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IComponentChangeService-Schnittstelle

Bietet eine Schnittstelle zum Hinzufügen und Entfernen von Handlern für Ereignisse, die Komponenten hinzufügen, ändern, entfernen oder umbenennen, sowie Methoden zum Auslösen eines ComponentChanged-Ereignisses oder eines ComponentChanging-Ereignisses.

Namespace: System.ComponentModel.Design
Assembly: System (in system.dll)

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public Interface IComponentChangeService
'Usage
Dim instance As IComponentChangeService
[ComVisibleAttribute(true)] 
public interface IComponentChangeService
[ComVisibleAttribute(true)] 
public interface class IComponentChangeService
/** @attribute ComVisibleAttribute(true) */ 
public interface IComponentChangeService
ComVisibleAttribute(true) 
public interface IComponentChangeService

Hinweise

IComponentChangeService stellt eine Schnittstelle bereit, die für die Angabe der Methoden zur Behandlung der folgenden Ereignisse verwendet werden kann:

  • ComponentAdded wird ausgelöst, wenn eine Komponente hinzugefügt ist.

  • ComponentAdding wird ausgelöst, wenn eine Komponente gerade hinzugefügt wird.

  • ComponentChanged wird ausgelöst, wenn eine Komponente geändert ist.

  • ComponentChanging wird ausgelöst, wenn eine Komponente gerade geändert wird.

  • ComponentRemoved wird ausgelöst, wenn eine Komponente entfernt ist.

  • ComponentRemoving wird ausgelöst, wenn eine Komponente gerade entfernt wird.

  • ComponentRename wird ausgelöst, wenn eine Komponente umbenannt ist.

Normalerweise werden die Ereignisse für das Hinzufügen, Ändern, Entfernen und Umbenennen von Komponenten von der Entwurfsumgebung ausgelöst. Designer sollten die Methoden dieser Schnittstelle aufrufen, wenn DesignerTransaction-Objekte verwendet werden, die Möglichkeiten zum Rückgängigmachen und Wiederherstellen von Entwurfszeitaktionen bereitstellen, die Auswirkungen auf Komponenten haben. Weitere Informationen finden Sie in der Dokumentation zu DesignerTransaction. Im Allgemeinen behandelt nur der Haupt-Designer diese Änderungsbenachrichtigungen.

Dieser Dienst stellt außerdem Methoden bereit, die Ereignisse auslösen, wenn eine Komponente geändert ist oder gerade geändert wird. Ein PropertyDescriptor oder eine Komponente können mit der OnComponentChanged-Methode bzw. mit der OnComponentChanging-Methode angeben, dass eine Komponente geändert ist bzw. gerade geändert wird.

Beispiel

Im folgenden Beispiel wird dargestellt, wie die IComponentChangeService-Schnittstelle verwendet wird, um Benachrichtigungen über das Hinzufügen, Entfernen und Ändern von Komponenten im Entwurfsmodus zu erhalten.

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

'  This sample illustrates how to use the IComponentChangeService interface 
'    to handle component change events.  The ComponentClass control attaches 
'    event handlers when it is sited in a document, and displays a message 
'    when notification that a component has been added, removed, or changed
'    is received from the IComponentChangeService.

'    To run this sample, add the ComponentClass control to a Form and
'    add, remove, or change components to see the behavior of the
'    component change event handlers. 

Namespace IComponentChangeServiceExample
    _
   Public Class ComponentClass
      Inherits System.Windows.Forms.UserControl
      Private components As System.ComponentModel.Container = Nothing
      Private listBox1 As System.Windows.Forms.ListBox
      Private m_changeService As IComponentChangeService    
      
      Public Sub New()
         InitializeComponent()
        End Sub

        Private Sub InitializeComponent()
            Me.listBox1 = New System.Windows.Forms.ListBox()
            Me.SuspendLayout()

            ' listBox1.
            Me.listBox1.Location = New System.Drawing.Point(24, 16)
            Me.listBox1.Name = "listBox1"
            Me.listBox1.Size = New System.Drawing.Size(576, 277)
            Me.listBox1.TabIndex = 0

            ' ComponentClass.
            Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.listBox1})
            Me.Name = "ComponentClass"
            Me.Size = New System.Drawing.Size(624, 320)

