IEventBindingService Interface

Définition

public interface class IEventBindingService

public interface IEventBindingService

[System.Runtime.InteropServices.ComVisible(true)]
public interface IEventBindingService

type IEventBindingService = interface

[<System.Runtime.InteropServices.ComVisible(true)>]
type IEventBindingService = interface

Public Interface IEventBindingService

Dérivé

System.ComponentModel.Design.EventBindingService

Attributs

ComVisibleAttribute

Exemples

L’exemple suivant illustre un concepteur qui utilise pour lier l’événement IEventBindingService d’un composant à un gestionnaire d’événements au moment de la conception lorsque la commande de menu contextuel personnalisée que le concepteur ajoute pour le composant est appelée. Pour utiliser l’exemple, compilez-le dans une bibliothèque de classes, ajoutez une référence à partir d’un projet Windows Forms, ajoutez le composant de la bibliothèque de classes à la boîte à outils en cliquant avec le bouton droit sur la boîte à outils et en sélectionnant Personnaliser la boîte à outils, puis en choisissant la bibliothèque de classes et en cliquant sur OK, puis ajoutez un instance de l’EventControl à un formulaire. Cliquez ensuite avec le bouton droit sur EventControl et cliquez sur la commande de menu contextuel Connecter testEvent. Une méthode de gestionnaire d’événements vide est créée et la méthode testEvent d’EventControl est initialisée dans ce gestionnaire d’événements dans le code d’initialisation du formulaire.

#using <System.Windows.Forms.dll>
#using <System.Data.dll>
#using <System.Drawing.dll>
#using <System.Design.dll>
#using <System.dll>

using namespace System;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Drawing;
using namespace System::Data;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Design;
using namespace System::Security::Permissions;

// This designer provides a "Connect testEvent" designer verb shortcut 
// menu command. When invoked, the command attaches a new event-handler 
// method named "testEventHandler" to the "testEvent" event of an 
// associated control.
// If a "testEvent" event of the associated control does not exist, 
// the IEventBindingService declares it.
public ref class EventDesigner: public System::Windows::Forms::Design::ControlDesigner
{
public:
   EventDesigner(){}

   // When the "Connect testEvent" designer verb shortcut menu 
   // command is invoked, this method uses the 
   // IEventBindingService to attach an event handler to a 
   // "textEvent" event of the associated control.
private:
   void ConnectEvent( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      IEventBindingService^ eventservice = dynamic_cast<IEventBindingService^>(this->Component->Site->GetService( System::ComponentModel::Design::IEventBindingService::typeid ));
      if ( eventservice != nullptr )
      {
         // Attempt to obtain a PropertyDescriptor for a 
         // component event named "testEvent".
         EventDescriptorCollection^ edc = TypeDescriptor::GetEvents( this->Component );
         if ( edc == nullptr || edc->Count == 0 )
                  return;
         EventDescriptor^ ed = nullptr;

         // Search for an event named "testEvent".
         IEnumerator^ myEnum = edc->GetEnumerator();
         while ( myEnum->MoveNext() )
         {
            EventDescriptor^ edi = safe_cast<EventDescriptor^>(myEnum->Current);
            if ( edi->Name->Equals( "testEvent" ) )
            {
               ed = edi;
               break;
            }
         }
         if ( ed == nullptr )
                  return;

         // Use the IEventBindingService to get a 
         // PropertyDescriptor for the event.
         PropertyDescriptor^ pd = eventservice->GetEventProperty( ed );
         if ( pd == nullptr )
                  return;

         // Set the value of the event to "testEventHandler".
         pd->SetValue( this->Component, "testEventHandler" );
      }
   }

public:
   property System::ComponentModel::Design::DesignerVerbCollection^ Verbs 
   {
      // Provides a designer verb command for the designer's 
      // shortcut menu.
      [PermissionSetAttribute(SecurityAction::Demand, Name="FullTrust")]
      virtual System::ComponentModel::Design::DesignerVerbCollection^ get() override
      {
         DesignerVerbCollection^ dvc = gcnew DesignerVerbCollection;
         dvc->Add( gcnew DesignerVerb( "Connect testEvent",gcnew EventHandler( this, &EventDesigner::ConnectEvent ) ) );
         return dvc;
      }
   }
};

// EventControl is associated with the EventDesigner and displays 
// instructions for demonstrating the service.

[Designer(EventDesigner::typeid)]
public ref class EventControl: public System::Windows::Forms::UserControl
{
public:
   event System::EventHandler^ testEvent;
   EventControl()
   {
      this->BackColor = Color::White;
      this->Size = System::Drawing::Size( 320, 96 );
   }

public:
   ~EventControl()
   {
   }

protected:
   virtual void OnPaint( System::Windows::Forms::PaintEventArgs^ e ) override
   {
      e->Graphics->DrawString( "IEventBindingService Example Control", gcnew System::Drawing::Font( FontFamily::GenericMonospace,10 ), gcnew SolidBrush( Color::Blue ), 5, 5 );
      e->Graphics->DrawString( "Use the \"Connect testEvent\" command of the", gcnew System::Drawing::Font( FontFamily::GenericMonospace,8 ), gcnew SolidBrush( Color::Black ), 5, 22 );
      e->Graphics->DrawString( "right-click shortcut menu provided by this", gcnew System::Drawing::Font( FontFamily::GenericMonospace,8 ), gcnew SolidBrush( Color::Black ), 5, 32 );
      e->Graphics->DrawString( "control's associated EventDesigner to create", gcnew System::Drawing::Font( FontFamily::GenericMonospace,8 ), gcnew SolidBrush( Color::Black ), 5, 42 );
      e->Graphics->DrawString( "a new event handler linked with the testEvent", gcnew System::Drawing::Font( FontFamily::GenericMonospace,8 ), gcnew SolidBrush( Color::Black ), 5, 52 );
      e->Graphics->DrawString( "of this control in the initialization code", gcnew System::Drawing::Font( FontFamily::GenericMonospace,8 ), gcnew SolidBrush( Color::Black ), 5, 62 );
      e->Graphics->DrawString( "for this control.", gcnew System::Drawing::Font( FontFamily::GenericMonospace,8 ), gcnew SolidBrush( Color::Black ), 5, 72 );
   }
};

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

namespace EventDesignerTest
{
    // This designer provides a "Connect testEvent" designer verb shortcut 
    // menu command. When invoked, the command attaches a new event-handler 
    // method named "testEventHandler" to the "testEvent" event of an 
    // associated control.
    // If a "testEvent" event of the associated control does not exist, 
    // the IEventBindingService declares it.
    public class EventDesigner : System.Windows.Forms.Design.ControlDesigner
    {
        public EventDesigner()
        {
        }
        
        // When the "Connect testEvent" designer verb shortcut menu 
        // command is invoked, this method uses the 
        // IEventBindingService to attach an event handler to a 
        // "textEvent" event of the associated control.
        private void ConnectEvent(object sender, EventArgs e)
        {
            IEventBindingService eventservice = (IEventBindingService)this.Component.Site.GetService(typeof(System.ComponentModel.Design.IEventBindingService));
            if( eventservice != null )
            {
                // Attempt to obtain a PropertyDescriptor for a 
                // component event named "testEvent".
                EventDescriptorCollection edc = TypeDescriptor.GetEvents(this.Component);				
                if( edc == null || edc.Count == 0 )
                    return;
                                
                EventDescriptor ed = null;
                // Search for an event named "testEvent".
                foreach(EventDescriptor edi in edc)
                    if(edi.Name == "testEvent")
                    {
                        ed = edi;
                        break;
                    }
                if( ed == null )
                    return;

                // Use the IEventBindingService to get a 
                // PropertyDescriptor for the event.
                PropertyDescriptor pd = eventservice.GetEventProperty(ed);
                if( pd == null )
                    return;				
                
                // Set the value of the event to "testEventHandler".
                pd.SetValue(this.Component, "testEventHandler");
            }
        }

                // Provides a designer verb command for the designer's 
                // shortcut menu.
        public override System.ComponentModel.Design.DesignerVerbCollection Verbs
        {
            get
            {
                DesignerVerbCollection dvc = new DesignerVerbCollection();
                dvc.Add(new DesignerVerb("Connect testEvent", new EventHandler(ConnectEvent)));
                return dvc;
            }
        }
    }

    // EventControl is associated with the EventDesigner and displays 
    // instructions for demonstrating the service.
    [Designer(typeof(EventDesigner))]
    public class EventControl : System.Windows.Forms.UserControl
    {
        public event System.EventHandler testEvent;

        public EventControl()
        {		
            this.BackColor = Color.White;	
            this.Size = new Size(320, 96);
        }

        protected override void Dispose( bool disposing )
        {
            base.Dispose( disposing );
        }

        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
        {
            e.Graphics.DrawString("IEventBindingService Example Control", new Font(FontFamily.GenericMonospace, 10), new SolidBrush(Color.Blue), 5, 5);
            
            e.Graphics.DrawString("Use the \"Connect testEvent\" command of the", new Font(FontFamily.GenericMonospace, 8), new SolidBrush(Color.Black), 5, 22);
            e.Graphics.DrawString("right-click shortcut menu provided by this", new Font(FontFamily.GenericMonospace, 8), new SolidBrush(Color.Black), 5, 32);
            e.Graphics.DrawString("control's associated EventDesigner to create", new Font(FontFamily.GenericMonospace, 8), new SolidBrush(Color.Black), 5, 42);
            e.Graphics.DrawString("a new event handler linked with the testEvent", new Font(FontFamily.GenericMonospace, 8), new SolidBrush(Color.Black), 5, 52);
            e.Graphics.DrawString("of this control in the initialization code", new Font(FontFamily.GenericMonospace, 8), new SolidBrush(Color.Black), 5, 62);
            e.Graphics.DrawString("for this control.", new Font(FontFamily.GenericMonospace, 8), new SolidBrush(Color.Black), 5, 72);
        }
    }
}

Imports System.Collections
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Data
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Windows.Forms.Design

Namespace EventDesignerTest
    ' This designer provides a "Connect testEvent" designer verb shortcut 
    ' menu command. When invoked, the command attaches a new event-handler 
    ' method named "testEventHandler" to the "testEvent" event of an 
    ' associated control.
    ' If a "testEvent" event of the associated control does not exist, 
    ' the IEventBindingService declares it.
    <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
    Public Class EventDesigner
        Inherits System.Windows.Forms.Design.ControlDesigner

        Public Sub New()
        End Sub

        ' When the "Connect testEvent" designer verb shortcut menu 
        ' command is invoked, this method uses the 
        ' IEventBindingService to attach an event handler to a "textEvent" event of the associated control.
        Private Sub ConnectEvent(ByVal sender As Object, ByVal e As EventArgs)
            Dim eventservice As IEventBindingService = CType(Me.Component.Site.GetService(GetType(System.ComponentModel.Design.IEventBindingService)), IEventBindingService)
            If (eventservice IsNot Nothing) Then
                ' Attempt to obtain a PropertyDescriptor for a 
                ' component event named "testEvent".
                Dim edc As EventDescriptorCollection = TypeDescriptor.GetEvents(Me.Component)
                If edc Is Nothing Or edc.Count = 0 Then
                    Return
                End If
                Dim ed As EventDescriptor = Nothing
                ' Search for an event named "testEvent".
                Dim edi As EventDescriptor
                For Each edi In edc
                    If edi.Name = "testEvent" Then
                        ed = edi
                        Exit For
                    End If
                Next edi
                If ed Is Nothing Then
                    Return
                End If
                ' Use the IEventBindingService to get a 
                ' PropertyDescriptor for the event.
                Dim pd As PropertyDescriptor = eventservice.GetEventProperty(ed)
                If pd Is Nothing Then
                    Return
                End If
                ' Set the value of the event to "testEventHandler".
                pd.SetValue(Me.Component, "testEventHandler")
            End If
        End Sub

        ' Provides a designer verb command for the designer's 
        ' shortcut menu.
        Public Overrides ReadOnly Property Verbs() As System.ComponentModel.Design.DesignerVerbCollection
            Get
                Dim dvc As New DesignerVerbCollection()
                dvc.Add(New DesignerVerb("Connect testEvent", New EventHandler(AddressOf ConnectEvent)))
                Return dvc
            End Get
        End Property
    End Class

    ' EventControl is associated with the EventDesigner and displays 
    ' instructions for demonstrating the service.
    <Designer(GetType(EventDesigner))> _
    Public Class EventControl
        Inherits System.Windows.Forms.UserControl
        Public Event testEvent As System.EventHandler

        Public Sub New()
            Me.BackColor = Color.White
            Me.Size = New Size(320, 96)
        End Sub

        Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
            MyBase.Dispose(disposing)
        End Sub

        Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
            e.Graphics.DrawString("IEventBindingService Example Control", New Font(FontFamily.GenericMonospace, 10), New SolidBrush(Color.Blue), 5, 5)
            e.Graphics.DrawString("Use the ""Connect testEvent"" command of the", New Font(FontFamily.GenericMonospace, 8), New SolidBrush(Color.Black), 5, 22)
            e.Graphics.DrawString("right-click shortcut menu provided by this", New Font(FontFamily.GenericMonospace, 8), New SolidBrush(Color.Black), 5, 32)
            e.Graphics.DrawString("control's associated EventDesigner to create", New Font(FontFamily.GenericMonospace, 8), New SolidBrush(Color.Black), 5, 42)
            e.Graphics.DrawString("a new event handler linked with the testEvent", New Font(FontFamily.GenericMonospace, 8), New SolidBrush(Color.Black), 5, 52)
            e.Graphics.DrawString("of this control in the initialization code", New Font(FontFamily.GenericMonospace, 8), New SolidBrush(Color.Black), 5, 62)
            e.Graphics.DrawString("for this control.", New Font(FontFamily.GenericMonospace, 8), New SolidBrush(Color.Black), 5, 72)
        End Sub

    End Class
End Namespace

Remarques

Le service de liaison d’événements permet de lier un gestionnaire d’événements à un événement de composant à partir du code du concepteur.

Pour lier un gestionnaire d’événements à un événement de composant à l’aide du IEventBindingService, vous devez d’abord obtenir un EventDescriptor pour l’événement du composant que vous envisagez de lier. Fournit IEventBindingService des méthodes qui peuvent convertir un EventDescriptor en que PropertyDescriptor vous pouvez utiliser pour configurer l’événement avec un nom de méthode de gestionnaire d’événements.

L’objet TypeDescriptor fournit une GetEvents méthode que vous pouvez utiliser pour obtenir un EventDescriptorCollection objet contenant EventDescriptor pour chaque événement d’un composant. Les GetEventProperty méthodes et GetEventProperties de retournent IEventBindingService un pour chacune d’elles EventDescriptor passée à l’une PropertyDescriptor ou l’autre méthode. Chaque PropertyDescriptor retourné à partir de GetEventProperty ou GetEventProperties a un type de propriété de chaîne. Vous pouvez définir cette chaîne sur une valeur qui indique le nom de la méthode de gestionnaire d’événements avec laquelle lier l’événement à l’aide de la SetValue méthode du PropertyDescriptor.

Méthodes

S’applique à

Voir aussi

• PropertyDescriptor
• EventDescriptor
• PropertyDescriptorCollection
• EventDescriptorCollection