IExtenderListService Interfaccia

Definizione

public interface class IExtenderListService

public interface IExtenderListService

type IExtenderListService = interface

Public Interface IExtenderListService

Esempio

Nell'esempio seguente viene illustrato l'uso dell'oggetto IExtenderListService per ottenere il set di provider di estensioni attualmente attivi.

#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

Commenti

Un sito può implementare questo servizio se vuole fornire un elenco di provider di estensioni. Per impostazione predefinita, l'elenco di estensioni viene generato eseguendo query su ogni componente nel contenitore che implementa per i estensioni IExtenderProvider ognuno di essi. Implementando questa interfaccia in un sito del componente, un contenitore può eseguire l'override dell'elenco di provider.

Metodi

Si applica a

Vedi anche

• IExtenderProvider