WPF中的触发器不工作

ListView ,与 ListView.View 作为 GridView .

默认情况下 mouseOver 正在工作, ListViewItem 鼠标悬停时突出显示,单击时选中。但在我修改了 ControlTemplate

我用了扳机,但没用。

<Style x:Key="filesListViewItemStyle" TargetType="{x:Type ListViewItem}">
            <Setter Property="IsSelected" Value="{Binding FileIsSelected}"/>
            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListViewItem">
                        <Grid Height="40">
                            <GridViewRowPresenter/>
                            <Line X1="0.0" Y1="0.0" X2="{Binding ActualWidth, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListView}}}" Y2="0.0" StrokeThickness="1" StrokeDashArray="2" Stroke="Gray" />
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="Green"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

在我的模板中,我实际上在两行代码之间添加了一行作为分隔符 .

我只是不明白为什么扳机不起作用!