IComponentChangeService 接口
提供一个接口来为添加、更改、移除或重命名组件的事件添加和移除事件处理程序，并提供方法来引发 ComponentChanged 或 ComponentChanging 事件。
**命名空间:**System.ComponentModel.Design
**程序集:**System（在 system.dll 中）
语法
声明
<ComVisibleAttribute(True)> _
Public Interface IComponentChangeService
用法
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
备注
IComponentChangeService 提供了一个接口，可用于指示对以下事件进行处理的方法：
ComponentAdded，在添加组件时引发。
ComponentAdding，在将要添加组件时引发。
ComponentChanged，在更改组件时引发。
ComponentChanging，在将要更改组件时引发。
ComponentRemoved，在移除组件时引发。
ComponentRemoving，在将要移除组件时引发。
ComponentRename，在重命名组件时引发。
通常，设计环境将为这些组件引发添加、更改、移除或重命名事件。当使用 DesignerTransaction 对象来为影响组件的设计时操作提供撤消和重复功能时，设计器应调用此接口的方法。文档中将提供有关 DesignerTransaction 的更多信息。通常，只有根设计器会处理这些更改通知。
此服务还提供引发组件已更改事件或组件正在更改事件的方法。PropertyDescriptor 或组件可以分别使用 OnComponentChanged 和 OnComponentChanging 方法来指示组件已更改或正在更改。
示例
下面的示例说明如何使用 IComponentChangeService 接口来接收有关在设计模式下添加、移除和更改组件的通知。
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
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
IComponentChangeService 成员
System.ComponentModel.Design 命名空间
ComponentEventHandler 委托
ComponentChangedEventHandler 委托
ComponentChangingEventHandler 委托
ComponentRenameEventHandler 委托
MemberDescriptor 类
DesignerTransaction 类