IExtenderListService 接口
提供可列出扩展程序提供程序的接口。
**命名空间:**System.ComponentModel.Design
**程序集:**System（在 system.dll 中）
语法
声明
Public Interface IExtenderListService
用法
Dim instance As IExtenderListService
public interface IExtenderListService
public interface class IExtenderListService
public interface IExtenderListService
public interface IExtenderListService
备注
当位置要提供扩展程序提供程序的列表时，它就可以实现此服务。默认情况下，生成扩展程序列表的方法是查询容器中每个实现 IExtenderProvider 的组件，以找到每个组件提供的扩展程序。通过在组件位置上实现此接口，容器可以重写提供程序的列表。
示例
下面的示例说明如何使用 IExtenderListService 获取当前处于活动状态的扩展程序提供程序集。
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 Not (extenderListService Is 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
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));
}
}
}
#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) );
}
};
}
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
平台
Windows 98、Windows 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
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
请参见
参考
IExtenderListService 成员
System.ComponentModel.Design 命名空间
IExtenderProvider 接口