DataGridView.CellValueChanged Événement

Définition

Se produit lorsque la valeur d'une cellule change.Occurs when the value of a cell changes.

public:
 event System::Windows::Forms::DataGridViewCellEventHandler ^ CellValueChanged;
public event System.Windows.Forms.DataGridViewCellEventHandler CellValueChanged;
member this.CellValueChanged : System.Windows.Forms.DataGridViewCellEventHandler 
Public Custom Event CellValueChanged As DataGridViewCellEventHandler 

Exemples

L’exemple de code suivant montre comment utiliser l’événement CellValueChanged pour mettre à jour les valeurs dans une colonne de solde d’une DataGridView.The following code example demonstrates how to use the CellValueChanged event to update the values in a balance column of a DataGridView. Cet exemple fait partie d’un exemple plus complet disponible dans l’événement SelectionChanged.This example is part of a larger example available in the SelectionChanged event.

private void DataGridView1_CellValueChanged(
    object sender, DataGridViewCellEventArgs e)
{
    // Update the balance column whenever the value of any cell changes.
    UpdateBalance();
}

private void DataGridView1_RowsRemoved(
    object sender, DataGridViewRowsRemovedEventArgs e)
{
    // Update the balance column whenever rows are deleted.
    UpdateBalance();
}

private void UpdateBalance()
{
    int counter;
    int balance;
    int deposit;
    int withdrawal;

    // Iterate through the rows, skipping the Starting Balance row.
    for (counter = 1; counter < (DataGridView1.Rows.Count - 1);
        counter++)
    {
        deposit = 0;
        withdrawal = 0;
        balance = int.Parse(DataGridView1.Rows[counter - 1]
            .Cells["Balance"].Value.ToString());

        if (DataGridView1.Rows[counter].Cells["Deposits"].Value != null)
        {
            // Verify that the cell value is not an empty string.
            if (DataGridView1.Rows[counter]
                .Cells["Deposits"].Value.ToString().Length != 0)
            {
                deposit = int.Parse(DataGridView1.Rows[counter]
                    .Cells["Deposits"].Value.ToString());
            }
        }

        if (DataGridView1.Rows[counter].Cells["Withdrawals"].Value != null)
        {
            if (DataGridView1.Rows[counter]
                .Cells["Withdrawals"].Value.ToString().Length != 0)
            {
                withdrawal = int.Parse(DataGridView1.Rows[counter]
                    .Cells["Withdrawals"].Value.ToString());
            }
        }
        DataGridView1.Rows[counter].Cells["Balance"].Value =
            (balance + deposit + withdrawal).ToString();
    }
}
Private Sub CellValueChanged(ByVal sender As Object, _
    ByVal e As DataGridViewCellEventArgs) _
    Handles DataGridView1.CellValueChanged

    ' Update the balance column whenever the values of any cell changes.
    UpdateBalance()
End Sub

Private Sub RowsRemoved(ByVal sender As Object, _
    ByVal e As DataGridViewRowsRemovedEventArgs) _
    Handles DataGridView1.RowsRemoved

    ' Update the balance column whenever rows are deleted.
    UpdateBalance()
End Sub

Private Sub UpdateBalance()
    Dim counter As Integer
    Dim balance As Integer
    Dim deposit As Integer
    Dim withdrawal As Integer

    ' Iterate through the rows, skipping the Starting Balance Row.
    For counter = 1 To (DataGridView1.Rows.Count - 2)
        deposit = 0
        withdrawal = 0
        balance = Integer.Parse(DataGridView1.Rows(counter - 1) _
            .Cells("Balance").Value.ToString())

        If Not DataGridView1.Rows(counter) _
            .Cells("Deposits").Value Is Nothing Then

            ' Verify that the cell value is not an empty string.
            If Not DataGridView1.Rows(counter) _
                .Cells("Deposits").Value.ToString().Length = 0 Then
                deposit = Integer.Parse(DataGridView1.Rows(counter) _
                    .Cells("Deposits").Value.ToString())
            End If
        End If

        If Not DataGridView1.Rows(counter) _
            .Cells("Withdrawals").Value Is Nothing Then
            If Not DataGridView1.Rows(counter) _
                .Cells("Withdrawals").Value.ToString().Length = 0 Then
                withdrawal = Integer.Parse(DataGridView1.Rows(counter) _
                    .Cells("Withdrawals").Value.ToString())
            End If
        End If

        DataGridView1.Rows(counter).Cells("Balance").Value = _
            (balance + deposit + withdrawal).ToString()
    Next
End Sub

Remarques

L’événement DataGridView.CellValueChanged se produit lorsque la valeur spécifiée par l’utilisateur est validée, ce qui se produit généralement lorsque le focus quitte la cellule.The DataGridView.CellValueChanged event occurs when the user-specified value is committed, which typically occurs when focus leaves the cell.

Toutefois, dans le cas de cellules de case à cocher, vous devez généralement gérer la modification immédiatement.In the case of check box cells, however, you will typically want to handle the change immediately. Pour valider la modification en cas de clic sur la cellule, vous devez gérer l’événement DataGridView.CurrentCellDirtyStateChanged.To commit the change when the cell is clicked, you must handle the DataGridView.CurrentCellDirtyStateChanged event. Dans le gestionnaire, si la cellule active est une cellule de case à cocher, appelez la méthode DataGridView.CommitEdit et transmettez la valeur Commit.In the handler, if the current cell is a check box cell, call the DataGridView.CommitEdit method and pass in the Commit value.

Les lignes du contrôle ne sont pas triées automatiquement lorsqu’une valeur de cellule est modifiée.Rows in the control are not automatically sorted when a cell value is changed. Pour trier le contrôle lorsque l’utilisateur modifie une cellule, appelez la méthode Sort dans un gestionnaire d’événements CellValueChanged.To sort the control when the user modifies a cell, call the Sort method in a CellValueChanged event handler.

Pour plus d’informations sur la façon de gérer les événements, consultez gestion et déclenchement d’événements.For more information about how to handle events, see Handling and Raising Events.

S’applique à

Voir aussi