This class represents a list of checkboxes that can be selected in
any combination. Though this class is generated out of individual
checkboxes, it acts like an integrated list. For example, ASP.NET
will add or remove checkbox items as needed when you bind it to a
data source. You can use RepeatDirection to
specify how checkboxes will be grouped together if
RepeatColumns is greater than 1. For example, if
you set RepeatDirection to
RepeatDirection.Vertical, and
RepeatColumns to 2, the first two list items will
be displayed in the first columns, the next two will be displayed on
the second column, and so on. If you set
RepeatDirection to
RepeatDirection.Horizontal, your list will still
have the same number of rows and columns, but checkbox items will be
filled first by column, and then by row.
Individual checkboxes are grouped together automatically in an HTML
table, which you can fine-tune with the
CellPadding and CellSpacing
properties. Alternatively, you can set
RepeatLayout to
RepeatLayout.Flow to specify that an HTML table
should not be used.
Most of the list-specific functionality, such as determining the
selected item and reacting to a
SelectedIndexChanged event, is provided by the
ListControl class, which
CheckBoxList inherits from. To determine what
items are checked in a checkbox list, iterate through the
Items collection and test the
ListItem.Selected property of each item in the
list.
public class CheckBoxList : ListControl, IRepeatInfoUser, System.Web.UI.INamingContainer,
System.Web.UI.IPostBackDataHandler {
// Public Constructors
public CheckBoxList( );
// Public Instance Properties
public virtual int CellPadding{set; get; }
public virtual int CellSpacing{set; get; }
public virtual int RepeatColumns{set; get; }
public virtual RepeatDirection RepeatDirection{set; get; }
public virtual RepeatLayout RepeatLayout{set; get; }
public virtual TextAlign TextAlign{set; get; }
// Protected Instance Methods
protected override Style CreateControlStyle( ); // overrides WebControl
protected override Control FindControl(string id, int pathOffset); // overrides System.Web.UI.Control
protected override void OnPreRender(EventArgs e); // overrides ListControl
protected override void Render(System.Web.UI.HtmlTextWriter writer); // overrides WebControl
}
System.Web.UI.Control(System.ComponentModel.IComponent,
System.IDisposable,
System.Web.UI.IParserAccessor,
System.Web.UI.IDataBindingsAccessor)