WPF更改组合框的背景颜色答案

【问题标题】：WPF Change Background color of a ComboboxWPF更改组合框的背景颜色
【发布时间】：2019-05-15 11:01:41
【问题描述】：

在我的 WPF 应用程序中，我只想更改组合框的背景颜色。我不是指下拉菜单，我想要的只是选择了任何项目并设置了背景。就像设置按钮的背景一样 - 当控件显示在屏幕上时，它应该具有浅黄色背景。而已。我在网上搜索了很多，但到处都可以找到下拉背景颜色的解决方案。我尝试将 SolidColorBrush 和 Style.Triggers 应用于 Combobox 的 TextBlock，但没有成功。通过添加 SolidColorBrush 线条，我设置了下拉背景，但这不是我想要的。我的代码是：

<ComboBox ItemsSource="{Binding MtrCm}" SelectedValue="{Binding WellboreDiameter_Unit, Mode=TwoWay}" Grid.Row="1" Height="23" HorizontalAlignment="Right" Margin="0,26,249,0" x:Name="cboWellDiameter" VerticalAlignment="Top" Width="120"   Background="LightYellow"  >
    <ComboBox.Resources>
        <SolidColorBrush x:Key="{x:Static SystemColors.WindowBrushKey}" Color="Yellow" />
        <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Yellow" />
        <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Yellow" />
        <Style TargetType="TextBlock">
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsSelected, RelativeSource={RelativeSource AncestorType=ComboBoxItem}}" Value="True">
                    <Setter Property="Background" Value="Red" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ComboBox.Resources>
</ComboBox>

谁能帮我设置他正在寻找的所需组件的背景。

谢谢

【问题讨论】：

标签： c# wpf combobox background-color

【解决方案1】：

试试这个

 <Window.Resources>  //Put this resourse n Window.Resources or UserControl.Resources
   <LinearGradientBrush x:Key="NormalBrush" StartPoint="0,0" EndPoint="0,1">
      <GradientBrush.GradientStops>
         <GradientStopCollection>
            <GradientStop Color="#FFDC3939" Offset="0.0"/>
            <GradientStop Color="#FFE80E0E" Offset="1.0"/>
         </GradientStopCollection>
      </GradientBrush.GradientStops>
   </LinearGradientBrush>

    <SolidColorBrush x:Key="WindowBackgroundBrush" Color="#FFFBE618" />

    <ControlTemplate x:Key="ComboBoxToggleButton" TargetType="ToggleButton">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition />
                <ColumnDefinition Width="20" />
            </Grid.ColumnDefinitions>
            <Border x:Name="Border" Grid.ColumnSpan="2" CornerRadius="2"
  Background="{StaticResource NormalBrush}"
  BorderThickness="1" />
            <Border 
  Grid.Column="0"
  CornerRadius="2,0,0,2" 
  Margin="1" 
  Background="{StaticResource WindowBackgroundBrush}" 
  BorderThickness="0,0,1,0" />
            <Path 
  x:Name="Arrow"
  Grid.Column="1"     
  HorizontalAlignment="Center"
  VerticalAlignment="Center"
  Data="M 0 0 L 4 4 L 8 0 Z"/>
        </Grid>
    </ControlTemplate>

    <ControlTemplate x:Key="ComboBoxTextBox" TargetType="TextBox">
        <Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" />
    </ControlTemplate>


<Style x:Key="{x:Type ComboBox}" TargetType="ComboBox">
  <Setter Property="Template">
   <Setter.Value>
     <ControlTemplate TargetType="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" 
        Margin="3,3,23,3"
        VerticalAlignment="Center"
        HorizontalAlignment="Left" />
       <TextBox x:Name="PART_EditableTextBox"
         Style="{x:Null}" 
         Template="{StaticResource ComboBoxTextBox}" 
         HorizontalAlignment="Left" 
         VerticalAlignment="Center" 
         Margin="3,3,23,3"
         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="{StaticResource WindowBackgroundBrush}"
            BorderThickness="1"/>
           <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
            <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
           </ScrollViewer>
          </Grid>
         </Popup>
        </Grid>
       </ControlTemplate>
      </Setter.Value>
     </Setter>
    <Style.Triggers>
   </Style.Triggers>
  </Style>
 </Window.Resources>
 <Grid>
    <ComboBox HorizontalAlignment="Left" Margin="256,57,0,0" VerticalAlignment="Top" Width="120">
    </ComboBox>

