Comment : générer des notifications de modifications à l'aide de la méthode ResetItem de BindingSource
Certaines sources de données de vos contrôles ne déclenchent pas de notification de modifications lorsque les éléments sont modifiés, ajoutés ou supprimés. Grâce au composant BindingSource, vous pouvez lier ces sources de données et déclencher une notification de modifications à partir de votre code.
Exemple
Ce formulaire montre l'utilisation d'un composant BindingSource pour lier une liste à un contrôle DataGridView. La liste ne déclenche pas de notification de modifications ; par conséquent, la méthode ResetItem appliquée à BindingSource est appelée lorsqu'un élément de la liste est modifié. .
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Diagnostics
Imports System.Drawing
Imports System.Windows.Forms
' This form demonstrates using a BindingSource to bind
' a list to a DataGridView control. The list does not
' raise change notifications, so the ResetItem method
' on the BindingSource is used.
Public Class Form1
Inherits System.Windows.Forms.Form
' This button causes the value of a list element to be changed.
Private WithEvents changeItemBtn As New Button()
' This is the DataGridView control that displays the contents
' of the list.
Private customersDataGridView As New DataGridView()
' This is the BindingSource used to bind the list to the
' DataGridView control.
Private WithEvents customersBindingSource As New BindingSource()
Public Sub New()
' Set up the "Change Item" button.
Me.changeItemBtn.Text = "Change Item"
Me.changeItemBtn.Dock = DockStyle.Bottom
Me.Controls.Add(Me.changeItemBtn)
' Set up the DataGridView.
customersDataGridView.Dock = DockStyle.Top
Me.Controls.Add(customersDataGridView)
Me.Size = New Size(800, 200)
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Me.Load
' Create and populate the list of DemoCustomer objects
' which will supply data to the DataGridView.
Dim customerList As List(Of DemoCustomer) = _
New List(Of DemoCustomer)
customerList.Add(DemoCustomer.CreateNewCustomer())
customerList.Add(DemoCustomer.CreateNewCustomer())
customerList.Add(DemoCustomer.CreateNewCustomer())
' Bind the list to the BindingSource.
Me.customersBindingSource.DataSource = customerList
' Attach the BindingSource to the DataGridView.
Me.customersDataGridView.DataSource = Me.customersBindingSource
End Sub
' This event handler changes the value of the CompanyName
' property for the first item in the list.
Private Sub changeItemBtn_Click(ByVal sender As Object, ByVal e As EventArgs) _
Handles changeItemBtn.Click
' Get a reference to the list from the BindingSource.
Dim customerList As List(Of DemoCustomer) = _
CType(Me.customersBindingSource.DataSource, List(Of DemoCustomer))
' Change the value of the CompanyName property for the
' first item in the list.
customerList(0).CompanyName = "Tailspin Toys"
' Call ResetItem to alert the BindingSource that the
' list has changed.
Me.customersBindingSource.ResetItem(0)
End Sub
<STAThread()> _
Shared Sub Main()
Application.EnableVisualStyles()
Application.Run(New Form1())
End Sub
End Class
' This class implements a simple customer type.
Public Class DemoCustomer
' These fields hold the values for the public properties.
Private idValue As Guid = Guid.NewGuid()
Private customerName As String = String.Empty
Private companyNameValue As String = String.Empty
Private phoneNumberValue As String = String.Empty
' The constructor is private to enforce the factory pattern.
Private Sub New()
customerName = "no data"
companyNameValue = "no data"
phoneNumberValue = "no data"
End Sub
' This is the public factory method.
Public Shared Function CreateNewCustomer() As DemoCustomer
Return New DemoCustomer()
End Function
' This property represents an ID, suitable
' for use as a primary key in a database.