            Me.ResumeLayout(False)
        End Sub

        ' This override allows the control to register event handlers for IComponentChangeService events
        ' at the time the control is sited, which happens only in design mode.
        Public Overrides Property Site() As ISite
            Get
                Return MyBase.Site
            End Get
            Set(ByVal Value As ISite)
                ' Clear any component change event handlers.
                ClearChangeNotifications()

                ' Set the new Site value.
                MyBase.Site = Value

                m_changeService = CType(GetService(GetType(IComponentChangeService)), IComponentChangeService)

                ' Register event handlers for component change events.
                RegisterChangeNotifications()
            End Set
        End Property

        Private Sub ClearChangeNotifications()
            ' The m_changeService value is null when not in design mode, 
            ' as the IComponentChangeService is only available at design time.  
            m_changeService = CType(GetService(GetType(IComponentChangeService)), IComponentChangeService)

            ' Clear our the component change events to prepare for re-siting.               
            If Not (m_changeService Is Nothing) Then
                RemoveHandler m_changeService.ComponentChanged, AddressOf OnComponentChanged
                RemoveHandler m_changeService.ComponentChanging, AddressOf OnComponentChanging
                RemoveHandler m_changeService.ComponentAdded, AddressOf OnComponentAdded
                RemoveHandler m_changeService.ComponentAdding, AddressOf OnComponentAdding
                RemoveHandler m_changeService.ComponentRemoved, AddressOf OnComponentRemoved
                RemoveHandler m_changeService.ComponentRemoving, AddressOf OnComponentRemoving
                RemoveHandler m_changeService.ComponentRename, AddressOf OnComponentRename
            End If
        End Sub

        Private Sub RegisterChangeNotifications()
            ' Register the event handlers for the IComponentChangeService events
            If Not (m_changeService Is Nothing) Then
                AddHandler m_changeService.ComponentChanged, AddressOf OnComponentChanged
                AddHandler m_changeService.ComponentChanging, AddressOf OnComponentChanging
                AddHandler m_changeService.ComponentAdded, AddressOf OnComponentAdded
                AddHandler m_changeService.ComponentAdding, AddressOf OnComponentAdding
                AddHandler m_changeService.ComponentRemoved, AddressOf OnComponentRemoved
                AddHandler m_changeService.ComponentRemoving, AddressOf OnComponentRemoving
                AddHandler m_changeService.ComponentRename, AddressOf OnComponentRename
            End If
        End Sub

        ' This method handles the OnComponentChanged event to display a notification. 
        Private Sub OnComponentChanged(ByVal sender As Object, ByVal ce As ComponentChangedEventArgs)
            If Not (ce.Component Is Nothing) And Not (CType(ce.Component, IComponent).Site Is Nothing) And Not (ce.Member Is Nothing) Then
                OnUserChange(("The " + ce.Member.Name + " member of the " + CType(ce.Component, IComponent).Site.Name + " component has been changed."))
            End If
        End Sub

        ' This method handles the OnComponentChanging event to display a notification. 
        Private Sub OnComponentChanging(ByVal sender As Object, ByVal ce As ComponentChangingEventArgs)
            If Not (ce.Component Is Nothing) And Not (CType(ce.Component, IComponent).Site Is Nothing) And Not (ce.Member Is Nothing) Then
                OnUserChange(("The " + ce.Member.Name + " member of the " + CType(ce.Component, IComponent).Site.Name + " component is being changed."))
            End If
        End Sub

        ' This method handles the OnComponentAdded event to display a notification. 
        Private Sub OnComponentAdded(ByVal sender As Object, ByVal ce As ComponentEventArgs)
            OnUserChange(("A component, " + ce.Component.Site.Name + ", has been added."))
        End Sub

        ' This method handles the OnComponentAdding event to display a notification. 
        Private Sub OnComponentAdding(ByVal sender As Object, ByVal ce As ComponentEventArgs)
            OnUserChange(("A component of type " + (CType(ce.Component, Component)).GetType().FullName + " is being added."))
        End Sub

        ' This method handles the OnComponentRemoved event to display a notification. 
        Private Sub OnComponentRemoved(ByVal sender As Object, ByVal ce As ComponentEventArgs)
            OnUserChange(("A component, " + ce.Component.Site.Name + ", has been removed."))
        End Sub

        ' This method handles the OnComponentRemoving event to display a notification. 
        Private Sub OnComponentRemoving(ByVal sender As Object, ByVal ce As ComponentEventArgs)
            OnUserChange(("A component, " + ce.Component.Site.Name + ", is being removed."))
        End Sub

        ' This method handles the OnComponentRename event to display a notification. 
        Private Sub OnComponentRename(ByVal sender As Object, ByVal ce As ComponentRenameEventArgs)
            OnUserChange(("A component, " + ce.OldName + ", was renamed to " + ce.NewName + "."))
        End Sub

        ' This method adds a specified notification message to the control's listbox.
        Private Sub OnUserChange(ByVal [text] As String)
            listBox1.Items.Add([text])
        End Sub

        ' Clean up any resources being used.
        Protected Overloads Sub Dispose(ByVal disposing As Boolean)
            If disposing Then
                ClearChangeNotifications()

                If Not (components Is Nothing) Then
                    components.Dispose()
                End If
            End If
            MyBase.Dispose(disposing)
        End Sub

    End Class
End Namespace
using System;
using System.Data;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;

/*  This sample illustrates how to use the IComponentChangeService interface 
    to handle component change events.  The ComponentClass control attaches 
    event handlers when it is sited in a document, and displays a message 
    when notification that a component has been added, removed, or changed
    is received from the IComponentChangeService.

    To run this sample, add the ComponentClass control to a Form and
    add, remove, or change components to see the behavior of the
    component change event handlers. */

namespace IComponentChangeServiceExample 
{
    public class ComponentClass : System.Windows.Forms.UserControl 
    {
        private System.ComponentModel.Container components = null;
    private System.Windows.Forms.ListBox listBox1;
    private IComponentChangeService m_changeService;
 
    public ComponentClass() 
    {
        InitializeComponent();
    }

    private void InitializeComponent() 
    {
        this.listBox1 = new System.Windows.Forms.ListBox();
        this.SuspendLayout();

        // listBox1.
        this.listBox1.Location = new System.Drawing.Point(24, 16);
        this.listBox1.Name = "listBox1";
        this.listBox1.Size = new System.Drawing.Size(576, 277);
        this.listBox1.TabIndex = 0;
           
        // ComponentClass.
        this.Controls.AddRange(new System.Windows.Forms.Control[] {this.listBox1});
        this.Name = "ComponentClass";
        this.Size = new System.Drawing.Size(624, 320);

            this.ResumeLayout(false);
    }

    // This override allows the control to register event handlers for IComponentChangeService events
    // at the time the control is sited, which happens only in design mode.
    public override ISite Site 
    {
        get 
        {
        return base.Site;
        }
        set 
        {       
        // Clear any component change event handlers.
        ClearChangeNotifications();     
                
        // Set the new Site value.
        base.Site = value;

        m_changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService));

        // Register event handlers for component change events.
        RegisterChangeNotifications();          
        }
    }

    private void ClearChangeNotifications()
    {
        // The m_changeService value is null when not in design mode, 
        // as the IComponentChangeService is only available at design time. 
        m_changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService));

        // Clear our the component change events to prepare for re-siting.              
        if (m_changeService != null) 
        {
        m_changeService.ComponentChanged -= new ComponentChangedEventHandler(OnComponentChanged);
        m_changeService.ComponentChanging -= new ComponentChangingEventHandler(OnComponentChanging);
        m_changeService.ComponentAdded -= new ComponentEventHandler(OnComponentAdded);
        m_changeService.ComponentAdding -= new ComponentEventHandler(OnComponentAdding);
        m_changeService.ComponentRemoved -= new ComponentEventHandler(OnComponentRemoved);
        m_changeService.ComponentRemoving -= new ComponentEventHandler(OnComponentRemoving);
        m_changeService.ComponentRename -= new ComponentRenameEventHandler(OnComponentRename);
        }
    }

    private void RegisterChangeNotifications()
    {
        // Register the event handlers for the IComponentChangeService events
        if (m_changeService != null) 
        {
        m_changeService.ComponentChanged += new ComponentChangedEventHandler(OnComponentChanged);
        m_changeService.ComponentChanging += new ComponentChangingEventHandler(OnComponentChanging);
        m_changeService.ComponentAdded += new ComponentEventHandler(OnComponentAdded);
        m_changeService.ComponentAdding += new ComponentEventHandler(OnComponentAdding);
        m_changeService.ComponentRemoved += new ComponentEventHandler(OnComponentRemoved);
        m_changeService.ComponentRemoving += new ComponentEventHandler(OnComponentRemoving);
        m_changeService.ComponentRename += new ComponentRenameEventHandler(OnComponentRename);
        }
    }

