为 ListBox 中的选定项设置背景颜色

我无法为列表框上的所选项目设置背景颜色.我不想要这个例子中的交替颜色.我把它们作为测试，它们起作用了.Trigger IsSelected 正在触发，因为 fontweight 变为粗体并且前景变为红色.将高亮颜色画笔设置为 SteelBlue 并没有达到预期的效果，因为它会在 ListBox 失去焦点时消失.当 ListBox 失去焦点时，红色和粗体确实成立，这正是我想要的.我希望所选项目的背景颜色保持不变.现在所选项目的背景是白色的，并在 ListBox 失去焦点时保持.感谢您的帮助，我会测试任何建议的修复.

I cannot set the background color for the selected item on a list box. I don't want the alternating colors in this example. I put them in as a test and they work. Trigger IsSelected is firing as the fontweight goes to bold and the foreground goes to red. Setting highlight color brush to SteelBlue does not achieve the desired effect as it goes away when the ListBox loses focus. Red and bold does hold when the ListBox loses focus and is what I want. I want the background color to take and hold for the selected item. Right now the background for the selected items is white and holds when the ListBox loses focus. Thanks for your help and I will test any proposed fix.

    <ListBox Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="1" Name="WFEnum" Visibility="Visible" BorderThickness="2" Margin="1" Padding="2,2,7,2"
             ItemsSource="{Binding Path=SearchItem.SrchWorkFlows}" HorizontalAlignment="Left" 
             PresentationTraceSources.TraceLevel="High" AlternationCount="2" >
        <ListBox.ItemContainerStyle>
            <Style TargetType="ListBoxItem">
                <Setter Property="VerticalContentAlignment" Value="Center" />
                <Style.Triggers>
                    <Trigger Property="ItemsControl.AlternationIndex" Value="0">
                        <Setter Property="Background" Value="LightGreen"></Setter>
                    </Trigger>
                    <Trigger Property="ItemsControl.AlternationIndex" Value="1">
                        <Setter Property="Background" Value="LightPink"></Setter>
                    </Trigger>
                    <Trigger Property="IsSelected" Value="True" >
                        <Setter Property="FontWeight" Value="Bold" />
                        <Setter Property="Background" Value="SteelBlue" />
                        <Setter Property="Foreground" Value="Red" />
                    </Trigger>
                </Style.Triggers>
                <Style.Resources>
                    <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Transparent"/>
                </Style.Resources>
            </Style>
        </ListBox.ItemContainerStyle>
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Path=Name, Mode=OneWay}" Background="Transparent" />
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>