Public ReadOnly Property ID() As Guid
Get
Return Me.idValue
End Get
End Property
Public Property CompanyName() As String
Get
Return Me.companyNameValue
End Get
Set(ByVal value As String)
Me.companyNameValue = Value
End Set
End Property
Public Property PhoneNumber() As String
Get
Return Me.phoneNumberValue
End Get
Set(ByVal value As String)
Me.phoneNumberValue = Value
End Set
End Property
End Class
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Diagnostics;
using System.Drawing;
using System.Data.SqlClient;
using System.Windows.Forms;
// This form demonstrates using a BindingSource to bind
// a list to a DataGridView control. The list does not
// raise change notifications, so the ResetItem method
// on the BindingSource is used.
public class Form1 : System.Windows.Forms.Form
{
// This button causes the value of a list element to be changed.
private Button changeItemBtn = new Button();
// This is the DataGridView control that displays the contents
// of the list.
private DataGridView customersDataGridView = new DataGridView();
// This is the BindingSource used to bind the list to the
// DataGridView control.
private BindingSource customersBindingSource = new BindingSource();
public Form1()
{
// Set up the "Change Item" button.
this.changeItemBtn.Text = "Change Item";
this.changeItemBtn.Dock = DockStyle.Bottom;
this.changeItemBtn.Click +=
new EventHandler(changeItemBtn_Click);
this.Controls.Add(this.changeItemBtn);
// Set up the DataGridView.
customersDataGridView.Dock = DockStyle.Top;
this.Controls.Add(customersDataGridView);
this.Size = new Size(800, 200);
this.Load += new EventHandler(Form1_Load);
}
private void Form1_Load(System.Object sender, System.EventArgs e)
{
// Create and populate the list of DemoCustomer objects
// which will supply data to the DataGridView.
List<DemoCustomer> customerList = new List<DemoCustomer>();
customerList.Add(DemoCustomer.CreateNewCustomer());
customerList.Add(DemoCustomer.CreateNewCustomer());
customerList.Add(DemoCustomer.CreateNewCustomer());
// Bind the list to the BindingSource.
this.customersBindingSource.DataSource = customerList;
// Attach the BindingSource to the DataGridView.
this.customersDataGridView.DataSource =
this.customersBindingSource;
}
// This event handler changes the value of the CompanyName
// property for the first item in the list.
void changeItemBtn_Click(object sender, EventArgs e)
{
// Get a reference to the list from the BindingSource.
List<DemoCustomer> customerList =
this.customersBindingSource.DataSource as List<DemoCustomer>;
// Change the value of the CompanyName property for the
// first item in the list.
customerList[0].CompanyName = "Tailspin Toys";
// Call ResetItem to alert the BindingSource that the
// list has changed.
this.customersBindingSource.ResetItem(0);
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}
// This class implements a simple customer type.
public class DemoCustomer
{
// These fields hold the values for the public properties.
private Guid idValue = Guid.NewGuid();
private string customerName = String.Empty;
private string companyNameValue = String.Empty;
private string phoneNumberValue = String.Empty;
// The constructor is private to enforce the factory pattern.
private DemoCustomer()
{
customerName = "no data";
companyNameValue = "no data";
phoneNumberValue = "no data";
}
// This is the public factory method.
public static DemoCustomer CreateNewCustomer()
{
return new DemoCustomer();
}
// This property represents an ID, suitable
// for use as a primary key in a database.
public Guid ID
{
get
{
return this.idValue;
}
}
public string CompanyName
{
get
{
return this.companyNameValue;
}
set
{
this.companyNameValue = value;
}
}
public string PhoneNumber
{
get
{
return this.phoneNumberValue;
}
set
{
this.phoneNumberValue = value;
}
}
}
#using <System.dll>
#using <System.Data.dll>
#using <System.Drawing.dll>
#using <System.EnterpriseServices.dll>
#using <System.Transactions.dll>
#using <System.Windows.Forms.dll>
#using <System.Xml.dll>
using namespace System;
using namespace System::Collections::Generic;
using namespace System::ComponentModel;
using namespace System::Data;
using namespace System::Data::Common;
using namespace System::Data::SqlClient;
using namespace System::Diagnostics;
using namespace System::Drawing;
using namespace System::Windows::Forms;
// This class implements a simple customer type.
public ref class DemoCustomer
{
private:
// These fields hold the values for the public properties.
Guid idValue;
String^ customerName;
String^ companyNameValue;
String^ phoneNumberValue;
// The constructor is private to enforce the factory pattern.
DemoCustomer()
{
idValue = Guid::NewGuid();
customerName = L"no data";
companyNameValue = L"no data";
phoneNumberValue = L"no data";
}
public:
// This is the public factory method.
static DemoCustomer^ CreateNewCustomer()
{
return gcnew DemoCustomer;
}
property Guid ID
{
// This property represents an ID, suitable
// for use as a primary key in a database.
