Question

我有一个包含3列的WPF DataGrid。对于前两列，我想要默认排序，但对于第三列，我想要按升序/降序排序。我已经在datagrid上处理了排序事件，如下所示：

        private void ReleaseDataGrid_Sorting(object sender, DataGridSortingEventArgs e)
    {
        ListSortDirection direction = (e.Column.SortDirection != ListSortDirection.Ascending) ? ListSortDirection.Ascending : ListSortDirection.Descending;
        if (e.Column.SortMemberPath == "DisplayName")
        {
            SortStatusImg.Visibility = System.Windows.Visibility.Collapsed;
            SortVersionImg.Visibility = System.Windows.Visibility.Collapsed;
            SortPackageNameImg.Visibility = System.Windows.Visibility.Visible;
            if (direction == ListSortDirection.Ascending)
            {
                SortPackageNameImg.Source = new BitmapImage(new Uri(@"pack://application:,,,/Resources/sortup.png"));
            }
            else
            {
                SortPackageNameImg.Source = new BitmapImage(new Uri(@"pack://application:,,,/Resources/sortdown.png"));
            }
        }
        else if (e.Column.SortMemberPath == "UserMachineStatus")
        {
            SortStatusImg.Visibility = System.Windows.Visibility.Visible;
            SortVersionImg.Visibility = System.Windows.Visibility.Collapsed;
            SortPackageNameImg.Visibility = System.Windows.Visibility.Collapsed;
            if (direction == ListSortDirection.Ascending)
            {
                SortStatusImg.Source = new BitmapImage(new Uri(@"pack://application:,,,/Resources/sortup.png"));
            }
            else
            {
                SortStatusImg.Source = new BitmapImage(new Uri(@"pack://application:,,,/Resources/sortdown.png"));
            }
        }
        else if (e.Column.SortMemberPath == "ReleaseInfo")
        {

            DisplayReleaseList.Sort(new VersionComparerDesc());

            SortStatusImg.Visibility = System.Windows.Visibility.Collapsed;
            SortVersionImg.Visibility = System.Windows.Visibility.Visible;
            SortPackageNameImg.Visibility = System.Windows.Visibility.Collapsed;
            if (direction == ListSortDirection.Ascending)
            {
                SortVersionImg.Source = new BitmapImage(new Uri(@"pack://application:,,,/Resources/sortup.png"));
                DisplayReleaseList.Sort(new VersionComparer());
            }
            else
            {
                SortVersionImg.Source = new BitmapImage(new Uri(@"pack://application:,,,/Resources/sortdown.png"));
                DisplayReleaseList.Sort(new VersionComparerDesc());
            }

            RefreshMediaGrid();
            e.Handled = true;
        }
    }

对于前两列，它工作正常。但是对于自定义排序列，它按升序排序一次，后来无论我点击列标题多少次都没有排序。

当我按第三列排序时，ListSortDirection始终为null，因此当控件进入此方法时，始终为方向分配ListSortDirection.Ascending

它不保留排序方向。请帮忙。

Answer 1

您应该设置列的SortDirection属性：

private void ReleaseDataGrid_Sorting(object sender, DataGridSortingEventArgs e)
{
    if (e.Column.SortMemberPath == "ReleaseInfo")
    {
        e.Handled = true;
        ListSortDirection direction = (e.Column.SortDirection != ListSortDirection.Ascending) ? ListSortDirection.Ascending : ListSortDirection.Descending;
        e.Column.SortDirection = direction;

        //sort according to your logic...
    }
}

这会使箭头在列标题中按预期显示。

对于wpf datagrid中的自定义排序列，列表排序方向始终为空

1 个答案: