我有一个自定义数据网格，其单元格的样式如下
<Style x:Key="CellStyleBase"
TargetType="{x:Type DataGridCell}">
<Setter Property="Visibility"
Value="Visible" />
<Setter Property="Background"
Value="{Binding RelativeSource={RelativeSource Self}, Path=Column.Header.CellBackground}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type DataGridCell}">
<Grid x:Name="BackgroundGrid"
Background="{TemplateBinding Background}">
<TextBlock Text="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Text}"
HorizontalAlignment="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Column.Header.CellHorzontalAlignment}"
VerticalAlignment="Center"
FontWeight="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Column.Header.CellFontWeight}"
Margin="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Margin}"
Padding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Padding}" />
<Grid.LayoutTransform>
<TransformGroup>
<RotateTransform Angle="-90" />
</TransformGroup>
</Grid.LayoutTransform>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
数据网格的样式如下
<Style TargetType="{x:Type local:CustomDataGrid}">
<Setter Property="BorderThickness"
Value="1" />
<!-- This is needed to force DG to have a non-default value. Otherwise the DGR.DetailsVisibility cannot have a value of VisibleWhenSelected by default. -->
<Setter Property="RowDetailsVisibilityMode"
Value="VisibleWhenSelected" />
<Setter Property="ScrollViewer.CanContentScroll"
Value="true" />
<Setter Property="VirtualizingPanel.IsVirtualizing"
Value="True" />
<Setter Property="VirtualizingPanel.VirtualizationMode"
Value="Recycling" />
<Setter Property="ScrollViewer.IsDeferredScrollingEnabled"
Value="True" />
<Setter Property="EnableColumnVirtualization"
Value="True" />
<Setter Property="EnableRowVirtualization"
Value="True" />
<Setter Property="LayoutTransform">
<Setter.Value>
<TransformGroup>
<RotateTransform Angle="90" />
</TransformGroup>
</Setter.Value>
</Setter>
<Setter Property="CellStyle"
Value="{StaticResource CellStyleBase}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:CustomDataGrid}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
SnapsToDevicePixels="True"
Padding="{TemplateBinding Padding}">
<ScrollViewer Focusable="false"
Name="DG_ScrollViewer">
<ScrollViewer.Template>
<ControlTemplate TargetType="{x:Type ScrollViewer}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<!--Left Column Header Corner -->
<Border BorderBrush="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:CustomDataGrid}}, Path=HeaderBorderBrush}"
BorderThickness="0,0,1,0"
Background="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:CustomDataGrid}}, Path=HeaderBackground}"
Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Path=CellsPanelHorizontalOffset}"
Visibility="Collapsed" />
<!--Column Headers-->
<DataGridColumnHeadersPresenter Grid.Column="1"
Name="PART_ColumnHeadersPresenter"
Visibility="Visible">
<DataGridColumnHeadersPresenter.Style>
<Style TargetType="{x:Type DataGridColumnHeadersPresenter}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type DataGridColumnHeadersPresenter}">
<Border Background="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:CustomDataGrid}}, Path=NameHeaderBackground}">
<ItemsPresenter />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</DataGridColumnHeadersPresenter.Style>
</DataGridColumnHeadersPresenter>
<!--Column Header Splitter-->
<GridSplitter Grid.Row="1"
Grid.Column="0"
Grid.ColumnSpan="2"
Height="4"
HorizontalAlignment="Stretch"
Background="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:CustomDataGrid}}, Path=NameHeaderBackground}"
Foreground="Transparent"
Cursor="SizeWE" />
<!-- Line separates the column header with the content-->
<Canvas Grid.Row="1"
Grid.Column="0"
Grid.ColumnSpan="2"
Height="1.5"
