IEventBindingService Antarmuka
Definisi
Penting
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Menyediakan layanan untuk mendaftarkan penanganan aktivitas untuk peristiwa komponen.
public interface class IEventBindingServicepublic interface IEventBindingService[System.Runtime.InteropServices.ComVisible(true)]
public interface IEventBindingServicetype IEventBindingService = interface[<System.Runtime.InteropServices.ComVisible(true)>]
type IEventBindingService = interfacePublic Interface IEventBindingService- Turunan
- Atribut
Contoh
Contoh berikut menunjukkan perancang yang menggunakan IEventBindingService untuk menautkan peristiwa komponen dengan penanganan aktivitas pada waktu desain saat perintah menu pintasan kustom yang ditambahkan perancang untuk komponen dipanggil. Untuk menggunakan contoh, kompilasi ke pustaka kelas, tambahkan referensi dari proyek Formulir Windows, tambahkan komponen di pustaka kelas ke Kotak Alat dengan mengklik kanan Kotak Alat dan memilih Sesuaikan Kotak Alat, lalu pilih pustaka kelas dan klik OK, dan tambahkan instans EventControl ke Formulir. Lalu klik kanan EventControl dan klik perintah sambungkan menu pintasan testEvent. Metode penanganan aktivitas kosong dibuat dan metode testEvent EventControl diinisialisasi ke penanganan aktivitas ini dalam kode inisialisasi untuk Formulir.
#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
Keterangan
Layanan pengikatan peristiwa menyediakan cara untuk menautkan penanganan aktivitas dengan peristiwa komponen dari kode perancang.
Untuk menautkan penanganan aktivitas dengan peristiwa komponen menggunakan IEventBindingService, Anda harus terlebih dahulu mendapatkan EventDescriptor untuk peristiwa komponen yang ingin Anda tautkan. IEventBindingService menyediakan metode yang dapat mengonversi EventDescriptor ke yang PropertyDescriptor dapat Anda gunakan untuk mengonfigurasi peristiwa dengan nama metode penanganan aktivitas.
Objek TypeDescriptor menyediakan GetEvents metode yang dapat Anda gunakan untuk mendapatkan objek yang EventDescriptorCollection berisi EventDescriptor untuk setiap peristiwa komponen. Metode GetEventProperty dan GetEventProperties dari IEventBindingService pengembalian a PropertyDescriptor untuk masing-masing EventDescriptor diteruskan ke salah satu metode. Setiap PropertyDescriptor yang dikembalikan dari GetEventProperty atau GetEventProperties memiliki jenis string properti. Anda dapat mengatur string ini ke nilai yang menunjukkan nama metode penanganan aktivitas untuk menautkan peristiwa dengan menggunakan SetValue metode .PropertyDescriptor
Metode
| CreateUniqueMethodName(IComponent, EventDescriptor) |
Membuat nama unik untuk metode penanganan aktivitas untuk komponen dan peristiwa yang ditentukan. |
| GetCompatibleMethods(EventDescriptor) |
Mendapatkan kumpulan metode penanganan aktivitas yang memiliki tanda tangan metode yang kompatibel dengan peristiwa yang ditentukan. |
| GetEvent(PropertyDescriptor) |
EventDescriptor Mendapatkan untuk peristiwa yang diwakili deskriptor properti yang ditentukan, jika mewakili peristiwa. |
| GetEventProperties(EventDescriptorCollection) |
Mengonversi sekumpulan deskriptor peristiwa menjadi sekumpulan deskriptor properti. |
| GetEventProperty(EventDescriptor) |
Mengonversi deskriptor peristiwa tunggal menjadi deskriptor properti. |
| ShowCode() |
Menampilkan kode pengguna untuk perancang. |
| ShowCode(IComponent, EventDescriptor) |
Menampilkan kode pengguna untuk peristiwa yang ditentukan. |
| ShowCode(Int32) |
Menampilkan kode pengguna untuk perancang pada baris yang ditentukan. |
Berlaku untuk
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