IExtenderListService Interface
.NET Framework 3.0
Provides an interface that can list extender providers.
Namespace: System.ComponentModel.Design
Assembly: System (in system.dll)
Assembly: System (in system.dll)
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.
Imports System Imports System.Collections Imports System.ComponentModel Imports System.ComponentModel.Design Imports System.Drawing Imports System.Data Imports System.Windows.Forms ' This control lists any active extender providers. Public Class ExtenderListServiceControl Inherits System.Windows.Forms.UserControl Private extenderListService As IExtenderListService Private extenderNames() As String Public Sub New() extenderNames = New String(-1) {} Me.Width = 600 End Sub ' Queries the IExtenderListService when the control is sited ' in design mode. Public Overrides Property Site() As System.ComponentModel.ISite Get Return MyBase.Site End Get Set(ByVal Value As System.ComponentModel.ISite) MyBase.Site = Value If Me.DesignMode Then extenderListService = CType(Me.GetService(GetType(IExtenderListService)), IExtenderListService) If (extenderListService IsNot Nothing) Then Dim extenders As IExtenderProvider() = extenderListService.GetExtenderProviders() extenderNames = New String(extenders.Length) {} Dim i As Integer For i = 0 To extenders.Length - 1 Dim types As Type() = Type.GetTypeArray(extenders) extenderNames(i) = "ExtenderProvider #" + i.ToString() + ": " + types(i).FullName Next i End If Else extenderListService = Nothing extenderNames = New String(-1) {} End If End Set End Property ' Draws a list of any active extender providers Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) If extenderNames.Length = 0 Then e.Graphics.DrawString("No active extender providers", New Font("Arial", 9), New SolidBrush(Color.Black), 10, 10) Else e.Graphics.DrawString("List of types of active extender providers", New Font("Arial", 9), New SolidBrush(Color.Black), 10, 10) End If Dim i As Integer For i = 0 To extenderNames.Length - 1 e.Graphics.DrawString(extenderNames(i), New Font("Arial", 8), New SolidBrush(Color.Black), 10, 25 + i * 10) Next i End Sub End Class
package ExtenderListServiceExample;
import System.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.ComponentModel.Design.*;
import System.Drawing.*;
import System.Data.*;
import System.Windows.Forms.*;
// This control lists any active extender providers.
public class ExtenderListServiceControl extends System.Windows.Forms.UserControl
{
private IExtenderListService extenderListService;
private String extenderNames[];
public ExtenderListServiceControl()
{
extenderNames = new String[0];
this.set_Width(600);
} //ExtenderListServiceControl
// Queries the IExtenderListService when the control is sited
// in design mode.
/** @property
*/
public System.ComponentModel.ISite get_Site()
{
return super.get_Site();
}//get_Site
/** @property
*/
public void set_Site(System.ComponentModel.ISite value)
{
super.set_Site(value);
if (this.get_DesignMode()) {
extenderListService = (IExtenderListService)this.GetService(
IExtenderListService.class.ToType());
if (extenderListService != null) {
IExtenderProvider extenders[] = extenderListService.
GetExtenderProviders();
extenderNames = new String[extenders.length];
for (int i = 0; i < extenders.length; i++) {
extenderNames.set_Item(i, "ExtenderProvider #" + i + ": "
+ extenders.get_Item(i).GetType().get_FullName());
}
}
}
else {
extenderListService = null;
extenderNames = new String[0];
}
} //set_Site
// Draws a list of any active extender providers
protected void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
if (extenderNames.length == 0) {
e.get_Graphics().DrawString("No active extender providers",
new Font("Arial", 9), new SolidBrush(Color.get_Black()),
10, 10);
}
else {
e.get_Graphics().DrawString("List of types of active extender "
+ " providers", new Font("Arial", 9),
new SolidBrush(Color.get_Black()), 10, 10);
}
for (int i = 0; i < extenderNames.length; i++) {
e.get_Graphics().DrawString(extenderNames.get_Item(i) + "",
new Font("Arial", 8), new SolidBrush(Color.get_Black()), 10f,
(float)(25 + (i * 10)));
}
} //OnPaint
} //ExtenderListServiceControl
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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