IExtenderListService Interface
Definition
Important
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Provides an interface that can list extender providers.
public interface class IExtenderListServicepublic interface IExtenderListServicetype IExtenderListService = interfacePublic Interface IExtenderListServiceExamples
The following example demonstrates using the IExtenderListService to obtain the set of currently active extender providers.
#using <system.dll>
#using <system.drawing.dll>
#using <system.windows.forms.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Windows::Forms;
namespace ExtenderListServiceExample
{
// This control lists any active extender providers.
public ref class ExtenderListServiceControl: public UserControl
{
private:
IExtenderListService^ extenderListService;
array<String^>^extenderNames;
public:
ExtenderListServiceControl()
{
this->Width = 600;
}
property ISite^ Site
{
// Queries the IExtenderListService when the control is sited
// in design mode.
virtual ISite^ get() override
{
return __super::Site;
}
virtual void set( ISite^ value ) override
{
__super::Site = value;
if ( this->DesignMode )
{
extenderListService = dynamic_cast<IExtenderListService^>(this->GetService( IExtenderListService::typeid ));
if ( extenderListService != nullptr )
{
array<IExtenderProvider^>^extenders = extenderListService->GetExtenderProviders();
extenderNames = gcnew array<String^>(extenders->Length);
for ( int i = 0; i < extenders->Length; i++ )
extenderNames[ i ] = String::Concat( "ExtenderProvider #", i.ToString(), ": ", extenders[ i ]->GetType()->FullName );
}
}
else
{
extenderListService = nullptr;
}
}
}
protected:
// Draws a list of any active extender providers
virtual void OnPaint( PaintEventArgs^ e ) override
{
if ( extenderNames->Length == 0 )
e->Graphics->DrawString( "No active extender providers", gcnew System::Drawing::Font( "Arial",9 ), gcnew SolidBrush( Color::Black ), 10, 10 );
else
e->Graphics->DrawString( "List of types of active extender providers", gcnew System::Drawing::Font( "Arial",9 ), gcnew SolidBrush( Color::Black ), 10, 10 );
for ( int i = 0; i < extenderNames->Length; i++ )
e->Graphics->DrawString( extenderNames[ i ], gcnew System::Drawing::Font( "Arial",8 ), gcnew SolidBrush( Color::Black ), 10, 25 + (i * 10) );
}
};
}
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
{
get
{
return base.Site;
}
set
{
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;
}
}
else
{
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);
else
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));
}
}
}
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
Remarks
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.
Methods
| GetExtenderProviders() |
Gets the set of extender providers for the component. |
Applies to
See also
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