HorizontalAlignment="Stretch"
VerticalAlignment="Bottom"
Background="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:CustomDataGrid}}, Path=HorizontalGridLinesBrush}" />
<!--DataGrid content-->
<ScrollContentPresenter x:Name="PART_ScrollContentPresenter"
Grid.Row="2"
Grid.ColumnSpan="2"
CanContentScroll="{TemplateBinding CanContentScroll}" />
<ScrollBar Grid.Row="0"
Grid.RowSpan="3"
Grid.Column="2"
Name="PART_VerticalScrollBar"
Orientation="Vertical"
Maximum="{TemplateBinding ScrollableHeight}"
ViewportSize="{TemplateBinding ViewportHeight}"
Value="{Binding Path=VerticalOffset, RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}"
Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
Style="{StaticResource ScrollBarStyle}" />
<Grid Grid.Row="3"
Grid.Column="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}, Path=NonFrozenColumnsViewportHorizontalOffset}" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<ScrollBar Grid.Column="1"
Name="PART_HorizontalScrollBar"
Orientation="Horizontal"
Maximum="{TemplateBinding ScrollableWidth}"
ViewportSize="{TemplateBinding ViewportWidth}"
Value="{Binding Path=HorizontalOffset, RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}"
Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
Style="{StaticResource ScrollBarStyle}" />
</Grid>
</Grid>
</ControlTemplate>
</ScrollViewer.Template>
<ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</ScrollViewer>
</Border>
<ControlTemplate.Triggers>
<Trigger SourceName="DG_ScrollViewer"
Property="ComputedVerticalScrollBarVisibility"
Value="Visible">
<Setter Property="IsShowingHorizontalScrollBar"
Value="True" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
在datagrid中，行将使用后台线程动态添加，并且可以包含数千个数据。 datagrid存在性能问题。 CPU使用率不断增加。
我发现原因是LayoutTransform。如果我设置Height的{{1}}或DataGridCell Width这是单元格的内容，则CPU使用率会降低。但我不能硬编码。应根据内容的长度设置宽度。
设置硬编码高度：
Grid设置硬编码宽度：
<Setter Property="Height"
Value="50" />
首先，我尝试绑定一个传递内容的转换器，并计算宽度并返回<Grid x:Name="BackgroundGrid"
Background="{TemplateBinding Background}"
Width="50">
<TextBlock Text="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Text}"
HorizontalAlignment="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Column.Header.CellHorzontalAlignment}"
VerticalAlignment="Center"
FontWeight="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Column.Header.CellFontWeight}"
Margin="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Margin}"
Padding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Padding}" />
<Grid.LayoutTransform>
<TransformGroup>
<RotateTransform Angle="-90" />
</TransformGroup>
</Grid.LayoutTransform>
</Grid>
Width属性。这会导致闪烁，同时添加新数据并增加CPU使用率。
Grid其次，我将<Grid x:Name="BackgroundGrid"
Background="{TemplateBinding Background}"
Width="{Binding Path=Content.Text,RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Converter={StaticResource WidthConverter}}">
<TextBlock Text="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Text}"
HorizontalAlignment="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Column.Header.CellHorzontalAlignment}"
VerticalAlignment="Center"
FontWeight="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Column.Header.CellFontWeight}"
Margin="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Margin}"
Padding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridCell}},Path=Content.Padding}" />
<Grid.LayoutTransform>
<TransformGroup>
<RotateTransform Angle="-90" />
</TransformGroup>
</Grid.LayoutTransform>
</Grid>
替换为LayoutTransform。单元格的宽度不会根据将导致仅显示部分数据的内容而增加。
第三，我尝试将属性绑定到RenderTransform的{{1}}，Height动态更新DataGridCell中值的最大宽度。这也消耗了CPU使用率。
除DataGridCell以外，还有其他替代方法可以达到LayoutTransform的结果吗？
期待任何形式的意见/建议。感谢。
答案 0 :(得分：0)
我会尝试在渲染逻辑本身中进行转换。我自己没有试过这个，但我认为值得一试，看看这是否会提供与使用RenderTransform相似的性能，同时还会给你如果你使用{{1}的结果用RotatedText代替TextBlock：
LayoutTransform