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Comment : implémenter le mode virtuel dans le contrôle DataGridView Windows Forms

L'exemple de code suivant illustre comment gérer de volumineux groupes de données à l'aide d'un contrôle DataGridView dont la propriété VirtualMode a la valeur true.

Pour obtenir une explication complète de cet exemple de code, consultez Procédure pas à pas : implémentation du mode virtuel dans le contrôle DataGridView Windows Forms.

Exemple

Imports System
Imports System.Windows.Forms

Public Class Form1
    Inherits Form

    Private WithEvents dataGridView1 As New DataGridView()

    ' Declare an ArrayList to serve as the data store. 
    Private customers As New System.Collections.ArrayList()

    ' Declare a Customer object to store data for a row being edited.
    Private customerInEdit As Customer

    ' Declare a variable to store the index of a row being edited. 
    ' A value of -1 indicates that there is no row currently in edit. 
    Private rowInEdit As Integer = -1

    ' Declare a variable to indicate the commit scope. 
    ' Set this value to false to use cell-level commit scope. 
    Private rowScopeCommit As Boolean = True

    <STAThreadAttribute()> _
    Public Shared Sub Main()
        Application.Run(New Form1())
    End Sub

    Public Sub New()
        ' Initialize the form.
        Me.dataGridView1.Dock = DockStyle.Fill
        Me.Controls.Add(Me.dataGridView1)
        Me.Text = "DataGridView virtual-mode demo (row-level commit scope)"
    End Sub

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) _
        Handles Me.Load

        ' Enable virtual mode.
        Me.dataGridView1.VirtualMode = True

        ' Add columns to the DataGridView.
        Dim companyNameColumn As New DataGridViewTextBoxColumn()
        With companyNameColumn
            .HeaderText = "Company Name"
            .Name = "Company Name"
        End With
        Dim contactNameColumn As New DataGridViewTextBoxColumn()
        With contactNameColumn
            .HeaderText = "Contact Name"
            .Name = "Contact Name"
        End With
        Me.dataGridView1.Columns.Add(companyNameColumn)
        Me.dataGridView1.Columns.Add(contactNameColumn)
        Me.dataGridView1.AutoSizeColumnsMode = _
            DataGridViewAutoSizeColumnsMode.AllCells

        ' Add some sample entries to the data store. 
        Me.customers.Add(New Customer("Bon app'", "Laurence Lebihan"))
        Me.customers.Add(New Customer("Bottom-Dollar Markets", _
            "Elizabeth Lincoln"))
        Me.customers.Add(New Customer("B's Beverages", "Victoria Ashworth"))

        ' Set the row count, including the row for new records.
        Me.dataGridView1.RowCount = 4

    End Sub

    Private Sub dataGridView1_CellValueNeeded(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.DataGridViewCellValueEventArgs) _
        Handles dataGridView1.CellValueNeeded

        ' If this is the row for new records, no values are needed.
        If e.RowIndex = Me.dataGridView1.RowCount - 1 Then
            Return
        End If

        Dim customerTmp As Customer = Nothing

        ' Store a reference to the Customer object for the row being painted.
        If e.RowIndex = rowInEdit Then
            customerTmp = Me.customerInEdit
        Else
            customerTmp = CType(Me.customers(e.RowIndex), Customer)
        End If

        ' Set the cell value to paint using the Customer object retrieved.
        Select Case Me.dataGridView1.Columns(e.ColumnIndex).Name
            Case "Company Name"
                e.Value = customerTmp.CompanyName

            Case "Contact Name"
                e.Value = customerTmp.ContactName
        End Select

    End Sub

    Private Sub dataGridView1_CellValuePushed(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.DataGridViewCellValueEventArgs) _
        Handles dataGridView1.CellValuePushed

        Dim customerTmp As Customer = Nothing

        ' Store a reference to the Customer object for the row being edited.
        If e.RowIndex < Me.customers.Count Then

            ' If the user is editing a new row, create a new Customer object.
            If Me.customerInEdit Is Nothing Then
                Me.customerInEdit = New Customer( _
                    CType(Me.customers(e.RowIndex), Customer).CompanyName, _
                    CType(Me.customers(e.RowIndex), Customer).ContactName)
            End If
            customerTmp = Me.customerInEdit
            Me.rowInEdit = e.RowIndex

        Else
            customerTmp = Me.customerInEdit
        End If

        ' Set the appropriate Customer property to the cell value entered.
        Dim newValue As String = TryCast(e.Value, String)
        Select Case Me.dataGridView1.Columns(e.ColumnIndex).Name
            Case "Company Name"
                customerTmp.CompanyName = newValue
            Case "Contact Name"
                customerTmp.ContactName = newValue
        End Select

    End Sub

    Private Sub dataGridView1_NewRowNeeded(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.DataGridViewRowEventArgs) _
        Handles dataGridView1.NewRowNeeded

        ' Create a new Customer object when the user edits
        ' the row for new records.
        Me.customerInEdit = New Customer()
        Me.rowInEdit = Me.dataGridView1.Rows.Count - 1

    End Sub

    Private Sub dataGridView1_RowValidated(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _
        Handles dataGridView1.RowValidated

        ' Save row changes if any were made and release the edited 
        ' Customer object if there is one.
        If e.RowIndex >= Me.customers.Count AndAlso _
            e.RowIndex <> Me.dataGridView1.Rows.Count - 1 Then

            ' Add the new Customer object to the data store.
            Me.customers.Add(Me.customerInEdit)
            Me.customerInEdit = Nothing
            Me.rowInEdit = -1

        ElseIf (Me.customerInEdit IsNot Nothing) AndAlso _
            e.RowIndex < Me.customers.Count Then

            ' Save the modified Customer object in the data store.
            Me.customers(e.RowIndex) = Me.customerInEdit
            Me.customerInEdit = Nothing
            Me.rowInEdit = -1

        ElseIf Me.dataGridView1.ContainsFocus Then

            Me.customerInEdit = Nothing
            Me.rowInEdit = -1

        End If

    End Sub

    Private Sub dataGridView1_RowDirtyStateNeeded(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.QuestionEventArgs) _
        Handles dataGridView1.RowDirtyStateNeeded

        If Not rowScopeCommit Then

            ' In cell-level commit scope, indicate whether the value
            ' of the current cell has been modified.
            e.Response = Me.dataGridView1.IsCurrentCellDirty

        End If

    End Sub

    Private Sub dataGridView1_CancelRowEdit(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.QuestionEventArgs) _
        Handles dataGridView1.CancelRowEdit

        If Me.rowInEdit = Me.dataGridView1.Rows.Count - 2 AndAlso _
            Me.rowInEdit = Me.customers.Count Then

            ' If the user has canceled the edit of a newly created row, 
            ' replace the corresponding Customer object with a new, empty one.
            Me.customerInEdit = New Customer()

        Else

            ' If the user has canceled the edit of an existing row, 
            ' release the corresponding Customer object.
            Me.customerInEdit = Nothing
            Me.rowInEdit = -1

        End If

    End Sub

    Private Sub dataGridView1_UserDeletingRow(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.DataGridViewRowCancelEventArgs) _
        Handles dataGridView1.UserDeletingRow

        If e.Row.Index < Me.customers.Count Then

            ' If the user has deleted an existing row, remove the 
            ' corresponding Customer object from the data store.
            Me.customers.RemoveAt(e.Row.Index)

        End If

        If e.Row.Index = Me.rowInEdit Then

            ' If the user has deleted a newly created row, release
            ' the corresponding Customer object. 
            Me.rowInEdit = -1
            Me.customerInEdit = Nothing

        End If

    End Sub

End Class

Public Class Customer

    Private companyNameValue As String
    Private contactNameValue As String

    Public Sub New()
        ' Leave fields empty.
    End Sub

    Public Sub New(ByVal companyName As String, ByVal contactName As String)
        companyNameValue = companyName
        contactNameValue = contactName
    End Sub

    Public Property CompanyName() As String
        Get
            Return companyNameValue
        End Get
        Set(ByVal value As String)
            companyNameValue = value
        End Set
    End Property

    Public Property ContactName() As String
        Get
            Return contactNameValue
        End Get
        Set(ByVal value As String)
            contactNameValue = value
        End Set
    End Property

End Class
using System;
using System.Windows.Forms;

public class Form1 : Form
{
    private DataGridView dataGridView1 = new DataGridView();

    // Declare an ArrayList to serve as the data store. 
    private System.Collections.ArrayList customers =
        new System.Collections.ArrayList();

    // Declare a Customer object to store data for a row being edited.
    private Customer customerInEdit;

    // Declare a variable to store the index of a row being edited. 
    // A value of -1 indicates that there is no row currently in edit. 
    private int rowInEdit = -1;

    // Declare a variable to indicate the commit scope. 
    // Set this value to false to use cell-level commit scope. 
    private bool rowScopeCommit = true;

    [STAThreadAttribute()]
    public static void Main()
    {
        Application.Run(new Form1());
    }

    public Form1()
    {
        // Initialize the form.
        this.dataGridView1.Dock = DockStyle.Fill;
        this.Controls.Add(this.dataGridView1);
        this.Load += new EventHandler(Form1_Load);
        this.Text = "DataGridView virtual-mode demo (row-level commit scope)";
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        // Enable virtual mode.
        this.dataGridView1.VirtualMode = true;

        // Connect the virtual-mode events to event handlers. 
        this.dataGridView1.CellValueNeeded += new
            DataGridViewCellValueEventHandler(dataGridView1_CellValueNeeded);
        this.dataGridView1.CellValuePushed += new
            DataGridViewCellValueEventHandler(dataGridView1_CellValuePushed);
        this.dataGridView1.NewRowNeeded += new
            DataGridViewRowEventHandler(dataGridView1_NewRowNeeded);
        this.dataGridView1.RowValidated += new
            DataGridViewCellEventHandler(dataGridView1_RowValidated);
        this.dataGridView1.RowDirtyStateNeeded += new
            QuestionEventHandler(dataGridView1_RowDirtyStateNeeded);
        this.dataGridView1.CancelRowEdit += new
            QuestionEventHandler(dataGridView1_CancelRowEdit);
        this.dataGridView1.UserDeletingRow += new
            DataGridViewRowCancelEventHandler(dataGridView1_UserDeletingRow);

        // Add columns to the DataGridView.
        DataGridViewTextBoxColumn companyNameColumn = new
            DataGridViewTextBoxColumn();
        companyNameColumn.HeaderText = "Company Name";
        companyNameColumn.Name = "Company Name";
        DataGridViewTextBoxColumn contactNameColumn = new
            DataGridViewTextBoxColumn();
        contactNameColumn.HeaderText = "Contact Name";
        contactNameColumn.Name = "Contact Name";
        this.dataGridView1.Columns.Add(companyNameColumn);
        this.dataGridView1.Columns.Add(contactNameColumn);
        this.dataGridView1.AutoSizeColumnsMode = 
            DataGridViewAutoSizeColumnsMode.AllCells;

        // Add some sample entries to the data store. 
        this.customers.Add(new Customer(
            "Bon app'", "Laurence Lebihan"));
        this.customers.Add(new Customer(
            "Bottom-Dollar Markets", "Elizabeth Lincoln"));
        this.customers.Add(new Customer(
            "B's Beverages", "Victoria Ashworth"));

