DataGridView.ColumnHeaderMouseClick Evento

Definição

Ocorre quando o usuário clica no cabeçalho de uma coluna.Occurs when the user clicks a column header.

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 

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 para inverter a ordem de classificação se a grade já estiver classificada pela coluna clicada.When a column heading is clicked in a DataGridView, the default behavior is to order the grid rows based on the clicked column, or to reverse the sort order if the grid is already sorted by the clicked column. 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 foi desabilitado.The following code example demonstrates how to use this event to perform a programmatic sort that emulates the default behavior of clicking a DataGridViewColumnHeaderCell when the default behavior has been disabled. Neste exemplo, o SelectionMode é definido como ColumnHeaderSelect, então clicar no DataGridViewColumnHeaderCell seleciona o conteúdo da coluna.In this example, the SelectionMode is set to ColumnHeaderSelect, so clicking the DataGridViewColumnHeaderCell selects the contents of the column. Para que o código de exemplo funcione conforme o esperado, o comportamento de clique do cabeçalho de coluna padrão precisa ser alterado cada vez que os dados são carregados no DataGridView.For the example code to function as intended, the default column header click behavior needs to be changed each time the data is loaded into the DataGridView. Adicione um manipulador de eventos DataBindingComplete para fornecer o código que altera o comportamento padrão.Add a DataBindingComplete event handler to provide the code that changes the default behavior. Para executar este exemplo, Cole o código em um formulário que contenha um DataGridView chamado dataGridView1 e verifique se todos os eventos estão associados aos seus manipuladores de eventos.To run this example, paste the code into a form that contains a DataGridView named dataGridView1 and ensure that all events are associated with their event handlers.

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.For more information about how to handle events, see Handling and Raising Events.

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