This class must have a single public property called Value of the same data type as the Const variables you created for this enumeration in step 2.

此类必须具有一个称为Value的公共属性，与第2步中为此枚举创建的Const变量具有相同的数据类型。

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Create a global list with a data type equal to the enumeration name and with a name of Enum_ followed by the enumeration name (in our case, Enum_BookType).

创建一个全局列表，使其数据类型等同于枚举名称，且名称以enum _开头，后接枚举名称(在本例中为Enum_BookType)。

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Represented by the DataControlRowType enumeration, the type of the row indicates the position and the role (for example, footer, header, pager, and data row).

行类型由datacontrolrowtype枚举表示，用来指示位置和角色(例如，页脚、页眉、页导航和数据行)。

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