 </Grid>

这是您可以更改的完整样式：http://msdn.microsoft.com/en-us/library/ms752094%28v=VS.85%29.aspx

【讨论】：

所选项目未出现在顶部。尝试了许多变化来设置前景色，但没有影响。为什么所选项目在顶部不可见？我的意思是即使在选择后组合框也显示为空白 - 而所选项目应该出现在顶部。相同的设置是什么？
@Tvd 由于 ContentPresenter 缺少某些属性，所选项目未出现：Content="{TemplateBinding ComboBox.SelectionBoxItem}" ContentTemplate="{TemplateBinding ComboBox.SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
WPF 太令人失望了……这么多代码只是为了设置 ComboBox 的背景。
谢谢@Optimax 答案应该用你的 cmets 更新！
这是一个很好的例子，说明了为什么 WPF 如此混乱（甚至是失败？）。他们应该从头开始。

【解决方案2】：

如果您在查看 xaml 时在“文档大纲”窗口中使用 VS 2012 或 VS 2013，请获取组合框的控件模板。找到样式 x:Key="ComboBoxReadonlyToggleButton" 并更新 Themes:ButtonChrome 上的 RenderMouseOver = "False" 和 RenderPressed="False" 并注释掉影响 IsEnabled 的触发器。

下面是我在我的盒子上编辑的那个来说明我的意思。

<Style x:Key="ComboBoxReadonlyToggleButton" TargetType="{x:Type ToggleButton}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="ClickMode" Value="Press"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ToggleButton}">
                    <Themes:ButtonChrome x:Name="Chrome" BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" RenderMouseOver="False" RenderPressed="False" SnapsToDevicePixels="true">
                        <Grid HorizontalAlignment="Right" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}">
                            <Path x:Name="Arrow" Data="{StaticResource DownArrowGeometry}" Fill="Black" HorizontalAlignment="Center" Margin="3,1,0,0" VerticalAlignment="Center"/>
                        </Grid>
                    </Themes:ButtonChrome>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="true">
                            <Setter Property="RenderPressed" TargetName="Chrome" Value="False"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <!--<Setter Property="Fill" TargetName="Arrow" Value="#AFAFAF"/>-->
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

