C# 如何在WPF中更改单个选项卡项标题的背景？

我已经在WPF XAML（.NET 4）中对TabControl进行了样式化，我所能做的就是根据触发器对选项卡进行样式化，或者对它们进行相同的样式化。是否只有第一个选项卡的样式不同，而其他选项卡的样式不同于第一个选项卡，但彼此相同（即使用选项卡索引来设置选项卡项的样式）

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谢谢。

您可以使用AlternationCount和AlternationIndex：

<TabControl AlternationCount="{Binding Path=Items.Count,RelativeSource={RelativeSource Self}}">
    <TabControl.ItemContainerStyle>
        <Style TargetType="TabItem">
            <Style.Triggers>
                <Trigger Property="ItemsControl.AlternationIndex"
                            Value="0"> <!-- First item -->
                    <Setter Property="FontWeight"
                            Value="Bold"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </TabControl.ItemContainerStyle>
    <TabItem Header="First"/>
    <TabItem Header="Second"/>
    <TabItem Header="Third"/>
    <TabItem Header="Fourth"/>
</TabControl>

---

如果要更改刚刚选定的选项卡项的背景色，请使用该样式并将该样式应用于选项卡项

<Style TargetType="{x:Type TabItem}" x:Key="TabItemStyle">
    <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TabItem}">
                    <Grid>
                        <Border Name="Border" Background="Red" BorderBrush="#FF1467AF"
                                    BorderThickness="1" 
                                    Margin="0,0,5,0" CornerRadius="8,8,0,0" SnapsToDevicePixels="True">
                            <TextBlock FontFamily="Arial" FontWeight="Bold" FontSize="16" HorizontalAlignment="Center" VerticalAlignment="Center" Name="TextBlock" Foreground="White">
                      <ContentPresenter VerticalAlignment="Center"  HorizontalAlignment="Center" ContentSource="Header" Margin="12,2,12,2"/>
                            </TextBlock>
                        </Border>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsSelected" Value="True">
                            <Setter TargetName="Border" Property="Background" Value="Yellow"/>

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

但是，如果您只想更改第一个选项卡项的背景色，请定义两种样式，并将一种样式应用于第一个选项卡项，将第二种样式应用于另一个选项卡项

选项卡项目1的样式：

<Style TargetType="{x:Type TabItem}" x:Key="TabItemStyleForFirst">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TabItem}">
                    <Grid>
                        <Border Name="Border" Background="Red" BorderBrush="#FF1467AF"
                                    BorderThickness="1" 
                                    Margin="0,0,5,0" CornerRadius="8,8,0,0" SnapsToDevicePixels="True">
                            <TextBlock FontFamily="Arial" FontWeight="Bold" FontSize="16" HorizontalAlignment="Center" VerticalAlignment="Center" Name="TextBlock" Foreground="White">
                      <ContentPresenter VerticalAlignment="Center"  HorizontalAlignment="Center" ContentSource="Header" Margin="12,2,12,2"/>
                            </TextBlock>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
 </Style>

<Style TargetType="{x:Type TabItem}" x:Key="TabItemStyleForOther">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TabItem}">
                    <Grid>
                        <Border Name="Border" Background="Yellow" BorderBrush="#FF1467AF"
                                    BorderThickness="1" 
                                    Margin="0,0,5,0" CornerRadius="8,8,0,0" SnapsToDevicePixels="True">
                            <TextBlock FontFamily="Arial" FontWeight="Bold" FontSize="16" HorizontalAlignment="Center" VerticalAlignment="Center" Name="TextBlock" Foreground="White">
                      <ContentPresenter VerticalAlignment="Center"  HorizontalAlignment="Center" ContentSource="Header" Margin="12,2,12,2"/>
                            </TextBlock>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
 </Style>

其他选项卡项的样式：

<Style TargetType="{x:Type TabItem}" x:Key="TabItemStyleForFirst">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TabItem}">
                    <Grid>
                        <Border Name="Border" Background="Red" BorderBrush="#FF1467AF"
                                    BorderThickness="1" 
                                    Margin="0,0,5,0" CornerRadius="8,8,0,0" SnapsToDevicePixels="True">
                            <TextBlock FontFamily="Arial" FontWeight="Bold" FontSize="16" HorizontalAlignment="Center" VerticalAlignment="Center" Name="TextBlock" Foreground="White">
                      <ContentPresenter VerticalAlignment="Center"  HorizontalAlignment="Center" ContentSource="Header" Margin="12,2,12,2"/>
                            </TextBlock>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
 </Style>

<Style TargetType="{x:Type TabItem}" x:Key="TabItemStyleForOther">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TabItem}">
                    <Grid>
                        <Border Name="Border" Background="Yellow" BorderBrush="#FF1467AF"
                                    BorderThickness="1" 
                                    Margin="0,0,5,0" CornerRadius="8,8,0,0" SnapsToDevicePixels="True">
                            <TextBlock FontFamily="Arial" FontWeight="Bold" FontSize="16" HorizontalAlignment="Center" VerticalAlignment="Center" Name="TextBlock" Foreground="White">
                      <ContentPresenter VerticalAlignment="Center"  HorizontalAlignment="Center" ContentSource="Header" Margin="12,2,12,2"/>
                            </TextBlock>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
 </Style>

使用数据触发器有什么问题？可能会使用它，但我是否可以将样式仅应用于一个选项卡项？您很可能需要一个自定义转换器，用于返回其父项

项
集合中每个
选项卡项的索引；其余的都与触发器无关。