        // Set the row count, including the row for new records.
        this.dataGridView1.RowCount = 4;
    }

    private void dataGridView1_CellValueNeeded(object sender,
        System.Windows.Forms.DataGridViewCellValueEventArgs e)
    {
        // If this is the row for new records, no values are needed.
        if (e.RowIndex == this.dataGridView1.RowCount - 1) return;

        Customer customerTmp = null;

        // Store a reference to the Customer object for the row being painted.
        if (e.RowIndex == rowInEdit)
        {
            customerTmp = this.customerInEdit;
        }
        else 
        {
            customerTmp = (Customer)this.customers[e.RowIndex];
        }

        // Set the cell value to paint using the Customer object retrieved.
        switch (this.dataGridView1.Columns[e.ColumnIndex].Name)
        {
            case "Company Name":
                e.Value = customerTmp.CompanyName;
                break;

            case "Contact Name":
                e.Value = customerTmp.ContactName;
                break;
        }
    }

    private void dataGridView1_CellValuePushed(object sender,
        System.Windows.Forms.DataGridViewCellValueEventArgs e)
    {
        Customer customerTmp = null;

        // Store a reference to the Customer object for the row being edited.
        if (e.RowIndex < this.customers.Count)
        {
            // If the user is editing a new row, create a new Customer object.
            if (this.customerInEdit == null)
            {
                this.customerInEdit = new Customer(
                    ((Customer)this.customers[e.RowIndex]).CompanyName,
                    ((Customer)this.customers[e.RowIndex]).ContactName);
            }
            customerTmp = this.customerInEdit;
            this.rowInEdit = e.RowIndex;
        }
        else
        {
            customerTmp = this.customerInEdit;
        }

        // Set the appropriate Customer property to the cell value entered.
        String newValue = e.Value as String;
        switch (this.dataGridView1.Columns[e.ColumnIndex].Name)
        {
            case "Company Name":
                customerTmp.CompanyName = newValue;
                break;

            case "Contact Name":
                customerTmp.ContactName = newValue;
                break;
        }
    }

    private void dataGridView1_NewRowNeeded(object sender,
        System.Windows.Forms.DataGridViewRowEventArgs e)
    {
        // Create a new Customer object when the user edits
        // the row for new records.
        this.customerInEdit = new Customer();
        this.rowInEdit = this.dataGridView1.Rows.Count - 1;
    }

    private void dataGridView1_RowValidated(object sender,
        System.Windows.Forms.DataGridViewCellEventArgs e)
    {
        // Save row changes if any were made and release the edited 
        // Customer object if there is one.
        if (e.RowIndex >= this.customers.Count &&
            e.RowIndex != this.dataGridView1.Rows.Count - 1)
        {
            // Add the new Customer object to the data store.
            this.customers.Add(this.customerInEdit);
            this.customerInEdit = null;
            this.rowInEdit = -1;
        }
        else if (this.customerInEdit != null &&
            e.RowIndex < this.customers.Count)
        {
            // Save the modified Customer object in the data store.
            this.customers[e.RowIndex] = this.customerInEdit;
            this.customerInEdit = null;
            this.rowInEdit = -1;
        }
        else if (this.dataGridView1.ContainsFocus)
        {
            this.customerInEdit = null;
            this.rowInEdit = -1;
        }
    }

    private void dataGridView1_RowDirtyStateNeeded(object sender,
        System.Windows.Forms.QuestionEventArgs e)
    {
        if (!rowScopeCommit)
        {
            // In cell-level commit scope, indicate whether the value
            // of the current cell has been modified.
            e.Response = this.dataGridView1.IsCurrentCellDirty;
        }
    }

    private void dataGridView1_CancelRowEdit(object sender,
        System.Windows.Forms.QuestionEventArgs e)
    {
        if (this.rowInEdit == this.dataGridView1.Rows.Count - 2 &&
            this.rowInEdit == this.customers.Count)
        {
            // If the user has canceled the edit of a newly created row, 
            // replace the corresponding Customer object with a new, empty one.
            this.customerInEdit = new Customer();
        }
        else
        {
            // If the user has canceled the edit of an existing row, 
            // release the corresponding Customer object.
            this.customerInEdit = null;
            this.rowInEdit = -1;
        }
    }

    private void dataGridView1_UserDeletingRow(object sender,
        System.Windows.Forms.DataGridViewRowCancelEventArgs e)
    {
        if (e.Row.Index < this.customers.Count)
        {
            // If the user has deleted an existing row, remove the 
            // corresponding Customer object from the data store.
            this.customers.RemoveAt(e.Row.Index);
        }

        if (e.Row.Index == this.rowInEdit)
        {
            // If the user has deleted a newly created row, release
            // the corresponding Customer object. 
            this.rowInEdit = -1;
            this.customerInEdit = null;
        }
    }
}

public class Customer
{
    private String companyNameValue;
    private String contactNameValue;

    public Customer()
    {
        // Leave fields empty.
    }

    public Customer(String companyName, String contactName)
    {
        companyNameValue = companyName;
        contactNameValue = contactName;
    }

    public String CompanyName
    {
        get
        {
            return companyNameValue;
        }
        set
        {
            companyNameValue = value;
        }
    }

    public String ContactName
    {
        get
        {
            return contactNameValue;
        }
        set
        {
            contactNameValue = value;
        }
    }
}
#using <System.Drawing.dll>
#using <System.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Windows::Forms;

public ref class Customer
{
private:
   String^ companyNameValue;
   String^ contactNameValue;

public:
   Customer()
   {

      // Leave fields empty.
   }

   Customer( String^ companyName, String^ contactName )
   {
      companyNameValue = companyName;
      contactNameValue = contactName;
   }


   property String^ CompanyName 
   {
      String^ get()
      {
         return companyNameValue;
      }

      void set( String^ value )
      {
         companyNameValue = value;
      }

   }

   property String^ ContactName 
   {
      String^ get()
      {
         return contactNameValue;
      }

      void set( String^ value )
      {
         contactNameValue = value;
      }

   }

};

public ref class Form1: public Form
{
private:
   DataGridView^ dataGridView1;

   // Declare an ArrayList to serve as the data store. 
   System::Collections::ArrayList^ customers;

   // Declare a Customer object to store data for a row being edited.
   Customer^ customerInEdit;

   // Declare a variable to store the index of a row being edited. 
   // A value of -1 indicates that there is no row currently in edit. 
   int rowInEdit;

   // Declare a variable to indicate the commit scope. 
   // Set this value to false to use cell-level commit scope. 
   bool rowScopeCommit;

public:
   static void Main()
   {
      Application::Run( gcnew Form1 );
   }

   Form1()
   {
      dataGridView1 = gcnew DataGridView;
      customers = gcnew System::Collections::ArrayList;
      rowInEdit = -1;
      rowScopeCommit = true;

      // Initialize the form.
      this->dataGridView1->Dock = DockStyle::Fill;
      this->Controls->Add( this->dataGridView1 );
      this->Load += gcnew EventHandler( this, &Form1::Form1_Load );
   }

private:
   void Form1_Load( Object^ /*sender*/, EventArgs^ /*e*/ )
   {

      // Enable virtual mode.
      this->dataGridView1->VirtualMode = true;

      // Connect the virtual-mode events to event handlers. 
      this->dataGridView1->CellValueNeeded += gcnew
          DataGridViewCellValueEventHandler( this, &Form1::dataGridView1_CellValueNeeded );
      this->dataGridView1->CellValuePushed += gcnew
          DataGridViewCellValueEventHandler( this, &Form1::dataGridView1_CellValuePushed );
      this->dataGridView1->NewRowNeeded += gcnew
          DataGridViewRowEventHandler( this, &Form1::dataGridView1_NewRowNeeded );
      this->dataGridView1->RowValidated += gcnew
          DataGridViewCellEventHandler( this, &Form1::dataGridView1_RowValidated );
      this->dataGridView1->RowDirtyStateNeeded += gcnew
          QuestionEventHandler( this, &Form1::dataGridView1_RowDirtyStateNeeded );
      this->dataGridView1->CancelRowEdit += gcnew
          QuestionEventHandler( this, &Form1::dataGridView1_CancelRowEdit );
      this->dataGridView1->UserDeletingRow += gcnew
          DataGridViewRowCancelEventHandler( this, &Form1::dataGridView1_UserDeletingRow );

