Export (0) Print
Expand All

ListControlDataBindingHandler Class

Performs data binding of a ListControl Web server control within a visual designer.

Namespace: System.Web.UI.Design.WebControls
Assembly: System.Design (in system.design.dll)

public class ListControlDataBindingHandler : DataBindingHandler
public class ListControlDataBindingHandler extends DataBindingHandler
public class ListControlDataBindingHandler extends DataBindingHandler

The ListControlDataBindingHandler class performs design-time data binding of a ListControl control. The ListControlDataBindingHandler class is referenced by the ListControl using the DataBindingHandlerAttribute class.

The DataBindControl method performs the design-time data binding.

This section contains two code examples. The first one demonstrates how to derive a control from the RadioButtonList control and associate it with its data binding handler. The second one demonstrates how to the derive a class from the ListControlDataBindingHandler class.

The following code example shows how to derive the SimpleRadioButtonList control from the RadioButtonList control, and then apply the DataBindingHandlerAttribute attribute to associate the SimpleRadioButtonList control with its data binding handler, the SimpleRadioButtonListDataBindingHandler class.

using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Security.Permissions;

namespace Examples.CS.WebControls.Design
{
    // The SimpleRadioButtonList is a copy of the RadioButtonList.
    // It uses the SimpleRadioButtonListDesigner for design-time support.
    [AspNetHostingPermission(SecurityAction.Demand, 
        Level = AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, 
        Level = AspNetHostingPermissionLevel.Minimal)]
    [Designer(typeof(Examples.CS.WebControls.Design.
       SimpleRadioButtonListDesigner))]
    [DataBindingHandler(typeof(Examples.CS.WebControls.Design.
        SimpleRadioButtonListDataBindingHandler))]
    public class SimpleRadioButtonList : RadioButtonList
    {
    } // SimpleRadioButtonList
} // Examples.CS.WebControls.Design

The following code example shows how to derive the SimpleRadioButtonListDataBindingHandler class from the ListControlDataBindingHandler class. It overrides the DataBindControl method to add a message to the associated SimpleRadioButtonList control when that control is data bound.

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Web.UI;
using System.Web.UI.Design.WebControls;

namespace Examples.CS.WebControls.Design
{
    // Derive the SimpleRadioButtonListDataBindingHandler.
    public class SimpleRadioButtonListDataBindingHandler : 
        ListControlDataBindingHandler
    {
        // Override the DataBindControl. 
        public override void DataBindControl(IDesignerHost designerHost, 
            Control control)
        {
            // Create a reference, named dataSourceBinding, 
            // to the control DataSource binding.
            DataBinding dataSourceBinding = 
                ((IDataBindingsAccessor)control).DataBindings["DataSource"];

            // If the binding exists, create a reference to the
            // list control, clear its ListItemCollection, and then add
            // an item to the collection.
            if (! (dataSourceBinding == null))
            {
                SimpleRadioButtonList simpleControl = 
                    (SimpleRadioButtonList)control;

                simpleControl.Items.Clear();
                simpleControl.Items.Add("Data-bound Radio Button.");
            }
        } // DataBindControl
    } // SimpleRadioButtonListDataBindingHandler
} // Examples.CS.WebControls.Design

System.Object
   System.Web.UI.Design.DataBindingHandler
    System.Web.UI.Design.WebControls.ListControlDataBindingHandler

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0
Show:
© 2014 Microsoft