DataGridView.RowsAdded Événement

Définition

Se produit après l'ajout d'une nouvelle ligne à DataGridView.Occurs after a new row is added to the DataGridView.

public:
 event System::Windows::Forms::DataGridViewRowsAddedEventHandler ^ RowsAdded;
public event System.Windows.Forms.DataGridViewRowsAddedEventHandler RowsAdded;
member this.RowsAdded : System.Windows.Forms.DataGridViewRowsAddedEventHandler 
Public Custom Event RowsAdded As DataGridViewRowsAddedEventHandler 

Exemples

L’exemple de code suivant gère l’événement RowsAdded pour incrémenter le nombre de lignes dans un DataGridView virtuel-1.The following code example handles the RowsAdded event to increment the number of rows in a virtual DataGridView. Le nombre de lignes est utilisé dans le gestionnaire CellValueNeeded afin qu’il sache quand afficher une cellule vide par rapport à une cellule initialisée pour une nouvelle ligne.The number of rows is used in the CellValueNeeded handler so it knows when to show a blank cell versus an initialized cell for a new row. Cet exemple fait partie d’un exemple plus complet disponible dans la rubrique de référence VirtualMode.This example is part of a larger example available in the VirtualMode reference topic.

    void VirtualConnector::dataGridView1_NewRowNeeded
        (Object^ sender, DataGridViewRowEventArgs^ e)
    {
        newRowNeeded = true;
    }

    void VirtualConnector::dataGridView1_RowsAdded
        (Object^ sender, DataGridViewRowsAddedEventArgs^ e)
    {
        if (newRowNeeded)
        {
            newRowNeeded = false;
            numberOfRows = numberOfRows + 1;
        }
    }

#pragma region Data store maintance

    void VirtualConnector::dataGridView1_CellValueNeeded
        (Object^ sender, DataGridViewCellValueEventArgs^ e)
    {
        if (store->ContainsKey(e->RowIndex))
        {
            // Use the store if the e value has been modified 
            // and stored.            
            e->Value = gcnew Int32(store->default[e->RowIndex]); 
        }
        else if (newRowNeeded && e->RowIndex == numberOfRows)
        {
            if (dataGridView1->IsCurrentCellInEditMode)
            {
                e->Value = initialValue;
            }
            else
            {
                // Show a blank e if the cursor is just loitering
                // over(the) last row.
                e->Value = String::Empty;
            }
        }
        else
        {
            e->Value = e->RowIndex;
        }
    }

    void VirtualConnector::dataGridView1_CellValuePushed
        (Object^ sender, DataGridViewCellValueEventArgs^ e)
    {
        String^ value = e->Value->ToString();
        store[e->RowIndex] = Int32::Parse(value, 
            CultureInfo::CurrentCulture);
    }
#pragma endregion
bool newRowNeeded;
private void dataGridView1_NewRowNeeded(object sender,
    DataGridViewRowEventArgs e)
{
    newRowNeeded = true;
}

const int initialSize = 5000000;
int numberOfRows = initialSize;

private void dataGridView1_RowsAdded(object sender,
     DataGridViewRowsAddedEventArgs e)
{
    if (newRowNeeded)
    {
        newRowNeeded = false;
        numberOfRows = numberOfRows + 1;
    }
}

#region "data store maintance"
const int initialValue = -1;

private void dataGridView1_CellValueNeeded(object sender,
    DataGridViewCellValueEventArgs e)
{
    if (store.ContainsKey(e.RowIndex))
    {
        // Use the store if the e value has been modified 
        // and stored.            
        e.Value = store[e.RowIndex];
    }
    else if (newRowNeeded && e.RowIndex == numberOfRows)
    {
        if (dataGridView1.IsCurrentCellInEditMode)
        {
            e.Value = initialValue;
        }
        else
        {
            // Show a blank value if the cursor is just resting
            // on the last row.
            e.Value = String.Empty;
        }
    }
    else
    {
        e.Value = e.RowIndex;
    }
}

private void dataGridView1_CellValuePushed(object sender,
    DataGridViewCellValueEventArgs e)
{
    store.Add(e.RowIndex, int.Parse(e.Value.ToString()));
}
#endregion

private Dictionary<int, int> store = new Dictionary<int, int>();
    Dim newRowNeeded As Boolean

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

        newRowNeeded = True
    End Sub

    Const initialSize As Integer = 5000000
    Dim numberOfRows As Integer = initialSize

    Private Sub dataGridView1_RowsAdded(ByVal sender As Object, _
        ByVal e As DataGridViewRowsAddedEventArgs) _
        Handles dataGridView1.RowsAdded

        If newRowNeeded Then
            newRowNeeded = False
            numberOfRows = numberOfRows + 1
        End If
    End Sub

#Region "data store maintance"
    Const initialValue As Integer = -1

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

        If store.ContainsKey(e.RowIndex) Then
            ' Use the store if the e value has been modified 
            ' and stored.
            e.Value = store(e.RowIndex)
        ElseIf newRowNeeded AndAlso e.RowIndex = numberOfRows Then
            If dataGridView1.IsCurrentCellInEditMode Then
                e.Value = initialValue
            Else
                ' Show a blank value if the cursor is just resting
                ' on the last row.
                e.Value = String.Empty
            End If
        Else
            e.Value = e.RowIndex
        End If
    End Sub

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

        store.Add(e.RowIndex, CInt(e.Value))

    End Sub
#End Region

    Dim store As System.Collections.Generic.Dictionary(Of Integer, Integer) = _
        New Dictionary(Of Integer, Integer)

Remarques

Les lignes du contrôle ne sont pas triées automatiquement lorsque de nouvelles lignes sont ajoutées.Rows in the control are not automatically sorted when new rows are added. Pour trier les nouvelles lignes à leur position correcte, appelez la méthode Sort dans un gestionnaire d’événements RowsAdded.To sort new rows into their correct position, call the Sort method in a RowsAdded event handler.

Lorsque l’utilisateur ajoute une nouvelle ligne à l’aide de la ligne pour les nouveaux enregistrements, la valeur DataGridViewRowsAddedEventArgs.RowIndex dans le gestionnaire de cet événement est égale à l’index du nouvel emplacement de la ligne pour les nouveaux enregistrements, ce qui est supérieur à la ligne qui vient d’être ajoutée.When the user adds a new row using the row for new records, the DataGridViewRowsAddedEventArgs.RowIndex value in the handler for this event is equal to the index of the new location of the row for new records, which is one greater than the row just added. Toutefois, lorsque vous ajoutez des lignes par programme, la valeur RowIndex est l’index de la première ligne ajoutée.When you add rows programmatically, however, the RowIndex value is the index of the first row added.

En mode virtuel, cet événement se produit avant l’événement CellValuePushed et peut être utilisé pour créer des enregistrements dans votre magasin de données que vous pouvez ensuite renseigner dans le gestionnaire d’événements CellValuePushed.In virtual mode, this event occurs before the CellValuePushed event and can be used to create new records in your data store that you can then populate in the CellValuePushed 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