      // Add columns to the DataGridView.
      DataGridViewTextBoxColumn^ companyNameColumn = gcnew DataGridViewTextBoxColumn;
      companyNameColumn->HeaderText = L"Company Name";
      companyNameColumn->Name = L"Company Name";
      DataGridViewTextBoxColumn^ contactNameColumn = gcnew DataGridViewTextBoxColumn;
      contactNameColumn->HeaderText = L"Contact Name";
      contactNameColumn->Name = L"Contact Name";
      this->dataGridView1->Columns->Add( companyNameColumn );
      this->dataGridView1->Columns->Add( contactNameColumn );
      this->dataGridView1->AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode::AllCells;

      // Add some sample entries to the data store. 
      this->customers->Add( gcnew Customer( L"Bon app'",L"Laurence Lebihan" ) );
      this->customers->Add( gcnew Customer( L"Bottom-Dollar Markets",L"Elizabeth Lincoln" ) );
      this->customers->Add( gcnew Customer( L"B's Beverages",L"Victoria Ashworth" ) );

      // Set the row count, including the row for new records.
      this->dataGridView1->RowCount = 4;
   }

   void dataGridView1_CellValueNeeded( Object^ /*sender*/,
       System::Windows::Forms::DataGridViewCellValueEventArgs^ e )
   {
      Customer^ customerTmp = nullptr;

      // Store a reference to the Customer object for the row being painted.
      if ( e->RowIndex == rowInEdit )
      {
         customerTmp = this->customerInEdit;
      }
      else
      {
         customerTmp = dynamic_cast<Customer^>(this->customers[ e->RowIndex ]);
      }

      // Set the cell value to paint using the Customer object retrieved.
      int switchcase = 0;
      if ( (this->dataGridView1->Columns[ e->ColumnIndex ]->Name)->Equals( L"Company Name" ) )
            switchcase = 1;
      else
      if ( (this->dataGridView1->Columns[ e->ColumnIndex ]->Name)->Equals( L"Contact Name" ) )
            switchcase = 2;


      switch ( switchcase )
      {
         case 1:
            e->Value = customerTmp->CompanyName;
            break;

         case 2:
            e->Value = customerTmp->ContactName;
            break;
      }
   }


   void dataGridView1_CellValuePushed( Object^ /*sender*/,
       System::Windows::Forms::DataGridViewCellValueEventArgs^ e )
   {
      Customer^ customerTmp = nullptr;

      // Store a reference to the Customer object for the row being edited.
      if ( e->RowIndex < this->customers->Count )
      {

         // If the user is editing a new row, create a new Customer object.
         if ( this->customerInEdit == nullptr )
         {
            this->customerInEdit = gcnew Customer(
                (dynamic_cast<Customer^>(this->customers[ e->RowIndex ]))->CompanyName,
                (dynamic_cast<Customer^>(this->customers[ e->RowIndex ])->ContactName) );
         }

         customerTmp = this->customerInEdit;
         this->rowInEdit = e->RowIndex;
      }
      else
      {
         customerTmp = this->customerInEdit;
      }


