Question

我有一个非常基本的DataGrid包含一些测试数据。数据以ObservableCollection<T> Client的{{1}}提供，其中包含objects，Organization和FirstName属性。我按LastName对项目进行分组，并希望能够按特定群组中的Organization和FirstName进行排序（此部分正常运行），并按{{1}对群组进行排序}。最后一部分是我遇到问题的部分。

如果我没有指定任何排序属性，或者我在LastName中指定了一个属性（见下文），例如Organization或CollectionViewSource.SortDescriptions，{{1除外它会让我做一个初步的排序。如果您查看下面的图像，公司名称将不按顺序显示，因为这是集合的初始化方式。如果我点击PropertyName="Name"标题，它会按升序对其进行排序，但不会让我在此之后再进行排序。如果我再次单击标题，它将更改箭头，这表示排序方向，但不会发生实际排序。无论我指定什么排序属性，这都是相同的...即使是完全任意的属性，除非它PropertyName="CompleteNonsense"，或者没有指定属性。

如果我在PropertyName="Organization"上指定排序，它将按升序开始排序，但如果单击标题则不会排序。因此，似乎该属性名称确实触发排序，但仅限于第一次。

截图：

这里是Organization的{{1}}：

PropertyName="Organization"

这里是PropertyName="Organization"和XAML的{{1}}：

DataGrid

有没有人知道如何在<DataGrid ItemsSource="{Binding Source={StaticResource GroupedData}}" AutoGenerateColumns="False" IsReadOnly="True" GridLinesVisibility="None" HeadersVisibility="Column" CanUserAddRows="False" CanUserDeleteRows="False" CanUserResizeRows="False" Background="White"> <DataGrid.CellStyle> <Style TargetType="DataGridCell"> <Setter Property="BorderThickness" Value="0"/> </Style> </DataGrid.CellStyle> <DataGrid.RowStyle> <Style TargetType="DataGridRow"> <Setter Property="Margin" Value="10,0,0,0"/> </Style> </DataGrid.RowStyle> <DataGrid.GroupStyle> <GroupStyle> <GroupStyle.HeaderTemplate> <DataTemplate> <DockPanel Background="LightBlue" DataContext="{Binding Items}"> <TextBlock Text="{Binding Path=Organization}" Foreground="Blue" Margin="5,0,0,0" Width="100"/> <TextBlock Text="Employee Count:" Foreground="Blue" Margin="40,0,0,0"/> <TextBlock Text="{Binding Path=Count}" Foreground="Blue" Margin="5,0,0,0"/> </DockPanel> </DataTemplate> </GroupStyle.HeaderTemplate> </GroupStyle> </DataGrid.GroupStyle> <DataGrid.Columns> <DataGridTextColumn Header="Organization" Binding="{Binding Organization}"/> <DataGridTextColumn Header="First Name" Binding="{Binding FirstName}"/> <DataGridTextColumn Header="Last Name" Binding="{Binding LastName}"/> <DataGridTextColumn Width="*"/> </DataGrid.Columns> </DataGrid>超出初始排序后对组进行排序？

修改

我一直在搞乱这个问题（真的需要弄明白这一点）并为标题创建了一个快速的代码隐藏事件处理程序。 XAML事件：

Grouping

Sorting

每次点击<CollectionViewSource Source="{Binding Data}" x:Key="GroupedData"> <CollectionViewSource.GroupDescriptions> <PropertyGroupDescription PropertyName="Organization"/> </CollectionViewSource.GroupDescriptions> <CollectionViewSource.SortDescriptions> <scm:SortDescription PropertyName="Organization"/> </CollectionViewSource.SortDescriptions> </CollectionViewSource>后，弹出Organization，向下排序箭头点，点击Click后，它会立即恢复向上指向。组的实际排序永远不会在视觉上发生。有些东西让它卡在<DataGrid.ColumnHeaderStyle> <Style TargetType="DataGridColumnHeader"> <EventSetter Event="Click" Handler="ColumnHeader_Click"/> </Style> </DataGrid.ColumnHeaderStyle>订单中。

Answer 1

注意：有关最新代码，请参阅修改。

这有点棘手，但我能够找到答案。下面的代码适用于Sorting事件的代码隐藏处理程序，但可以轻松调整以放置在ViewModel或View中（取决于您的操作方式）。< / p>

