DataGridView.ColumnHeaderMouseClick Evento

Definição

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Ocorre quando o usuário clica no cabeçalho de uma coluna.

public:
 event System::Windows::Forms::DataGridViewCellMouseEventHandler ^ ColumnHeaderMouseClick;

public event System.Windows.Forms.DataGridViewCellMouseEventHandler ColumnHeaderMouseClick;

member this.ColumnHeaderMouseClick : System.Windows.Forms.DataGridViewCellMouseEventHandler 

Public Custom Event ColumnHeaderMouseClick As DataGridViewCellMouseEventHandler 

Tipo de evento

DataGridViewCellMouseEventHandler

Exemplos

Quando um título de coluna é clicado em um DataGridView, o comportamento padrão é ordenar as linhas de grade com base na coluna clicada ou reverter a ordem de classificação se a grade já estiver classificada pela coluna clicada. O exemplo de código a seguir demonstra como usar esse evento para executar uma classificação programática que emula o comportamento padrão de clicar em um DataGridViewColumnHeaderCell quando o comportamento padrão tiver sido desabilitado. Neste exemplo, o SelectionMode é definido ColumnHeaderSelectcomo , portanto, clicar no DataGridViewColumnHeaderCell seleciona o conteúdo da coluna. Para que o código de exemplo funcione conforme o esperado, o comportamento de clique do cabeçalho de coluna padrão precisa ser alterado sempre que os dados são carregados no DataGridView. Adicione um DataBindingComplete manipulador de eventos para fornecer o código que altera o comportamento padrão. Para executar este exemplo, cole o código em um formulário que contenha um DataGridView nomeado dataGridView1 e verifique se todos os eventos estão associados aos manipuladores de eventos.

private void dataGridView1_ColumnHeaderMouseClick(
    object sender, DataGridViewCellMouseEventArgs e)
{
    DataGridViewColumn newColumn = dataGridView1.Columns[e.ColumnIndex];
    DataGridViewColumn oldColumn = dataGridView1.SortedColumn;
    ListSortDirection direction;

    // If oldColumn is null, then the DataGridView is not sorted.
    if (oldColumn != null)
    {
        // Sort the same column again, reversing the SortOrder.
        if (oldColumn == newColumn &&
            dataGridView1.SortOrder == SortOrder.Ascending)
        {
            direction = ListSortDirection.Descending;
        }
        else
        {
            // Sort a new column and remove the old SortGlyph.
            direction = ListSortDirection.Ascending;
            oldColumn.HeaderCell.SortGlyphDirection = SortOrder.None;
        }
    }
    else
    {
        direction = ListSortDirection.Ascending;
    }

    // Sort the selected column.
    dataGridView1.Sort(newColumn, direction);
    newColumn.HeaderCell.SortGlyphDirection =
        direction == ListSortDirection.Ascending ?
        SortOrder.Ascending : SortOrder.Descending;
}

private void dataGridView1_DataBindingComplete(object sender,
    DataGridViewBindingCompleteEventArgs e)
{
    // Put each of the columns into programmatic sort mode.
    foreach (DataGridViewColumn column in dataGridView1.Columns)
    {
        column.SortMode = DataGridViewColumnSortMode.Programmatic;
    }
}

Private Sub dataGridView1_ColumnHeaderMouseClick(ByVal sender As Object, _
    ByVal e As DataGridViewCellMouseEventArgs) _
    Handles dataGridView1.ColumnHeaderMouseClick

    Dim newColumn As DataGridViewColumn = _
        dataGridView1.Columns(e.ColumnIndex)
    Dim oldColumn As DataGridViewColumn = dataGridView1.SortedColumn
    Dim direction As ListSortDirection

    ' If oldColumn is null, then the DataGridView is not currently sorted.
    If oldColumn IsNot Nothing Then

        ' Sort the same column again, reversing the SortOrder.
        If oldColumn Is newColumn AndAlso dataGridView1.SortOrder = _
            SortOrder.Ascending Then
            direction = ListSortDirection.Descending
        Else

            ' Sort a new column and remove the old SortGlyph.
            direction = ListSortDirection.Ascending
            oldColumn.HeaderCell.SortGlyphDirection = SortOrder.None
        End If
    Else
        direction = ListSortDirection.Ascending
    End If

    ' Sort the selected column.
    dataGridView1.Sort(newColumn, direction)
    If direction = ListSortDirection.Ascending Then
        newColumn.HeaderCell.SortGlyphDirection = SortOrder.Ascending
    Else
        newColumn.HeaderCell.SortGlyphDirection = SortOrder.Descending
    End If

End Sub

Private Sub dataGridView1_DataBindingComplete(ByVal sender As Object, _
    ByVal e As DataGridViewBindingCompleteEventArgs) _
    Handles dataGridView1.DataBindingComplete

    ' Put each of the columns into programmatic sort mode.
    For Each column As DataGridViewColumn In dataGridView1.Columns
        column.SortMode = DataGridViewColumnSortMode.Programmatic
    Next
End Sub

Comentários

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

Confira também

• Controle DataGridView (Windows Forms)