【发布时间】：2017-02-15 14:45:44
【问题描述】：
我有一个带有 2 个固定列的 DataGrid，可以毫无问题地对其进行排序。
<DataGrid Name="SelectedObjectsGrid"
Visibility="{Binding ShowSelectedObjectsInfoPanel, Converter={StaticResource BoolNegationToVisibilityConverter}}"
ItemsSource="{Binding SelectedObjectItems}"
SelectionMode="Extended"
CanUserAddRows="False"
AutoGenerateColumns="False"
VirtualizingPanel.IsVirtualizing="True"
VirtualizingPanel.IsVirtualizingWhenGrouping="True"
VirtualizingPanel.VirtualizationMode="Standard"
IsReadOnly="True"
Grid.Row="0" Margin="0,0,4,0">
<DataGrid.RowStyle>
<Style TargetType="DataGridRow" BasedOn="{StaticResource Theme.DataGrid.Row.Style}">
<Setter Property="ContextMenu" Value="{StaticResource SelectedObjectRowContextMenu}" />
<EventSetter Event="MouseDoubleClick" Handler="SelectedObjectsRow_DoubleClick" />
</Style>
</DataGrid.RowStyle>
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{ui:CommandHandler ObjectsGridSelectionChangedCommand}" CommandParameter="{Binding SelectedItems,ElementName=SelectedObjectsGrid}">
</i:InvokeCommandAction>
</i:EventTrigger>
</i:Interaction.Triggers>
<DataGrid.GroupStyle>
<!-- Style for groups at top level. -->
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Margin" Value="0,0,0,5"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="{Binding Path=Name.IsExpanded}"
Tag="{Binding Path=Name}"
Background="#FF112255" BorderBrush="#FF002255"
Foreground="#FFEEEEEE" BorderThickness="1,1,1,5">
<Expander.ContextMenu>
<ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
<MenuItem Header="{DynamicResource XpStrKeepSelectionTableShort}" Command="{ui:CommandHandler KeepTable}" CommandParameter="{Binding Name}" />
<MenuItem Header="{DynamicResource XpStrRemoveSelectionTableShort}" Command="{ui:CommandHandler RemoveTable}" CommandParameter="{Binding Name}" />
<Separator/>
<MenuItem Header="{DynamicResource XpStrList}" Command="{ui:CommandHandler ToggleSelectedObjectsGrouping}" CommandParameter="False" >
<MenuItem.Icon>
<Image>
<Image.Source>
<DrawingImage>
<DrawingImage.Drawing>
<GeometryDrawing Brush="Black" Geometry="{Binding DataContext.AreSelectedObjectsGroupedByTable,
Source={x:Reference SelectedObjectsGrid}, Converter={StaticResource BoolNegationToGeometryConverter}}" />
</DrawingImage.Drawing>
</DrawingImage>
</Image.Source>
</Image>
</MenuItem.Icon>
</MenuItem>
<MenuItem Header="{DynamicResource XpStrGroups}" Command="{ui:CommandHandler ToggleSelectedObjectsGrouping}" CommandParameter="True" >
<MenuItem.Icon>
<Image>
<Image.Source>
<DrawingImage>
<DrawingImage.Drawing>
<GeometryDrawing Brush="Black" Geometry="{Binding DataContext.AreSelectedObjectsGroupedByTable,
Source={x:Reference SelectedObjectsGrid}, Converter={StaticResource BoolToGeometryConverter}}" />
</DrawingImage.Drawing>
</DrawingImage>
</Image.Source>
</Image>
</MenuItem.Icon>
</MenuItem>
<Separator Visibility="{Binding DataContext.AreSelectedObjectsGroupedByTable, Source={x:Reference SelectedObjectsGrid}, Converter={StaticResource BoolToVisibilityConverter}}" />
<MenuItem Header="{DynamicResource XpStrHintTreeExpandAll}" Command="{ui:CommandHandler ExpandOrCollapseAll}" CommandParameter="True"
Visibility="{Binding DataContext.SelectedObjectsGroupHeaders.DoCollapsedGroupsExist,
Source={x:Reference SelectedObjectsGrid}, Converter={StaticResource BoolToVisibilityConverter}}">
<MenuItem.Icon>
<Image Source="{Binding Converter={StaticResource nameToBitmapSource}}" DataContext="BmpTreeExpandAll"/>
</MenuItem.Icon>
</MenuItem>
<MenuItem Header="{DynamicResource XpStrHintTreeCollapseAll}" Command="{ui:CommandHandler ExpandOrCollapseAll}" CommandParameter="False"
Visibility="{Binding DataContext.SelectedObjectsGroupHeaders.DoExpandedGroupsExist,
Source={x:Reference SelectedObjectsGrid}, Converter={StaticResource BoolToVisibilityConverter}}">
<MenuItem.Icon>
<Image Source="{Binding Converter={StaticResource nameToBitmapSource}}" DataContext="BmpTreeCollapseAll"/>
</MenuItem.Icon>
</MenuItem>
</ContextMenu>
</Expander.ContextMenu>
<Expander.Header>
<DockPanel>
<TextBlock FontWeight="Bold" Margin="5,0,0,0" IsHitTestVisible="False">
<Run Text="{Binding Path=Name.Description, Mode=OneWay}" />
<Run Text=" ("/>
<Run Text="{Binding Path=Name.GroupedCount, Mode=OneWay}" />
<Run Text=")"/>
</TextBlock>
</DockPanel>
</Expander.Header>
<Expander.Content>
<ItemsPresenter/>
</Expander.Content>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</DataGrid.GroupStyle>
<DataGrid.Columns>
<DataGridTextColumn Header="{DynamicResource XpStrLabel}" Binding="{Binding Data.Label}" SortDirection="Ascending"/>
<DataGridTextColumn Header="{DynamicResource XpStrClass}" Binding="{Binding Data.Class.Name}" />
</DataGrid.Columns>
</DataGrid>
当程序正确初始化后，我调用下面的方法来添加无法排序的动态列：
我有一段代码添加：
private void AddDynamicColumns()
{
var separator = new char[] {';', ':'};
foreach (var parameter in Parameters.Instance.GetParameters("SelectedObjectsDynField"))
{
var values = parameter.StringValue.Split(separator);
var fieldName = values[0];
var fieldDescr = fieldName;
if (values.Length > 1)
fieldDescr = values[1];
var col = new DataGridTextColumn();
col.CanUserSort = true;
col.Header = fieldDescr;
var bind = new MultiBinding();
bind.Converter = new NetObjectToPrintableFieldValueConverter();
bind.Bindings.Add(new Binding("Data"));
bind.Bindings.Add(new Binding() { Source = fieldName });
col.Binding = bind;
SelectedObjectsGrid.Columns.Add(col);
}
}
这可能是什么原因？
编辑：添加
col.SortMemberPath = fieldName
使它有点工作，但它破坏了虚拟化。填充 DataGrid 现在需要 20 倍的时间。此外，排序不会正确排序行。单击第二次动态列对其进行降序排序没有任何作用。
【问题讨论】：
-
添加的类型是否实现
IComparable？ -
列的绑定属性中的数据是整数或字符串。请参阅我关于丢失虚拟化和错误排序的编辑。
-
这是一个已知问题。看看这是否有帮助：stackoverflow.com/a/34864070/5615980
-
谢谢！ WPF DataGrid 真的很烂。我的猜测是它永远不会准备好。 Hello worlds 既好又简单，但任何涉及任何甚至远程复杂的东西都几乎不可能实现。即使是经验丰富的开发人员。