我想知道如何改变组合框的背景。我知道您通常可以选择组合框，然后右键单击编辑副本并编辑模板，但由于组合框是数据模板的一部分，我无法选择组合框来执行此操作，我想知道如何做这个？我还尝试复制并粘贴一个普通的组合框模板。但是我接着出现了aero和aero 2主题的错误，但我之前在其他解决方案中使用过这个问题。任何人都可以帮助我吗？
XAML
<DataTemplate x:Key="TreeRootTemplate">
<Border BorderBrush="Black" BorderThickness="1" VerticalAlignment="Center" Background="#F7F7F7" CornerRadius="3">
<StackPanel Margin="2" Width="170" Orientation="Horizontal">
<Image Source="{Binding Icon, Converter={StaticResource ImageToSourceConverter}}" Width="16" Height="16" Margin="5"/>
<ComboBox Width="140" HorizontalContentAlignment="Left" VerticalContentAlignment="Center" ItemsSource="{Binding AvailableSources}" SelectedValuePath="Id" DisplayMemberPath="Name" SelectedItem = "{Binding Source, Mode=TwoWay}" BorderThickness="0">
<ComboBox.Resources>
</ComboBox.Resources>
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding}" Padding="5" Foreground="Black" HorizontalAlignment="Left" VerticalAlignment="Center" FontFamily="{StaticResource FontStyle}"/>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</StackPanel>
</Border>
</DataTemplate>
答案 0 :(得分：1)
您需要确保覆盖default模板和样式。您可以使用默认模板，只需更改适用的背景颜色。
这是一个很好的example。
修改：
以下是自定义Combobox的完整XAML。您可以随意使用不同的颜色来获得您想要的效果。所有的东西都是PaleVioletRed＆＃39;将是一种背景颜色，而青色＆＃39;将是所选项目的背景颜色。
<Grid>
<Grid.Resources>
<Style TargetType="{x:Type ComboBoxItem}">
<Setter Property="SnapsToDevicePixels" Value="true" />
<Setter Property="HorizontalAlignment" Value="Stretch" />
<Setter Property="VerticalAlignment" Value="Stretch" />
<Setter Property="FontSize" Value="16" />
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="Background" Value="PaleVioletRed"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBoxItem">
<Border Name="Border"
Padding="5"
Margin="2"
BorderThickness="2"
CornerRadius="0"
Background="Transparent"
BorderBrush="Transparent" >
<TextBlock TextAlignment="Center">
<ContentPresenter />
</TextBlock>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsHighlighted" Value="true">
<Setter TargetName="Border" Property="BorderBrush" Value="Gray"/>
<Setter TargetName="Border" Property="Background" Value="Cyan"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="ComboBoxToggleButton" TargetType="ToggleButton">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="32" />
</Grid.ColumnDefinitions>
<Border x:Name="Border"
Grid.ColumnSpan="2"
CornerRadius="0"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="2" />
<Border Grid.Column="0"
CornerRadius="0"
Background="Transparent"
BorderBrush="Transparent"
BorderThickness="10" />
<Path x:Name="Arrow"
Grid.Column="1"
Fill="{TemplateBinding Foreground}"
Stroke="{TemplateBinding Foreground}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 8 12 L 16 0 Z"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Border" Property="Background" Value="LightGray" />
<Setter TargetName="Border" Property="BorderBrush" Value="Gray" />
<Setter Property="Foreground" Value="Gray"/>
<Setter TargetName="Arrow" Property="Fill" Value="Gray" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<ControlTemplate x:Key="ComboBoxTextBox" TargetType="TextBox">
<Border x:Name="PART_ContentHost" Focusable="True" />
</ControlTemplate>
<Style TargetType="{x:Type ComboBox}">
<Setter Property="Foreground" Value="Gray" />
<Setter Property="BorderBrush" Value="PaleVioletRed" />
<Setter Property="Background" Value="White" />
<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="FontSize" Value="16" />
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="MinWidth" Value="50"/>
<Setter Property="MinHeight" Value="32"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Name="ToggleButton"
BorderBrush="{TemplateBinding BorderBrush}"
Background="{TemplateBinding Background}"
Foreground="{TemplateBinding Foreground}"
Style="{StaticResource ComboBoxToggleButton}"
Focusable="false"
IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press"/>
<ContentPresenter
Name="ContentSite"
IsHitTestVisible="False"
Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
Margin="10,3,30,3"
VerticalAlignment="Center"
HorizontalAlignment="Center" />
<TextBox x:Name="PART_EditableTextBox"
Style="{x:Null}"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Margin="3,3,23,3"
Focusable="True"
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="PaleVioletRed"
BorderThickness="2"
BorderBrush="Gray"/>
<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="95"/>
</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="0"/>
<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>
</Grid.Resources>
<ComboBox Width="200" Height="75" Background="PaleVioletRed">
<ComboBox.Items>
<ComboBoxItem>test</ComboBoxItem>
<ComboBoxItem>test</ComboBoxItem>
<ComboBoxItem>test</ComboBoxItem>
<ComboBoxItem>test</ComboBoxItem>
</ComboBox.Items>
</ComboBox>
</Grid>