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IExtenderListService Interface

Provides an interface that can list extender providers.

Namespace:  System.ComponentModel.Design
Assembly:  System (in System.dll)

public interface IExtenderListService

A site can implement this service if it wants to provide a list of extender providers. By default, the list of extenders is generated by querying each component in the container that implements IExtenderProvider for the extenders each provides. By implementing this interface on a component site, a container can override the list of providers.

The following example demonstrates using the IExtenderListService to obtain the set of currently active extender providers.

using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

namespace ExtenderListServiceExample
    // This control lists any active extender providers. 
    public class ExtenderListServiceControl : System.Windows.Forms.UserControl
        private IExtenderListService extenderListService;
        private string[] extenderNames;

        public ExtenderListServiceControl()
            extenderNames = new string[0];
            this.Width = 600;

        // Queries the IExtenderListService when the control is sited  
        // in design mode. 
        public override System.ComponentModel.ISite Site
                return base.Site;
                base.Site = value;
                if( this.DesignMode )
                    extenderListService = (IExtenderListService)this.GetService(typeof(IExtenderListService));
                    if( extenderListService != null )
                        IExtenderProvider[] extenders = extenderListService.GetExtenderProviders();
                        extenderNames = new string[extenders.Length];
                        for( int i=0; i<extenders.Length; i++ )
                            extenderNames[i] = "ExtenderProvider #"+i.ToString()+":  "+extenders[i].GetType().FullName;
                    extenderListService = null;
                    extenderNames = new string[0];

        // Draws a list of any active extender providers 
        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
            if( extenderNames.Length == 0 )
                e.Graphics.DrawString("No active extender providers", new Font("Arial", 9), new SolidBrush(Color.Black), 10, 10);
                e.Graphics.DrawString("List of types of active extender providers", new Font("Arial", 9), new SolidBrush(Color.Black), 10, 10);
            for(int i=0; i<extenderNames.Length; i++)
                e.Graphics.DrawString(extenderNames[i], new Font("Arial", 8), new SolidBrush(Color.Black), 10, 25+(i*10));

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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