      // Set the appropriate Customer property to the cell value entered.
      int switchcase = 0;
      if ( (this->dataGridView1->Columns[ e->ColumnIndex ]->Name)->Equals( L"Company Name" ) )
            switchcase = 1;
      else
      if ( (this->dataGridView1->Columns[ e->ColumnIndex ]->Name)->Equals( L"Contact Name" ) )
            switchcase = 2;


      switch ( switchcase )
      {
         case 1:
            customerTmp->CompanyName = dynamic_cast<String^>(e->Value);
            break;

         case 2:
            customerTmp->ContactName = dynamic_cast<String^>(e->Value);
            break;
      }
   }


   void dataGridView1_NewRowNeeded( Object^ /*sender*/,
       System::Windows::Forms::DataGridViewRowEventArgs^ /*e*/ )
   {

      // Create a new Customer object when the user edits
      // the row for new records.
      this->customerInEdit = gcnew Customer;
      this->rowInEdit = this->dataGridView1->Rows->Count - 1;
   }


   void dataGridView1_RowValidated( Object^ /*sender*/,
       System::Windows::Forms::DataGridViewCellEventArgs^ e )
   {

      // Save row changes if any were made and release the edited 
      // Customer object if there is one.
      if ( e->RowIndex >= this->customers->Count && e->RowIndex != this->dataGridView1->Rows->Count - 1 )
      {

         // Add the new Customer object to the data store.
         this->customers->Add( this->customerInEdit );
         this->customerInEdit = nullptr;
         this->rowInEdit = -1;
      }
      else
      if ( this->customerInEdit != nullptr && e->RowIndex < this->customers->Count )
      {

         // Save the modified Customer object in the data store.
         this->customers[ e->RowIndex ] = this->customerInEdit;
         this->customerInEdit = nullptr;
         this->rowInEdit = -1;
      }
      else
      if ( this->dataGridView1->ContainsFocus )
      {
         this->customerInEdit = nullptr;
         this->rowInEdit = -1;
      }
   }


   void dataGridView1_RowDirtyStateNeeded( Object^ /*sender*/,
       System::Windows::Forms::QuestionEventArgs^ e )
   {
      if (  !rowScopeCommit )
      {

         // In cell-level commit scope, indicate whether the value
         // of the current cell has been modified.
         e->Response = this->dataGridView1->IsCurrentCellDirty;
      }
   }


   void dataGridView1_CancelRowEdit( Object^ /*sender*/,
       System::Windows::Forms::QuestionEventArgs^ /*e*/ )
   {
      if ( this->rowInEdit == this->dataGridView1->Rows->Count - 2 &&
           this->rowInEdit == this->customers->Count )
      {

         // If the user has canceled the edit of a newly created row, 
         // replace the corresponding Customer object with a new, empty one.
         this->customerInEdit = gcnew Customer;
      }
      else
      {

         // If the user has canceled the edit of an existing row, 
         // release the corresponding Customer object.
         this->customerInEdit = nullptr;
         this->rowInEdit = -1;
      }
   }


   void dataGridView1_UserDeletingRow( Object^ /*sender*/,
       System::Windows::Forms::DataGridViewRowCancelEventArgs^ e )
   {
      if ( e->Row->Index < this->customers->Count )
      {

         // If the user has deleted an existing row, remove the 
         // corresponding Customer object from the data store.
         this->customers->RemoveAt( e->Row->Index );
      }

      if ( e->Row->Index == this->rowInEdit )
      {

         // If the user has deleted a newly created row, release
         // the corresponding Customer object. 
         this->rowInEdit = -1;
         this->customerInEdit = nullptr;
      }
   }
};

int main()
{
   Form1::Main();
}


Compilation du code

Cet exemple nécessite les éléments suivants :

  • Références aux assemblys System 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

Procédure pas à pas : implémentation du mode virtuel dans le contrôle DataGridView Windows Forms

Référence

DataGridView

VirtualMode

CellValueNeeded

CellValuePushed

NewRowNeeded

RowValidated

RowDirtyStateNeeded

CancelRowEdit

UserDeletingRow

Concepts

Mode virtuel dans le contrôle DataGridView Windows Forms

Autres ressources

Réglage des performances dans le contrôle DataGridView Windows Forms