Question

当我在列表中搜索时，我将结果传递给函数以加载DataGrid 每次触发AutoGeneratingColumn事件时，它都会再次重复相同的列。启动应用程序时，事件会检查列一次，执行第一次搜索检查两次，第二次检查三次，依此类推。我有下一个加载DataGrid的函数：

private void cargarListaAgenda(List<listaAgendaClass> lista)
{
    Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() =>
    {
        gridAgendaDataGridAgenda.AutoGeneratingColumn += (s, e) =>
        {
            e.Column.Visibility = Visibility.Hidden;

            if (e.Column.Header.ToString() == "Nombre" || e.Column.Header.ToString() == "Alias" || e.Column.Header.ToString() == "Apellidos")
            {
                e.Column.Visibility = Visibility.Visible;

                if (e.Column.Header.ToString() != "Apellidos")
                    e.Column.Width = new DataGridLength(gridAgendaDataGridAgenda.Width * 0.33);

                else
                    e.Column.Width = new DataGridLength(1, DataGridLengthUnitType.Star);
            }
        };

        gridAgendaDataGridAgenda.ItemsSource = null;
        gridAgendaDataGridAgenda.ItemsSource = lista;
    }));
}

Answer 1

每次调用cargarListaAgenda方法时，似乎都附加了一个新的事件处理程序。

尝试在添加新事件之前删除事件处理程序：

private void cargarListaAgenda(List<listaAgendaClass> lista)
{
    Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() =>
    {
        gridAgendaDataGridAgenda.AutoGeneratingColumn -= GridAgendaDataGridAgenda_AutoGeneratingColumn;
        gridAgendaDataGridAgenda.AutoGeneratingColumn += GridAgendaDataGridAgenda_AutoGeneratingColumn;

        gridAgendaDataGridAgenda.ItemsSource = lista;
    }));
}

private void GridAgendaDataGridAgenda_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    e.Column.Visibility = Visibility.Hidden;

    if (e.Column.Header.ToString() == "Nombre" || e.Column.Header.ToString() == "Alias" || e.Column.Header.ToString() == "Apellidos")
    {
        e.Column.Visibility = Visibility.Visible;

        if (e.Column.Header.ToString() != "Apellidos")
            e.Column.Width = new DataGridLength(gridAgendaDataGridAgenda.Width * 0.33);

        else
            e.Column.Width = new DataGridLength(1, DataGridLengthUnitType.Star);
    }
}

为什么DataGrid中的AutoGeneratingColumn事件会重复列？

1 个答案: