【WPF】WPF ListBox，TreeView的SelectedItem失去焦点的颜色

            <ListBox>
                <ListBox.ItemContainerStyle>
                    <Style TargetType="{x:Type ListBoxItem}">
                        /*这一段是关键*/
                        <Style.Resources>
                            <!--SelectedItem with focus-->
                            <!--<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="AliceBlue"/>-->
                            <!--SelectedItem without focus-->
                            <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="LightSkyBlue" />
　　　　　　　　　　　　　　</Style.Resources>
                        <Setter Property="Padding" Value="8"></Setter>
                        <Setter Property="VerticalContentAlignment" Value="Center"></Setter>
                        <Style.Triggers>
                            <Trigger  Property="IsSelected" Value="true">
                                <Setter Property="Background" Value="LightSkyBlue" />
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}" />
                                <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" />
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </ListBox.ItemContainerStyle>
            </ListBox>

 上面无效的话，使用下方的代码试试：（针对的是treeview，当然listbox也通用）

<TreeView.ItemContainerStyle>
  <Style TargetType="{x:Type TreeViewItem}">
    <Style.Resources>
      <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="DodgerBlue"/>
      <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="White"/>
      <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}" Color="DodgerBlue"/>
      <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}" Color="White"/>
    </Style.Resources>        
  </Style>
</TreeView.ItemContainerStyle>

 更新：2021-08-29

我也是刚发现的问题，windows10系统貌似上述2个方法都不行，让人抓狂。

最后百度总算找到解决方法：原文：https://blog.csdn.net/qq_40841733/article/details/90778121

 <Style x:Key="FileListBoxItem" TargetType="{x:Type ListBoxItem}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ListBoxItem}">
                        <Border x:Name="Bd" SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
                            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" x:Name="contentPresenter"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="Yellow"/>
                            </Trigger>
                            <Trigger Property="IsSelected" Value="True">
                                <Setter Property="Background" Value="LightSkyBlue"/>
                            </Trigger>
                            <MultiTrigger>
                                <MultiTrigger.Conditions>
                                    <Condition Property="IsSelected" Value="true"/>
                                    <Condition Property="Selector.IsSelectionActive" Value="false"/>
                                </MultiTrigger.Conditions>
                                <Setter Property="Background" TargetName="Bd" Value="LightSkyBlue"/>
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
                            </MultiTrigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>