[求助]请问在treeview中，选中一项后，背景色整个一行变色？

[JimCarter]

实现如图所示的效果。
现在尝试了各种办法均不成功，左边总是会缺一块。

[郑州高新区WPF小王子]

改成你自己的样式

   <Style x:Key="treeViewItemStyle" TargetType="TreeViewItem">
             <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TreeViewItem}">
                    <Grid x:Name="grid">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        <ToggleButton Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2"  Panel.ZIndex="3" Width="15" HorizontalAlignment="Left" Height="15" x:Name="Expander" ClickMode="Press"  IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"/>
                        <Border x:Name="Bd" Grid.Row="0" Margin="-40,0,0,0"  VerticalAlignment="Center"  Grid.Column="0"   BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                            <ContentPresenter VerticalAlignment="Bottom" Margin="70,0,0,0" x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                        </Border>
                        <ItemsPresenter x:Name="ItemsHost" Margin="20,0,0,0" Grid.Column="0" Grid.Row="1"/>
                    </Grid>
                   <ControlTemplate.Triggers>
                        <Trigger Property="IsExpanded" Value="false">
                            <Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
                        </Trigger>
                        <Trigger Property="IsExpanded" Value="true">
                            <Setter Property="Visibility" TargetName="ItemsHost" Value="Visible"/>
                        </Trigger>
                        <Trigger Property="HasItems" Value="false">
                            <Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
                        </Trigger>
                        <Trigger Property="IsSelected" Value="true">
                            <Setter Property="Background" TargetName="Bd" Value="Red"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="False"></Condition>
                                <Condition Property="IsMouseOver" SourceName="Bd" Value="True"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Background" TargetName="Bd" Value="Red"/>
                        </MultiTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        </Style>

[JimCarter]

感谢版主的回答，不过当层级较多的时候，效果就不对了，如图：


最后采用的解决方法是，根据当前Item的层级，动态的改变其margin。

[郑州高新区WPF小王子]

引用 2 楼 catshitone 的回复:

感谢版主的回答，不过当层级较多的时候，效果就不对了，如图： 最后采用的解决方法是，根据当前Item的层级，动态的改变其margin。

你太聪明了！