DataGridView.CellValueChanged Evento

Definición

Espacio de nombres:

System.Windows.Forms

Ensamblado:

System.Windows.Forms.dll

Tiene lugar cuando el valor de una celda cambia.

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 

Tipo de evento

DataGridViewCellEventHandler

Ejemplos

En el ejemplo de código siguiente se muestra cómo usar el CellValueChanged evento para actualizar los valores de una columna de equilibrio de .DataGridView Este ejemplo forma parte de un ejemplo más grande disponible en el SelectionChanged evento .

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

Comentarios

El DataGridView.CellValueChanged evento se produce cuando se confirma el valor especificado por el usuario, que normalmente se produce cuando el foco sale de la celda.

Sin embargo, en el caso de las celdas de casilla, normalmente querrá controlar el cambio inmediatamente. Para confirmar el cambio cuando se hace clic en la celda, tiene que controlar el evento DataGridView.CurrentCellDirtyStateChanged. En el controlador, si la celda actual es una celda de casilla, llame al método DataGridView.CommitEdit y pase el valor Commit.

Las filas del control no se ordenan automáticamente cuando se cambia un valor de celda. Para ordenar el control cuando el usuario modifica una celda, llame al Sort método en un CellValueChanged controlador de eventos.

Para obtener más información acerca de cómo controlar eventos, vea controlar y provocar eventos.

Consulte también

• DataGridView (Control, formularios Windows Forms)