    /* This method handles the OnComponentChanged event to display a notification. */
    private void OnComponentChanged(object sender, ComponentChangedEventArgs ce) 
    {
        if( ce.Component != null && ((IComponent)ce.Component).Site != null && ce.Member != null ) 
        OnUserChange("The " + ce.Member.Name + " member of the " + ((IComponent)ce.Component).Site.Name + " component has been changed.");
    }

    /* This method handles the OnComponentChanging event to display a notification. */
    private void OnComponentChanging(object sender, ComponentChangingEventArgs ce) 
    {
        if( ce.Component != null && ((IComponent)ce.Component).Site != null && ce.Member != null ) 
        OnUserChange("The " + ce.Member.Name + " member of the " + ((IComponent)ce.Component).Site.Name + " component is being changed.");
    }

    /* This method handles the OnComponentAdded event to display a notification. */
    private void OnComponentAdded(object sender, ComponentEventArgs ce) 
    {           
        OnUserChange("A component, " + ce.Component.Site.Name + ", has been added.");
    }

    /* This method handles the OnComponentAdding event to display a notification. */        
    private void OnComponentAdding(object sender, ComponentEventArgs ce) 
    {           
        OnUserChange("A component of type " + ce.Component.GetType().FullName + " is being added.");
    }

    /* This method handles the OnComponentRemoved event to display a notification. */
    private void OnComponentRemoved(object sender, ComponentEventArgs ce) 
    {
        OnUserChange("A component, " + ce.Component.Site.Name + ", has been removed.");
    }

    /* This method handles the OnComponentRemoving event to display a notification. */
    private void OnComponentRemoving(object sender, ComponentEventArgs ce) 
    {
        OnUserChange("A component, " + ce.Component.Site.Name + ", is being removed.");
    }

    /* This method handles the OnComponentRename event to display a notification. */
    private void OnComponentRename(object sender, ComponentRenameEventArgs ce) 
    {
        OnUserChange("A component, " + ce.OldName + ", was renamed to " + ce.NewName +".");
    }

    // This method adds a specified notification message to the control's listbox.
    private void OnUserChange(string text) 
    {
        listBox1.Items.Add(text);
    }

    // Clean up any resources being used.
    protected override void Dispose( bool disposing ) 
    {
        if( disposing ) 
        {
        ClearChangeNotifications();
            
        if(components != null) 
        {
            components.Dispose();
        }
        }
        base.Dispose( disposing );
    }
    }
}
#using <system.dll>
#using <system.windows.forms.dll>
#using <system.drawing.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Windows::Forms;

/*  This sample illustrates how to use the IComponentChangeService interface
    to handle component change events.  The ComponentClass control attaches
    event handlers when it is sited in a document, and displays a message
    when notification that a component has been added, removed, or changed
    is received from the IComponentChangeService.

    To run this sample, add the ComponentClass control to a Form and
    add, remove, or change components to see the behavior of the
    component change event handlers. */

public ref class ComponentClass: public UserControl
{
private:
   System::ComponentModel::Container^ components;
   ListBox^ listBox1;
   IComponentChangeService^ m_changeService;
   void InitializeComponent()
   {
      this->listBox1 = gcnew ListBox;
      this->SuspendLayout();

      // listBox1.
      this->listBox1->Location = System::Drawing::Point( 24, 16 );
      this->listBox1->Name = "listBox1";
      this->listBox1->Size = System::Drawing::Size( 576, 277 );
      this->listBox1->TabIndex = 0;

      // ComponentClass.
      array<Control^>^myArray = {listBox1};
      this->Controls->AddRange( myArray );
      this->Name = "ComponentClass";
      this->Size = System::Drawing::Size( 624, 320 );
      this->ResumeLayout( false );
   }

   void ClearChangeNotifications()
   {
      // The m_changeService value is 0 when not in design mode,
      // as the IComponentChangeService is only available at design time.
      m_changeService = dynamic_cast<IComponentChangeService^>(GetService( IComponentChangeService::typeid ));