Guid get()
{
return this->idValue;
}
}
property String^ CompanyName
{
String^ get()
{
return this->companyNameValue;
}
void set( String^ value )
{
this->companyNameValue = value;
}
}
property String^ PhoneNumber
{
String^ get()
{
return this->phoneNumberValue;
}
void set( String^ value )
{
this->phoneNumberValue = value;
}
}
};
// This form demonstrates using a BindingSource to bind
// a list to a DataGridView control. The list does not
// raise change notifications, so the ResetItem method
// on the BindingSource is used.
public ref class Form1: public System::Windows::Forms::Form
{
private:
// This button causes the value of a list element to be changed.
Button^ changeItemBtn;
// This is the DataGridView control that displays the contents
// of the list.
DataGridView^ customersDataGridView;
// This is the BindingSource used to bind the list to the
// DataGridView control.
BindingSource^ customersBindingSource;
public:
Form1()
{
changeItemBtn = gcnew Button;
customersDataGridView = gcnew DataGridView;
customersBindingSource = gcnew BindingSource;
// Set up the "Change Item" button.
this->changeItemBtn->Text = L"Change Item";
this->changeItemBtn->Dock = DockStyle::Bottom;
this->changeItemBtn->Click += gcnew EventHandler(
this, &Form1::changeItemBtn_Click );
this->Controls->Add( this->changeItemBtn );
// Set up the DataGridView.
customersDataGridView->Dock = DockStyle::Top;
this->Controls->Add( customersDataGridView );
this->Size = System::Drawing::Size( 800, 200 );
this->Load += gcnew EventHandler( this, &Form1::Form1_Load );
}
private:
void Form1_Load( Object^ /*sender*/, EventArgs^ /*e*/ )
{
// Create and populate the list of DemoCustomer objects
// which will supply data to the DataGridView.
List< DemoCustomer^ >^ customerList = gcnew List< DemoCustomer^ >;
customerList->Add( DemoCustomer::CreateNewCustomer() );
customerList->Add( DemoCustomer::CreateNewCustomer() );
customerList->Add( DemoCustomer::CreateNewCustomer() );
// Bind the list to the BindingSource.
this->customersBindingSource->DataSource = customerList;
// Attach the BindingSource to the DataGridView.
this->customersDataGridView->DataSource =
this->customersBindingSource;
}
// This event handler changes the value of the CompanyName
// property for the first item in the list.
void changeItemBtn_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
{
// Get a reference to the list from the BindingSource.
List< DemoCustomer^ >^ customerList =
static_cast<List< DemoCustomer^ >^>(
this->customersBindingSource->DataSource);
// Change the value of the CompanyName property for the
// first item in the list.
customerList->default[ 0 ]->CompanyName = L"Tailspin Toys";
// Call ResetItem to alert the BindingSource that the
// list has changed.
this->customersBindingSource->ResetItem( 0 );
}
};
int main()
{
Application::EnableVisualStyles();
Application::Run( gcnew Form1 );
}
Compilation du code
Cet exemple nécessite les actions ou les éléments suivants :
- Références aux assemblys System, System.Data, System.Drawing et System.Windows.Forms.
Pour plus d'informations sur la génération de cet exemple à partir de la ligne de commande pour Visual Basic ou Visual C#, consultez Génération à partir de la ligne de commande (Visual Basic) ou Génération à partir de la ligne de commande avec csc.exe. Vous pouvez aussi générer cet exemple dans Visual Studio en collant le code dans un nouveau projet. Pour plus d'informations, consultez Comment : compiler et exécuter un exemple complet de code Windows Forms à l'aide de Visual Studio et Comment : compiler et exécuter un exemple complet de code Windows Forms à l'aide de Visual Studio et Comment : compiler et exécuter un exemple complet de code Windows Forms à l'aide de Visual Studio et Comment : compiler et exécuter un exemple complet de code Windows Forms à l'aide de Visual Studio et Comment : compiler et exécuter un exemple complet de code Windows Forms à l'aide de Visual Studio.
Voir aussi
Tâches
Comment : lier un contrôle Windows Forms à un type