ItemContainerStyle禁用ListBox的ItemTemplateSelector。為什么？

在我的 WPF 應用程式（.NET 6.0）中，我有一個ItemContainerStylefor aListBoxItem我已經在ListBoxes 上成功使用了一段時間。但就在今天，我嘗試ListBox在我也設定ItemTemplateSelector屬性的地方使用它。我發現我的風格導致選擇器被簡單地忽略。

除錯器輸出視窗中沒有警告或錯誤訊息，也沒有拋出例外。只是該SelectTemplate方法永遠不會被呼叫。所以我最終得到了一個裝滿文本類名稱的框。但是，如果我ItemContainerStyle從 中洗掉ListBox，一切正常，并且SelectTemplate為每個專案呼叫。但后來我ListBoxItem的 s 看起來不像我想要的那樣。

下面是我的ItemContainerStyle。只要我ItemContainerStyle在 ListBox 上使用它，我就可以輕松地在測驗應用程式中重現相同的效果。任何人都可以找出可能導致ItemTemplateSelector簡單忽略的內容嗎？

<Style x:Key="ListBoxItemStyle" TargetType="{x:Type ListBoxItem}">
    <Setter Property="Padding"                     Value="3,0,3,0" />
    <Setter Property="HorizontalContentAlignment"  Value="Stretch" />
    <Setter Property="VerticalContentAlignment"    Value="Top" />
    <Setter Property="Background"                  Value="Transparent" />
    <Setter Property="BorderBrush"                 Value="Transparent" />
    <Setter Property="BorderThickness"             Value="1" />
    <Setter Property="SnapsToDevicePixels"         Value="True" />
    <Setter Property="Foreground"                  Value="{StaticResource GsForegroundLight}" />
    <Setter Property="KeyboardNavigation.TabNavigation" Value="Local" />

    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                <Grid>
                    <Border
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        CornerRadius="1"
                        SnapsToDevicePixels="True" />

                    <!--  MouseOver Visual is exactly like Selected Visual (below) minus the rounded corners  -->

                    <Border
                        x:Name="MouseOverVisual"
                        BorderBrush="{StaticResource GsForegroundLight}"
                        BorderThickness="1"
                        CornerRadius="3"
                        Opacity="0"
                        SnapsToDevicePixels="True">
                        <Border BorderThickness="1" CornerRadius="3" SnapsToDevicePixels="True">
                            <Border.Background>
                                <LinearGradientBrush Opacity="0.5" StartPoint="0.5,0" EndPoint="0.5,1">
                                    <GradientStop Offset="1" Color="{StaticResource GsBackgroundDarkColor}" />
                                    <GradientStop Color="Gray" />
                                </LinearGradientBrush>
                            </Border.Background>
                        </Border>
                    </Border>

                    <!--  Selected Visual uses no border but just a gradient background brush  -->

                    <Border x:Name="SelectedVisual"
                        BorderThickness="0"
                        CornerRadius="3"
                        Opacity="0"
                        SnapsToDevicePixels="True">
                        <Border
                            BorderBrush="Black"
                            BorderThickness="1"
                            CornerRadius="3"
                            SnapsToDevicePixels="True">
                            <Border.Background>
                                <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1">
                                    <GradientStop Offset="1" Color="{StaticResource GsBackgroundDarkColor}" />
                                    <GradientStop Color="Gray" />
                                </LinearGradientBrush>
                            </Border.Background>
                        </Border>
                    </Border>
                    <ContentPresenter x:Name="contentPresenter"
                        Margin="{TemplateBinding Padding}"
                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                        VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                        Content="{TemplateBinding Content}"
                        ContentStringFormat="{TemplateBinding ContentStringFormat}"
                        ContentTemplate="{TemplateBinding ContentTemplate}" />

                    <!--  JMO: Removed the focus visual altogether by setting border thickness to zero  -->
                    <Border  x:Name="FocusVisual"
                        BorderBrush="#FFFFC92B"
                        BorderThickness="0"
                        CornerRadius="1"
                        Opacity="0"
                        SnapsToDevicePixels="True" />
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="CommonStates">
                            <VisualState x:Name="Normal" />
                            <VisualState x:Name="MouseOver">
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="MouseOverVisual"
                                        Storyboard.TargetProperty="Opacity"
                                        To="1"
                                        Duration="0" />
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="Disabled">
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="contentPresenter"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.5"
                                        Duration="0" />
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                        <VisualStateGroup x:Name="SelectionStates">
                            <VisualState x:Name="Unselected" />
                            <VisualState x:Name="Selected">
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="SelectedVisual"
                                        Storyboard.TargetProperty="Opacity"
                                        To="1"
                                        Duration="0" />
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                        <VisualStateGroup x:Name="FocusStates">
                            <VisualState x:Name="Focused">
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="FocusVisual"
                                        Storyboard.TargetProperty="Opacity"
                                        To="1"
                                        Duration="0" />
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="Unfocused" />
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>  

uj5u.com熱心網友回復：

ContentPresenter 本身從 ContentControl 接收資料。您已為其屬性??設定系結。也許這就是為什么這個自動機制對他關閉的原因。
嘗試像在默認 ListBoxItem 模板中那樣設定它。

    <ContentPresenter
        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
        SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
        VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>

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