WPF DataGrid Group Column Virtualization Exception

昌康卢 0

When using the GridGrid in WPF, after customizing the grouping style of the DataGrid.GroupStyle, enabling column virtualization can cause abnormal display of the GridGrid. Is there a solution to enable EnableColumnVirtualization=true when customizing the DataGrid.GroupStyle

Hongrui Yu-MSFT 3,645 Microsoft 供应商

你好，@昌康卢。欢迎来到 Microsoft 问答。

在我的测试中，并没有遇到你所描述的异常

MainWindow.xaml

    <Grid>
        <DataGrid x:Name="MyDataGrid"  AutoGenerateColumns="False" CanUserAddRows="False" EnableColumnVirtualization="True">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Id" Binding="{Binding Id}"></DataGridTextColumn>
                <DataGridTextColumn Header="Name" Binding="{Binding Name}"></DataGridTextColumn>
                <DataGridTextColumn Header="Area" Binding="{Binding Area}"></DataGridTextColumn>
                <DataGridTextColumn Header="Population" Binding="{Binding Population}"></DataGridTextColumn>
            </DataGrid.Columns>
            <DataGrid.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="GroupItem">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="GroupItem">
                                        <Expander IsExpanded="True">
                                            <Expander.Header>
                                                <StackPanel Orientation="Horizontal">
                                                    <TextBlock Text="{Binding Name}" FontWeight="Bold"/>
                                                    <TextBlock Text="{Binding ItemCount, StringFormat= ({0} items)}"/>
                                                </StackPanel>
                                            </Expander.Header>
                                            <ItemsPresenter/>
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </DataGrid.GroupStyle>
        </DataGrid>
    </Grid>

MainWindow.xaml.cs

    public partial class MainWindow : Window
    {
        public MainWindowViewModel viewModel = new MainWindowViewModel();
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = viewModel;
            var collectionView = new ListCollectionView(viewModel.cities);
            collectionView.GroupDescriptions.Add(new PropertyGroupDescription("Area"));
            MyDataGrid.ItemsSource = collectionView;
        }
    }

City.cs

    public class City
    {
        public int Id { get; set; }
        public string Name { get; set; }

        public string Area { get; set; }

        public int Population { get; set; }
    }

MainWindowViewModel.cs

    public class MainWindowViewModel
    {
        public ObservableCollection<City> cities = new ObservableCollection<City>() { 
            new City() { Id = 1,Name="A_A",Area="A",Population=5 },
            new City() { Id = 2,Name="B_A",Area="B",Population=2 },
            new City() { Id = 3,Name="C_A",Area="C",Population=1 },
            new City() { Id = 4,Name="B_B",Area="B",Population=4 },
            new City() { Id = 5,Name="C_B",Area="C",Population=7 },
            new City() { Id = 6,Name="A_B",Area="A",Population=6 },
            new City() { Id = 7,Name="A_C",Area="A",Population=8 },
            new City() { Id = 8,Name="D_A",Area="D",Population=3 },
        };
    }

运行结果：你能提供最小可重现问题的代码吗，以及请详细地描述你所遇到的异常情况。

通过

WPF DataGrid Group Column Virtualization Exception

你的答案