IEventBindingService Schnittstelle

Definition

Stellt einen Dienst zum Registrieren von Ereignishandlern für Komponentenereignisse bereit.Provides a service for registering event handlers for component events.

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
Abgeleitet
Attribute

Beispiele

Im folgenden Beispiel wird ein Designer veranschaulicht, der den verwendet, IEventBindingService um das-Ereignis einer Komponente zur Entwurfszeit mit einem Ereignishandler zu verknüpfen, wenn der benutzerdefinierte Kontextmenü Befehl aufgerufen wird, den der Designer für die Komponente hinzufügt.The following example demonstrates a designer that uses the IEventBindingService to link a component's event with an event handler at design time when the custom shortcut menu command that the designer adds for the component is invoked. Um das Beispiel zu verwenden, kompilieren Sie es in eine Klassenbibliothek, fügen Sie einen Verweis aus einem Windows Forms Projekt hinzu, fügen Sie die Komponente in der Klassenbibliothek der Toolbox hinzu, indem Sie mit der rechten Maustaste auf die Toolbox klicken und Toolbox anpassenauswählen. Wählen Sie anschließend die Klassenbibliothek aus, und klicken Sie auf OK.To use the example, compile it to a class library, add a reference from a Windows Forms project, add the component in the class library to the Toolbox by right-clicking the Toolbox and selecting Customize Toolbox, then choosing the class library and clicking OK, and add an instance of the EventControl to a Form. Klicken Sie dann mit der rechten Maustaste auf Event Control, und klicken Sie auf den Kontextmenü Befehl connect Testevent.Then right-click the EventControl and click the Connect testEvent shortcut menu command. Es wird eine leere Ereignishandlermethode erstellt, und die Testevent-Methode von eventcontrol wird mit diesem Ereignishandler im Initialisierungs Code für das Formular initialisiert.An empty event handler method is created and the EventControl's testEvent method is initialized to this event handler in the initialization code for the Form.

#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.
    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] 
    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

Hinweise

Der Ereignis Bindungs Dienst bietet eine Möglichkeit zum Verknüpfen eines Ereignis Handlers mit einem Komponenten Ereignis aus dem Designer Code.The event binding service provides a way to link an event handler with a component event from designer code.

Zum Verknüpfen eines Ereignis Handlers mit einem Komponenten Ereignis mithilfe von IEventBindingService müssen Sie zuerst einen EventDescriptor für das-Ereignis der Komponente abrufen, die Sie verknüpfen möchten.To link an event handler with a component event using the IEventBindingService, you must first obtain an EventDescriptor for the event of the component you intend to link. IEventBindingServiceStellt Methoden bereit, mit denen ein in eine konvertiert werden kann, EventDescriptor mit der PropertyDescriptor Sie das Ereignis mit einem Ereignishandlermethoden-Namen konfigurieren können.The IEventBindingService provides methods that can convert an EventDescriptor to a PropertyDescriptor which you can use to configure the event with an event handler method name.

Das- TypeDescriptor Objekt stellt eine-Methode bereit, mit der GetEvents Sie eine EventDescriptorCollection enthaltende- EventDescriptor Objekte für jedes Ereignis einer Komponente abrufen können.The TypeDescriptor object provides a GetEvents method that you can use to obtain an EventDescriptorCollection containing EventDescriptor objects for each event of a component. Die GetEventProperty - GetEventProperties Methode und die- IEventBindingService Methode des geben einen PropertyDescriptor für jede EventDescriptor an beide Methoden an.The GetEventProperty and GetEventProperties methods of the IEventBindingService return a PropertyDescriptor for each EventDescriptor passed to either method. Jede PropertyDescriptor von oder zurückgegebene GetEventProperty GetEventProperties weist den Eigenschaftentyp String auf.Each PropertyDescriptor returned from GetEventProperty or GetEventProperties has a property type of string. Sie können diese Zeichenfolge auf einen Wert festlegen, der den Namen der Ereignishandlermethode angibt, mit der das Ereignis verknüpft werden soll, indem Sie die- SetValue Methode von verwenden PropertyDescriptor .You can set this string to a value that indicates the name of the event-handler method to link the event with using the SetValue method of the PropertyDescriptor.

Methoden

CreateUniqueMethodName(IComponent, EventDescriptor)

Erstellt einen eindeutigen Namen einer Ereignishandlermethode für die angegebene Komponente und das angegebene Ereignis.Creates a unique name for an event-handler method for the specified component and event.

GetCompatibleMethods(EventDescriptor)

Ruft eine Auflistung von Ereignishandlermethoden ab, die über eine mit dem angegebenen Ereignis kompatible Methodensignatur verfügen.Gets a collection of event-handler methods that have a method signature compatible with the specified event.

GetEvent(PropertyDescriptor)

Ruft einen EventDescriptor für das Ereignis ab, das vom angegebenen Eigenschaftenbezeichner dargestellt wird, sofern dieser ein Ereignis darstellt.Gets an EventDescriptor for the event that the specified property descriptor represents, if it represents an event.

GetEventProperties(EventDescriptorCollection)

Konvertiert eine Gruppe von Ereignisdeskriptoren in eine Gruppe von Eigenschaftenbezeichnern.Converts a set of event descriptors to a set of property descriptors.

GetEventProperty(EventDescriptor)

Konvertiert einen einzelnen Ereignisdeskriptor in einen Eigenschaftenbezeichner.Converts a single event descriptor to a property descriptor.

ShowCode()

Zeigt den Benutzercode für den Designer an.Displays the user code for the designer.

ShowCode(IComponent, EventDescriptor)

Zeigt den Benutzercode für das angegebene Ereignis an.Displays the user code for the specified event.

ShowCode(Int32)

Zeigt den Benutzercode für den Designer in der angegebenen Zeile an.Displays the user code for the designer at the specified line.

Gilt für:

Siehe auch