If the control is linked to a database and the text length is to be accepted from the field definition of the database, you must not enter the text length here. The settings are only accepted from the database if the control property was not defined ( &quot; Not Defined &quot; state).
如果这个控件字段与一个数据库相关联，并且要从该数据库的字段定义中套用文本长度，就不允许在这里规定文本长度。只有当控件字段的属性没有被定义（状态：未定义），才能从数据库中套用设置。