可以省略“ attribute ”后缀。
