WPF GridView 单击列标题时排序

Question

我正在实现一个 GridView，它通过单击列标题进行排序。我正在寻找标准解决方案之一，但它对我不起作用。

我有一个标题“P”，而单元格的内容和标题都应居中（对齐）。标题的标签“P”与绑定的“照片”不同。

<GridViewColumn Width="30" Header="P">

    <GridViewColumn.HeaderContainerStyle>
        <Style TargetType="{x:Type GridViewColumnHeader}">
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
        </Style>
    </GridViewColumn.HeaderContainerStyle>

        <GridViewColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Photo}" HorizontalAlignment="Center"/>
        </DataTemplate>
    </GridViewColumn.CellTemplate>

</GridViewColumn>

处理列单击的代码如下（来自 Mircosoft 站点）。

假设有一个 DisplayMemberBinding

var columnBinding = headerClicked.Column.DisplayMemberBinding as Binding;

我没有，否则列标题和内容不居中。

否则它将以列的标签作为属性进行排序。

var sortBy = columnBinding?.Path.Path ?? headerClicked.Column.Header as string;

这也不起作用，因为我的标签是“P”，属性是“Photo”。

还有其他想法吗？

internal void HandleOverviewColumnHeaderClicked(GridViewColumnHeader headerClicked)
{
    ListSortDirection direction;

    if (headerClicked != null)
    {
        if (headerClicked.Role != GridViewColumnHeaderRole.Padding)
        {
            if (headerClicked != _lastHeaderClicked)
            {
                direction = ListSortDirection.Ascending;
            }
            else
            {
                if (_lastDirection == ListSortDirection.Ascending)
                {
                    direction = ListSortDirection.Descending;
                }
                else
                {
                    direction = ListSortDirection.Ascending;
                }
            }

            var columnBinding = headerClicked.Column.DisplayMemberBinding as Binding;
            var sortBy = columnBinding?.Path.Path ?? headerClicked.Column.Header as string;

            Sort(sortBy, direction);

            if (direction == ListSortDirection.Ascending)
            {
                headerClicked.Column.HeaderTemplate = _window.Resources["HeaderTemplateArrowUp"] as DataTemplate;
            }
            else
            {
                headerClicked.Column.HeaderTemplate = _window.Resources["HeaderTemplateArrowDown"] as DataTemplate;
            }

            // Remove arrow from previously sorted header
            if (_lastHeaderClicked != null && _lastHeaderClicked != headerClicked)
            {
                _lastHeaderClicked.Column.HeaderTemplate = null;
            }

            _lastHeaderClicked = headerClicked;
            _lastDirection = direction; 
        }
    }
}

Answer 1

<GridViewColumn DisplayMemberBinding="{Binding MyData}">
      <GridViewColumnHeader Content="MyHeader" Click="GridViewColumnHeader_Click" />
</GridViewColumn>

和

        GridViewColumnHeader _lastHeaderClicked = null;
        ListSortDirection _lastDirection = ListSortDirection.Ascending;

        private void GridViewColumnHeader_Click(object sender, RoutedEventArgs e)
        {            
            var headerClicked = e.OriginalSource as GridViewColumnHeader;
            ListSortDirection direction;

            if (headerClicked != null)
            {
                if (headerClicked.Role != GridViewColumnHeaderRole.Padding)
                {
                    if (headerClicked != _lastHeaderClicked)
                    {
                        direction = ListSortDirection.Ascending;
                    }
                    else
                    {
                        if (_lastDirection == ListSortDirection.Ascending)
                        {
                            direction = ListSortDirection.Descending;
                        }
                        else
                        {
                            direction = ListSortDirection.Ascending;
                        }
                    }

                    var columnBinding = headerClicked.Column.DisplayMemberBinding as Binding;
                    var sortBy = columnBinding?.Path.Path ?? headerClicked.Column.Header as string;

                    Sort(sortBy, direction);

                    if (direction == ListSortDirection.Ascending)
                    {
                        headerClicked.Column.HeaderTemplate =
                          Resources["HeaderTemplateArrowUp"] as DataTemplate;
                    }
                    else
                    {
                        headerClicked.Column.HeaderTemplate =
                          Resources["HeaderTemplateArrowDown"] as DataTemplate;
                    }

                    // Remove arrow from previously sorted header
                    if (_lastHeaderClicked != null && _lastHeaderClicked != headerClicked)
                    {
                        _lastHeaderClicked.Column.HeaderTemplate = null;
                    }

                    _lastHeaderClicked = headerClicked;
                    _lastDirection = direction;
                }
            }
        }

        private void Sort(string sortBy, ListSortDirection direction)
        {
            ICollectionView dataView =
              CollectionViewSource.GetDefaultView(lv.ItemsSource);

            dataView.SortDescriptions.Clear();
            SortDescription sd = new SortDescription(sortBy, direction);
            dataView.SortDescriptions.Add(sd);
            dataView.Refresh();
        }

Answer 2

您可以使用 Tag 属性来设置排序依据的数据成员，因为 DisplayMemberBinding 和 Header 不包含您需要的名称。然后获取标签，类似于示例代码访问 DisplayMemberBinding 的方式。