DataGridView.CellValuePushed Evento

Definição

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Ocorre quando a propriedade VirtualMode do controle DataGridView é true e um valor de célula foi alterado e requer armazenamento na fonte de dados subjacente.

public:
 event System::Windows::Forms::DataGridViewCellValueEventHandler ^ CellValuePushed;

public event System.Windows.Forms.DataGridViewCellValueEventHandler CellValuePushed;

member this.CellValuePushed : System.Windows.Forms.DataGridViewCellValueEventHandler 

Public Custom Event CellValuePushed As DataGridViewCellValueEventHandler 

Tipo de evento

DataGridViewCellValueEventHandler

Exemplos

O exemplo de código a seguir manipula o CellValuePushed evento para armazenar atualizações e novas entradas em um objeto de armazenamento de dados. Este exemplo faz parte de um exemplo maior disponível no VirtualMode tópico de referência.

#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

#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>();

#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)

Comentários

Use esse evento no modo virtual para atualizar um armazenamento de dados personalizado com dados especificados pelo usuário. Manipule o CellValueNeeded evento para recuperar valores do armazenamento de dados para exibição no controle .

Para obter mais informações sobre o modo virtual, consulte Como implementar o modo virtual no controle DataGridView dos Windows Forms.

Para obter mais informações sobre como lidar com eventos, consulte Manipulando e gerando eventos.

Confira também

• VirtualMode
• DataGridViewCellValueEventHandler
• DataGridViewCellValueEventArgs
• CellValueNeeded
• OnCellValuePushed(DataGridViewCellValueEventArgs)
• Modo virtual no controle DataGridView dos Windows Forms
• Controle DataGridView (Windows Forms)