多数据触发器不起作用？

Question

我想为我的 TabControl 配备一个 MultiDataTrigger。当选项卡悬停时，它应该改变颜色。但如果选择了选项卡则不会。我尝试了多数据触发器。但这似乎不起作用。这是我的风格：

<Style TargetType="{x:Type TabItem}">
<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="{x:Type TabItem}">
            <Grid>
                <Border Name="Border" BorderBrush="Black" BorderThickness="0.5,0.5,0.5,0" CornerRadius="4,4,0,0">
                    <ContentPresenter x:Name="ContentSite" VerticalAlignment="Center" HorizontalAlignment="Center" ContentSource="Header" Margin="12,2,12,2"/>
                </Border>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter TargetName="Border" Property="Background">
                        <Setter.Value>
                            <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                <GradientStop Color="#fefeff" Offset="0" />
                                <GradientStop Color="#e7edf6" Offset="1" />
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>
                </Trigger>
                <Trigger Property="IsSelected" Value="False">
                    <Setter TargetName="Border" Property="Background">
                        <Setter.Value>
                            <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                <GradientStop Color="#c5d0df" Offset="0" />
                                <GradientStop Color="#aab4c2" Offset="1" />
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>
                </Trigger>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition Binding="{Binding Path=IsMouseOver}" Value="True" />
                        <Condition Binding="{Binding Path=IsSelected}" Value="False" />
                    </MultiDataTrigger.Conditions>
                    <Setter TargetName="Border" Property="Background">
                        <Setter.Value>
                            <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                <GradientStop Color="#dde6f2" Offset="0" />
                                <GradientStop Color="#c6d0de" Offset="1" />
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>
                </MultiDataTrigger>

            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Setter.Value>
</Setter>

有什么问题吗？

Answer 1

将触发器更改为：

<MultiTrigger.Conditions>
    <Condition Property="IsSelected" Value="false"/>
    <Condition Property="IsMouseOver" Value="true"/>
</MultiTrigger.Conditions>

根据AngelWPF的回答，DataTrigger将尝试绑定到当前的 DataContext，它将在其中找不到与属性匹配的内容。

Answer 2

DataTriggers 使用DataContext 作为源。我确信 IsMouseOver 和 IsSelected 不是数据上下文中的属性，它们是选项卡项的属性。

我建议使用普通的 MultiTrigger 和普通的 Trigger Condition。