<强>代码：

<DataGrid Sorting="DataGrid_Sorting" ... > ... </DataGrid>

private void DataGrid_Sorting(object sender, DataGridSortingEventArgs e)
{
    var headerName = "Organization";

    var column = e.Column;
    if (!column.Header.ToString().Equals(headerName))
    {
        return;
    }

    var source = (sender as System.Windows.Controls.DataGrid).ItemsSource as ListCollectionView;
    if (source == null)
    {
        return;
    }

    e.Handled = true;
    var sortDirection = column.SortDirection == ListSortDirection.Ascending ? 
        ListSortDirection.Descending : ListSortDirection.Ascending;

    using (source.DeferRefresh())
    {
        source.SortDescriptions.Clear();
        source.SortDescriptions.Add(new SortDescription(headerName, sortDirection));
    }
    source.Refresh();
    column.SortDirection = sortDirection;
}

使用上面的代码，群组本身按Organization排序，每个群组中的项目按FirstName和LastName排序。希望这段代码可以帮助别人。我一整天都在搜索，这似乎是人们在DataGrid处理群组时遇到的常见问题。

唯一的缺点是当组项目按分组属性以外的任何其他方式排序时，它会将组的顺序重置为默认值。在尝试了很多代码后，我无法找到解决方案。如果有人找到该部分的解决方案，我很乐意给他们“正确答案”。

帮助我的一些资源：

How to force DataGrid group order in WPF?
WPF Datagrid group and sort

修改

找出关于通过组内排序重置的组间排序的最后部分。这有点乱，因为我没有时间来清理它，但我想我会分享我的代码：

<CollectionViewSource.GroupDescriptions> <PropertyGroupDescription PropertyName="Organization"/> </CollectionViewSource.GroupDescriptions> <CollectionViewSource.SortDescriptions> <scm:SortDescription PropertyName="Organization" Direction="Ascending"/> <scm:SortDescription PropertyName="FirstName" Direction="Ascending"/> <scm:SortDescription PropertyName="LastName" Direction="Ascending"/> </CollectionViewSource.SortDescriptions>

private void DataGrid_Sorting(object sender, DataGridSortingEventArgs e) { SortGroupedDataGrid("Organization", sender, e); } private void SortGroupedDataGrid(string groupHeader, object sender, DataGridSortingEventArgs e) { // Get the main ListCollectionView and make sure it's not null. var source = (sender as System.Windows.Controls.DataGrid).ItemsSource as ListCollectionView; if (source == null) { return; } // Mark event as handled, so that automated sorting would not take place. e.Handled = true; // Main header which was used for the grouping. I'm only using one, but more can be added. var headerName = groupHeader; // Get the column that was being sorted on. var column = e.Column; // Check if the column was the same as the one being used for the grouping. // I remove spaces so that any properties I use match the headers. Regex would probably // work just as well, but it's an overkill for me at this time. var isMainHeader = column.Header.ToString().Replace(" ", "").Equals(headerName); // Because I set the initial sorting for all the properties in the XAML to be // be sorted in Ascending order, I set these ones to Descending. One is for // the main column and the other is for the secondary column. This does not account // for a case where user Shift + Clicks multiple columns to chain sort. var mainSortDirection = ListSortDirection.Descending; var secondarySortDirection = ListSortDirection.Descending; // If this is a main column sort event... if (isMainHeader) { // Check its sorting direction and set it as opposite. mainSortDirection = column.SortDirection == ListSortDirection.Descending ? ListSortDirection.Ascending : mainSortDirection; } else { // ...else, get the sorting direction of the main column, because we want // it to stay the same, and get the opposite sorting direction for the // secondary column. mainSortDirection = source.SortDescriptions[0].Direction; secondarySortDirection = column.SortDirection == ListSortDirection.Descending ? ListSortDirection.Ascending : secondarySortDirection; } // Defer refreshing of the DataGrid. using (source.DeferRefresh()) { // Clear any existing sorts. I've had some issues trying to alter existing ones. source.SortDescriptions.Clear(); // Since we want main column to either alter if its sort event was called, or // stay the same if secondary column event was called, we always set it first. source.SortDescriptions.Add(new SortDescription(headerName, mainSortDirection)); // If this was not a main column event... if (!isMainHeader) { // ...then set sorting for that other column. Since it'll be at index 1, // after the main one, it'll only sort within each group, as I wanted. source.SortDescriptions.Add(new SortDescription(column.Header.ToString().Replace(" ", ""), secondarySortDirection)); // Set the header direction as well. column.SortDirection = secondarySortDirection; } else { // Otherwise, it's a main event and we want to show the error for its header. // If you want primary sorting direction to always display, then simply take // it outside of else scope, so that it's always assigned. column.SortDirection = mainSortDirection; } } // Now we can refresh and post changes. source.Refresh(); }

对DataGrid组进行排序

1 个答案: