我有一个自定义组合框，我在第一个项目上应用特定样式。我希望在选择此项目时，组合框中显示的文本样式是相同的。目前，所有选定的项目都以相同的样式显示，我不知道如何制作ContentPresenter＆＃34; get＆＃34;该项目中指定的样式。这是代码：
<ComboBox HorizontalAlignment="Center" Margin="0,106,0,0" VerticalAlignment="Top" Width="200">
<ComboBoxItem Style="{StaticResource mySpecialStyle}">Select an option...</ComboBoxItem>
<ComboBoxItem>ComboBox Item #1</ComboBoxItem>
<ComboBoxItem>ComboBox Item #2</ComboBoxItem>
<ComboBoxItem>ComboBox Item #3</ComboBoxItem>
</ComboBox>
事实上，＆＃34; mySpecialStyle＆＃34;只更改颜色和fontstyle。但是当选择第一个项目时，它看起来就像任何其他所选项目一样。如何在Contentpresenter上设置它？
以下是自定义ComBoBox的完整代码：
<Window.Resources>
<Style x:Key="mySpecialStyle" TargetType="{x:Type ComboBoxItem}">
<Setter Property="TextElement.FontStyle" Value="Italic"/>
</Style>
<ControlTemplate x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<Border
x:Name="Border"
Grid.ColumnSpan="3"
CornerRadius="3"
Background="#FFFAFAFA"
BorderBrush="#FF999999"
BorderThickness="1" />
<Border
x:Name="Background"
Grid.Column="0"
CornerRadius="3,0,0,3"
Margin="1"
Background="#FFFAFAFA"
BorderBrush="#FF999999"
BorderThickness="0" />
<Path
x:Name="ArrowDw"
Grid.Column="1"
Fill="#FF404040"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 4 4 L 8 0 Z"/>
<Path
x:Name="ArrowUp"
Grid.Column="1"
Fill="Transparent"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 2 L 4 -2 L 8 2 Z"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsMouseOver" Value="true">
<Setter TargetName="ArrowDw" Property="Fill" Value="#FF000000" />
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="true">
<Setter TargetName="Background" Property="Background" Value="#FFFFFFFF" />
<Setter TargetName="Border" Property="BorderBrush" Value="#FF000000" />
<Setter TargetName="Border" Property="Background" Value="#FFFFFFFF" />
<Setter TargetName="ArrowDw" Property="Fill" Value="Transparent" />
<Setter TargetName="ArrowUp" Property="Fill" Value="#FF404040" />
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="ToggleButton.IsChecked" Value="True" />
<Condition Property="ToggleButton.IsMouseOver" Value="True" />
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter TargetName="ArrowUp" Property="Fill" Value="#FF000000" />
</MultiTrigger.Setters>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Border" Property="Background" Value="#FFFFFF" />
<Setter TargetName="Border" Property="BorderBrush" Value="#CCCCCC" />
<Setter Property="Foreground" Value="#888888"/>
<Setter TargetName="ArrowDw" Property="Fill" Value="#999999" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<ControlTemplate x:Key="ComboBoxTextBox" TargetType="{x:Type TextBox}">
<Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}"/>
</ControlTemplate>
<Style x:Key="{x:Type ComboBox}" TargetType="{x:Type ComboBox}">
<Setter Property="SnapsToDevicePixels" Value="true"/>
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
<Setter Property="MinHeight" Value="27"/>
<Setter Property="ToolTip" Value="{Binding Path=SelectionBoxItem, RelativeSource={RelativeSource Self}}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBox}">
<Grid>
<ToggleButton
Name="ToggleButton"
Template="{StaticResource ComboBoxToggleButton}"
Grid.Column="2"
Focusable="false"
IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press">
</ToggleButton>
<ContentPresenter
Name="ContentSite"
IsHitTestVisible="False"
Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
????
Margin="8,3,28,3"
VerticalAlignment="Center"
HorizontalAlignment="Left" />
<TextBox x:Name="PART_EditableTextBox"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Margin="8,3,28,3"
Focusable="True"
Background="Transparent"
Visibility="Hidden"
IsReadOnly="{TemplateBinding IsReadOnly}"/>
<Popup
Name="Popup"
Placement="Bottom"
IsOpen="{TemplateBinding IsDropDownOpen}"
AllowsTransparency="True"
Focusable="False"
PopupAnimation="Slide">
<Grid
Name="DropDown"
SnapsToDevicePixels="True"
MinWidth="{TemplateBinding ActualWidth}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<Border
x:Name="DropDownBorder"
Background="#FFFFFF"
BorderThickness="1"
BorderBrush="#FF999999"/>
<ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
<StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained"/>
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="HasItems" Value="false">
<Setter TargetName="DropDownBorder" Property="MinHeight" Value="27"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="#888888"/>
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
<Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true">
<Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4"/>
<Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/>
</Trigger>
<Trigger Property="IsEditable" Value="true">
<Setter Property="IsTabStop" Value="false"/>
<Setter TargetName="PART_EditableTextBox" Property="Visibility" Value="Visible"/>
<Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
</Style.Triggers>
</Style>
</Window.Resources>
占位符＆＃34; ???＆＃34;我需要根据ComboBoxitem中定义的样式设置样式（在这种情况下，＆＃34; mySpecialStyle＆＃34;）。
提前致谢！
答案 0 :(得分：0)
这里要解决的逻辑当然会基于像Trigger这样的东西。但是，我们无法通过Style设置Setter。所以我想到了这个黑客（但足够安全）。首先，您需要将Style的{{1}}绑定到其ContentPresenter属性（默认情况下为2路绑定）。然后，您只需将Tag更改为Tag，其中{StaticResource}与您在树上向上定义的资源相同。该资源当然应该ResourceKey TargetType：
ContentPresenter