DataGridView.CellValueChanged DataGridView.CellValueChanged DataGridView.CellValueChanged DataGridView.CellValueChanged Event

Definición

Tiene lugar cuando el valor de una celda cambia.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 

Ejemplos

En el ejemplo de código siguiente se muestra cómo usar el CellValueChanged eventos para actualizar los valores de una columna de saldo de una DataGridView.The following code example demonstrates how to use the CellValueChanged event to update the values in a balance column of a DataGridView. Este ejemplo forma parte de un ejemplo más extenso proporcionado en el SelectionChanged eventos.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

Comentarios

El DataGridView.CellValueChanged evento tiene lugar cuando se confirma, el valor especificado por el usuario que normalmente se produce cuando el foco sale de la celda.The DataGridView.CellValueChanged event occurs when the user-specified value is committed, which typically occurs when focus leaves the cell.

En el caso de las celdas de casilla de verificación, sin embargo, normalmente deseará controlar el cambio inmediatamente.In the case of check box cells, however, you will typically want to handle the change immediately. Para confirmar el cambio cuando se hace clic en la celda, se debe controlar la DataGridView.CurrentCellDirtyStateChanged eventos.To commit the change when the cell is clicked, you must handle the DataGridView.CurrentCellDirtyStateChanged event. En el controlador, si la celda actual es una celda de la casilla de verificación, llame a la DataGridView.CommitEdit método y pase la Commit valor.In the handler, if the current cell is a check box cell, call the DataGridView.CommitEdit method and pass in the Commit value.

Las filas en el control no se ordenan automáticamente cuando se cambia un valor de celda.Rows in the control are not automatically sorted when a cell value is changed. Para ordenar el control cuando el usuario modifica una celda, llame a la Sort método en un CellValueChanged controlador de eventos.To sort the control when the user modifies a cell, call the Sort method in a CellValueChanged event handler.

Para obtener más información acerca de cómo controlar eventos, vea controlar y provocar eventos.For more information about how to handle events, see Handling and Raising Events.

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