RowVirtualization导致行的背景颜色不正确

Question

我有一个WPF应用程序,在某些页面中有一个Datagrid.这个数据网格需要一次加载5000行(分页对我来说不是一个选项),这需要很长时间.我设置EnableRowVirtualization = True并且现在可以接受性能,但这里存在问题.在我的数据网格中,我需要根据列值(比如STATUS)将不同的背景颜色设置为不同的行,将EnableRowVirtualization从False更改为True,在滚动时导致错误的着色.

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这是我的XAML代码:

<my:DataGrid Name="dgDataGrid" DockPanel.Dock="Top" AutoGenerateColumns="False"  ClipboardCopyMode="ExcludeHeader" 
                     CanUserDeleteRows="True" RowHeight="20" SelectionMode="Extended"  SelectionUnit="FullRow" FontFamily="Tahoma" 
                     ItemsSource="{Binding}"  VirtualizingStackPanel.VirtualizationMode="Recycling" VirtualizingStackPanel.IsVirtualizing="True" 
                     EnableRowVirtualization="True" EnableColumnVirtualization="False" IsSynchronizedWithCurrentItem="True" BorderBrush="Blue"  
                     RowBackground="White" HorizontalGridLinesBrush="Blue"  GridLinesVisibility="Horizontal" VerticalGridLinesBrush="Blue"  
                     IsTextSearchEnabled="False" IsTabStop="True" HeadersVisibility="All" Loaded="dgDataGrid_Loaded"  
                     ContextMenuOpening="dgDataGrid_ContextMenuOpening" LoadingRow="dgDataGrid_LoadingRow" 
                     ScrollViewer.IsDeferredScrollingEnabled ="True">
            <my:DataGrid.Resources>

            </my:DataGrid.Resources>

            <my:DataGrid.RowHeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type my:DataGridRow}}, Path=Header}"></TextBlock>
                </DataTemplate>
            </my:DataGrid.RowHeaderTemplate>
            <my:DataGrid.ColumnHeaderStyle>
                <Style TargetType="my:DataGridColumnHeader">
                    <Setter Property="ContentTemplate">
                        <Setter.Value>
                            <DataTemplate>
                                <TextBlock Text="{Binding}" Foreground="Blue"/>
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </my:DataGrid.ColumnHeaderStyle>

            <my:DataGrid.ContextMenu>
                <ContextMenu Name="cmDataGrid" StaysOpen="True">
                    <MenuItem Name="mnuView" Header="?????">
                        <MenuItem Name="mnuHideColumn"  Header="Hide Column" Click="mnuHideColumn_Click"/>
                        <MenuItem Name="mnuShowColumn" Header="Show Column"/>
                        <Separator/>
                        <MenuItem Name="mnuGroupByColumn" 
                          Header="Group by this column" Click="mnuGroupColumn_Click" />
                        <MenuItem Name="mnuClearGroups" 
                          Header="Clear grouping" Click="mnuGroupColumn_Click" />
                        <Separator/>
                        <MenuItem Header="Header Alignment">
                            <MenuItem Name="mnuHeaderCenter" Header="Center"/>
                            <MenuItem Name="mnuHeaderLeft" Header="Left"/>
                            <MenuItem Name="mnuHeaderRight" Header="Right"/>
                        </MenuItem>
                        <MenuItem Header="Content Alignment">
                            <MenuItem Name="mnuContentCenter" Header="Center"/>
                            <MenuItem Name="mnuContentLeft" Header="Left"/>
                            <MenuItem Name="mnuContentRight" Header="Right"/>
                        </MenuItem>
                    </MenuItem>
                </ContextMenu>
            </my:DataGrid.ContextMenu>
        </my:DataGrid>

以下代码执行绑定:

注意:我的所有列都是动态生成的,具体取决于请求加载的对象:

public static DataGridColumn CreateTextBoxWithBackgroudColumn(DataColumn dataCol, string columnName)
        {
            DataGridTemplateColumn dgtc = new DataGridTemplateColumn();
            dgtc.Header = columnName;
            dgtc.HeaderStyle = (Style)(App.Current as App).FindResource("ColumnHeaderStyle");

            FrameworkElementFactory cellTemplateFactory = new FrameworkElementFactory(typeof(TextBlock));
            Binding dataBinding = new Binding(dataCol.ColumnName);
            dataBinding.Mode = BindingMode.TwoWay;
            dataBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;

            dataBinding.Converter = new BackGroundConverter();

            cellTemplateFactory.SetBinding(TextBlock.BackgroundProperty, dataBinding);
            DataTemplate cellTemplate = new DataTemplate();
            cellTemplate.VisualTree = cellTemplateFactory;
            cellTemplate.Seal();
            dgtc.CellTemplate = cellTemplate;

            return dgtc;
        }

返回的DataGridColumn将添加到我的DataGrid列.

是否可以同时使用RowVirtualization和着色？

谢谢.

Answer 1

这对你来说可能有点太晚,因为你显然找到了适合你的解决方案,但希望它可以帮助别人.我刚才遇到了类似的问题,经过一些谷歌搜索后发现,这种行为的原因是VirtualizationMode的默认值是Recycling.这意味着项目容器被重复使用,因此即使滚动后占据容器的项目不应该着色,背景的颜色也会粘住.

要解决此问题,只需设置VirtualizationMode为Standard,如下所示:

<DataGrid VirtualizingStackPanel.VirtualizationMode="Standard" />

当您滚动,应用您在LoadingRow事件中执行的任何更改时,将重新创建和销毁容器.