      // Clear our the component change events to prepare for re-siting.
      if ( m_changeService != nullptr )
      {
         m_changeService->ComponentChanged -= gcnew ComponentChangedEventHandler( this, &ComponentClass::OnComponentChanged );
         m_changeService->ComponentChanging -= gcnew ComponentChangingEventHandler( this, &ComponentClass::OnComponentChanging );
         m_changeService->ComponentAdded -= gcnew ComponentEventHandler( this, &ComponentClass::OnComponentAdded );
         m_changeService->ComponentAdding -= gcnew ComponentEventHandler( this, &ComponentClass::OnComponentAdding );
         m_changeService->ComponentRemoved -= gcnew ComponentEventHandler( this, &ComponentClass::OnComponentRemoved );
         m_changeService->ComponentRemoving -= gcnew ComponentEventHandler( this, &ComponentClass::OnComponentRemoving );
         m_changeService->ComponentRename -= gcnew ComponentRenameEventHandler( this, &ComponentClass::OnComponentRename );
      }
   }

   void RegisterChangeNotifications()
   {
      // Register the event handlers for the IComponentChangeService events
      if ( m_changeService != nullptr )
      {
         m_changeService->ComponentChanged += gcnew ComponentChangedEventHandler( this, &ComponentClass::OnComponentChanged );
         m_changeService->ComponentChanging += gcnew ComponentChangingEventHandler( this, &ComponentClass::OnComponentChanging );
         m_changeService->ComponentAdded += gcnew ComponentEventHandler( this, &ComponentClass::OnComponentAdded );
         m_changeService->ComponentAdding += gcnew ComponentEventHandler( this, &ComponentClass::OnComponentAdding );
         m_changeService->ComponentRemoved += gcnew ComponentEventHandler( this, &ComponentClass::OnComponentRemoved );
         m_changeService->ComponentRemoving += gcnew ComponentEventHandler( this, &ComponentClass::OnComponentRemoving );
         m_changeService->ComponentRename += gcnew ComponentRenameEventHandler( this, &ComponentClass::OnComponentRename );
      }
   }

   /* This method handles the OnComponentChanged event to display a notification. */
   void OnComponentChanged( Object^ /*sender*/, ComponentChangedEventArgs^ ce )
   {
      if ( ce->Component != nullptr && static_cast<IComponent^>(ce->Component)->Site != nullptr && ce->Member != nullptr )
            OnUserChange( "The " + ce->Member->Name + " member of the " + static_cast<IComponent^>(ce->Component)->Site->Name + " component has been changed." );
   }


   /* This method handles the OnComponentChanging event to display a notification. */
   void OnComponentChanging( Object^ /*sender*/, ComponentChangingEventArgs^ ce )
   {
      if ( ce->Component != nullptr && static_cast<IComponent^>(ce->Component)->Site != nullptr && ce->Member != nullptr )
            OnUserChange( "The " + ce->Member->Name + " member of the " + static_cast<IComponent^>(ce->Component)->Site->Name + " component is being changed." );
   }

   /* This method handles the OnComponentAdded event to display a notification. */
   void OnComponentAdded( Object^ /*sender*/, ComponentEventArgs^ ce )
   {
      OnUserChange( "A component, " + ce->Component->Site->Name + ", has been added." );
   }

   /* This method handles the OnComponentAdding event to display a notification. */
   void OnComponentAdding( Object^ /*sender*/, ComponentEventArgs^ ce )
   {
      OnUserChange( "A component of type " + ce->Component->GetType()->FullName + " is being added." );
   }

   /* This method handles the OnComponentRemoved event to display a notification. */
   void OnComponentRemoved( Object^ /*sender*/, ComponentEventArgs^ ce )
   {
      OnUserChange( "A component, " + ce->Component->Site->Name + ", has been removed." );
   }

   /* This method handles the OnComponentRemoving event to display a notification. */
   void OnComponentRemoving( Object^ /*sender*/, ComponentEventArgs^ ce )
   {
      OnUserChange( "A component, " + ce->Component->Site->Name + ", is being removed." );
   }

   /* This method handles the OnComponentRename event to display a notification. */
   void OnComponentRename( Object^ /*sender*/, ComponentRenameEventArgs^ ce )
   {
      OnUserChange( "A component, " + ce->OldName + ", was renamed to " + ce->NewName + "." );
   }

   // This method adds a specified notification message to the control's listbox.
   void OnUserChange( String^ text )
   {
      listBox1->Items->Add( text );
   }

public:
   ComponentClass()
   {
      InitializeComponent();
   }

   property ISite^ Site 
   {
      // This override allows the control to register event handlers for IComponentChangeService events
      // at the time the control is sited, which happens only in design mode.
      virtual ISite^ get() override
      {
         return Site;
      }

      virtual void set( ISite^ value ) override
      {
         // Clear any component change event handlers.
         ClearChangeNotifications();

         // Set the new Site value.
         Site = value;
         m_changeService = static_cast<IComponentChangeService^>(GetService( IComponentChangeService::typeid ));

         // Register event handlers for component change events.
         RegisterChangeNotifications();
      }
   }

   // Clean up any resources being used.
public:
   ~ComponentClass()
   {
      ClearChangeNotifications();
      if ( components != nullptr )
      {
         delete components;
      }
   }
};
import System.*;
import System.Data.*;
import System.Drawing.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.ComponentModel.Design.*;
import System.Windows.Forms.*;

/*  This sample illustrates how to use the IComponentChangeService interface
    to handle component change events.  The ComponentClass control attaches 
    event handlers when it is sited in a document, and displays a message 
    when notification that a component has been added, removed, or changed
    is received from the IComponentChangeService.

    To run this sample, add the ComponentClass control to a Form and
    add, remove, or change components to see the behavior of the
    component change event handlers. 
 */

public class ComponentClass extends System.Windows.Forms.UserControl
{
    private System.ComponentModel.Container components = null;
    private System.Windows.Forms.ListBox listBox1;
    private IComponentChangeService m_changeService;

    public ComponentClass()
    {
        InitializeComponent();
    } //ComponentClass

    private void InitializeComponent()
    {
        this.listBox1 = new System.Windows.Forms.ListBox();
        this.SuspendLayout();

        // listBox1.
        this.listBox1.set_Location(new System.Drawing.Point(24,16));
        this.listBox1.set_Name("listBox1");
        this.listBox1.set_Size(new System.Drawing.Size(576, 277));
        this.listBox1.set_TabIndex(0);

        // ComponentClass.
        this.get_Controls().AddRange(new 
            System.Windows.Forms.Control[] {this.listBox1 });
        this.set_Name("ComponentClass");
        this.set_Size(new System.Drawing.Size(624, 320));
        this.ResumeLayout(false);
    } //InitializeComponent

    // This override allows the control to register event handlers for 
    // IComponentChangeService events
    // at the time the control is sited, which happens only in design mode.
    /** @property
     */
    public ISite get_Site()
    {
        return super.get_Site();
    } //get_Site

    /** @property 
     */
    public void set_Site(ISite value)
    {
        // Clear any component change event handlers.
        ClearChangeNotifications();

        // Set the new Site value.
        super.set_Site(value);
        m_changeService = (IComponentChangeService)
            GetService(IComponentChangeService.class.ToType());
        // Register event handlers for component change events.
        RegisterChangeNotifications();
    } //set_Site

    private void ClearChangeNotifications()
    {
        // The m_changeService value is null when not in design mode, 
        // as the IComponentChangeService is only available at design time.
        m_changeService = (IComponentChangeService)
            GetService(IComponentChangeService.class.ToType());

        // Clear our the component change events to prepare for re-siting.            
        if (m_changeService != null) {
            m_changeService.remove_ComponentChanged(new 
                ComponentChangedEventHandler(OnComponentChanged));
            m_changeService.remove_ComponentChanging(new 
                ComponentChangingEventHandler(OnComponentChanging));
            m_changeService.remove_ComponentAdded(new 
                ComponentEventHandler(OnComponentAdded));
            m_changeService.remove_ComponentAdding(new 
                ComponentEventHandler(OnComponentAdding));
            m_changeService.remove_ComponentRemoved(new 
                ComponentEventHandler(OnComponentRemoved));
            m_changeService.remove_ComponentRemoving(new 
                ComponentEventHandler(OnComponentRemoving));
            m_changeService.remove_ComponentRename(new 
                ComponentRenameEventHandler(OnComponentRename));
        }
    } //ClearChangeNotifications

    private void RegisterChangeNotifications()
    {
        // Register the event handlers for the IComponentChangeService events
        if (m_changeService != null) {
            m_changeService.add_ComponentChanged(new 
                ComponentChangedEventHandler(OnComponentChanged));
            m_changeService.add_ComponentChanging(new 
                ComponentChangingEventHandler(OnComponentChanging));
            m_changeService.add_ComponentAdded(new 
                ComponentEventHandler(OnComponentAdded));
            m_changeService.add_ComponentAdding(new 
                ComponentEventHandler(OnComponentAdding));
            m_changeService.add_ComponentRemoved(new 
                ComponentEventHandler(OnComponentRemoved));
            m_changeService.add_ComponentRemoving(new 
                ComponentEventHandler(OnComponentRemoving));
            m_changeService.add_ComponentRename(new 
                ComponentRenameEventHandler(OnComponentRename));
        }
    } //RegisterChangeNotifications

    /* This method handles the OnComponentChanged event to 
        // display a notification. 
     */

    private void OnComponentChanged(Object sender, ComponentChangedEventArgs ce)
    {
        if (ce.get_Component() != null && 
            ((IComponent)ce.get_Component()).get_Site() != null &&
            ce.get_Member() != null) {
            OnUserChange("The " + ce.get_Member().get_Name() 
                + " member of the " 
                + ((IComponent)ce.get_Component()).get_Site().get_Name() 
                + " component has been changed.");
        }
    } //OnComponentChanged

    /* This method handles the OnComponentChanging event to
        display a notification. 
     */
    private void OnComponentChanging(Object sender,
        ComponentChangingEventArgs ce)
    {
        if (ce.get_Component() != null && 
            ((IComponent)ce.get_Component()).get_Site() != null && 
            ce.get_Member() != null) {
            OnUserChange(("The " + ce.get_Member().get_Name() 
                + " member of the " 
                + ((IComponent)ce.get_Component()).get_Site().get_Name() 
                + " component is being changed."));
        }
    } //OnComponentChanging

    /* This method handles the OnComponentAdded event 
        to display a notification.
     */
    private void OnComponentAdded(Object sender, ComponentEventArgs ce)
    {
        OnUserChange("A component, " + ce.get_Component().get_Site().get_Name()
            + ", has been added.");
    } //OnComponentAdded

    /* This method handles the OnComponentAdding event 
        to display a notification. 
     */
    private void OnComponentAdding(Object sender, ComponentEventArgs ce)
    {
        OnUserChange("A component of type " 
            + ce.get_Component().GetType().get_FullName() 
            + " is being added.");
    } //OnComponentAdding

    /* This method handles the OnComponentRemoved event 
        to display a notification. 
     */
    private void OnComponentRemoved(Object sender, ComponentEventArgs ce)
    {
        OnUserChange("A component, " + ce.get_Component().get_Site().get_Name()
            + ", has been removed.");
    } //OnComponentRemoved

    /* This method handles the OnComponentRemoving event 
        to display a notification. 
     */
    private void OnComponentRemoving(Object sender, ComponentEventArgs ce)
    {
        OnUserChange("A component, " + ce.get_Component().get_Site().get_Name()
            + ", is being removed.");
    } //OnComponentRemoving

    /* This method handles the OnComponentRename event
        to display a notification.
     */
    private void OnComponentRename(Object sender, ComponentRenameEventArgs ce)
    {
        OnUserChange("A component, " + ce.get_OldName() + ", was renamed to " 
            + ce.get_NewName() + ".");
    } //OnComponentRename

    // This method adds a specified notification message
    // to the control's listbox.
    private void OnUserChange(String text)
    {
        listBox1.get_Items().Add(text);
    } //OnUserChange

    // Clean up any resources being used.
    protected void Dispose(boolean disposing)
    {
        if (disposing) {
            ClearChangeNotifications();
            if (components != null) {
                components.Dispose();
            }
        }
        super.Dispose(disposing);
    } //Dispose
} //ComponentClass

Plattformen

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 unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

IComponentChangeService-Member
System.ComponentModel.Design-Namespace
ComponentEventHandler-Delegat
ComponentChangedEventHandler-Delegat
ComponentChangingEventHandler-Delegat
ComponentRenameEventHandler-Delegat
MemberDescriptor-Klasse
DesignerTransaction-Klasse