【讨论】：

为此我需要添加 Aero 或任何此类组件，否则这也满足我的需要。非常感谢。

【解决方案3】：

虽然我喜欢接受的答案，但我遇到的问题是文本框演示者完全错过了，因此您可以选择和设置样式，但它们永远不会呈现给最终用户。我认为实现显示数据的组合框的最简单方法是：

<Window http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Test" x:Class="MainWindow"
        mc:Ignorable="d" Title="MainWindow" Height="100" Width="200">
  <Window.Resources>
    <Style x:Key="ComboBoxTest2" TargetType="{x:Type ComboBox}">
      <Setter Property="Template">
        <Setter.Value>
          <ControlTemplate TargetType="ComboBox">
            <Grid>
              <ToggleButton Grid.Column="2" Focusable="false" IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}" >
                <ToggleButton.Template>
                  <ControlTemplate>
                    <Grid>
                      <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="5*" />
                        <ColumnDefinition Width="*" />
                      </Grid.ColumnDefinitions>
                      <Border x:Name="Border"  Grid.ColumnSpan="2" CornerRadius="5" Background="Beige" BorderBrush="Black" BorderThickness="1" />
                      <Border Grid.Column="0" CornerRadius="5,0,0,5"  Margin="1"  Background="AliceBlue"  BorderBrush="Black" BorderThickness="0,0,1,0" />
                      <Path x:Name="Arrow" Grid.Column="1"  Fill="Orange" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z"/>
                    </Grid>
                    <ControlTemplate.Triggers>
                      <Trigger Property="ToggleButton.IsMouseOver" Value="true">
                        <Setter TargetName="Border" Property="Background" Value="Green" />
                      </Trigger>
                      <Trigger Property="ToggleButton.IsChecked" Value="true">
                        <Setter TargetName="Border" Property="Background" Value="Green" />
                      </Trigger>
                    </ControlTemplate.Triggers>
                  </ControlTemplate>
                </ToggleButton.Template>
              </ToggleButton>
              <ContentPresenter Name="ContentSite" IsHitTestVisible="False"  Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Margin="3"  />
              <TextBox x:Name="PART_EditableTextBox" 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="Blue" />
                  <ScrollViewer SnapsToDevicePixels="True">
                    <StackPanel IsItemsHost="True" />
                  </ScrollViewer>
                </Grid>
              </Popup>
            </Grid>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
      <Style.Triggers>
      </Style.Triggers>
    </Style>
  </Window.Resources>
  <StackPanel Margin="10">
    <ComboBox VerticalAlignment="Top" Width="120" Style="{StaticResource ComboBoxTest2}">
      <ComboBoxItem>Item1</ComboBoxItem>
      <ComboBoxItem>Item2</ComboBoxItem>
    </ComboBox>
  </StackPanel>
</Window>

演示中需要完成的关键部分是用于初始显示的模板“ToggleButton.Template”。我选择忽略制作更多画笔和指向更多模板的链接，而只是将其全部内联，以便其他人可以根据需要使用它。我还选择了我认为很容易识别的颜色以供参考，当它起作用时应该如下所示：

【讨论】：

【解决方案4】：

只需将以下内容添加到您的 ComboBox 样式中即可：)

BasedOn="{StaticResource {x:Type ComboBox}}"

例子：

<Style TargetType="ComboBox" BasedOn="{StaticResource {x:Type ComboBox}}">
    <Setter Property="Background" Value="Red" />
    //Other setters, triggers, etc...
</Style>

相信我，这可能是最短的方法......我不明白为什么我们必须完全重新定义 ComboBox 模板。

【讨论】：

它什么也没做
我收到此错误消息：无法解析资源“{x:Type ComboBox}”。

【解决方案5】：

在 Windows 8 或 10 上，这是正确的 WPF 方式，无需重新设计组合框并且 100% 可自定义。

只需复制粘贴并测试！ :)

Click here to see how look the ComboBox

  <Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:Test_Combo_Custom"
    xmlns:Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero2" x:Class="Test_Combo_Custom.MainWindow"
    mc:Ignorable="d"
    Title="MainWindow" Height="450" Width="800">


<Window.Resources>
    <Style x:Key="FocusVisual">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Rectangle Margin="2" SnapsToDevicePixels="true" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <SolidColorBrush x:Key="ComboBox.Static.Background" Color="Yellow"/>
    <SolidColorBrush x:Key="ComboBox.MouseOver.Background" Color="#FFFF0C00"/>
    <SolidColorBrush x:Key="ComboBox.Static.Border" Color="#FFACACAC"/>
    <SolidColorBrush x:Key="ComboBox.Static.Editable.Background" Color="#FFFB0F0F"/>
    <SolidColorBrush x:Key="ComboBox.Static.Editable.Border" Color="#FFABADB3"/>
    <SolidColorBrush x:Key="ComboBox.Static.Editable.Button.Background" Color="Transparent"/>
    <SolidColorBrush x:Key="ComboBox.Static.Editable.Button.Border" Color="Transparent"/>
    <SolidColorBrush x:Key="ComboBox.MouseOver.Glyph" Color="#FF000000"/>
    <SolidColorBrush x:Key="ComboBox.MouseOver.Border" Color="#FF7EB4EA"/>
    <SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Background" Color="#FF88E00A"/>
    <SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Border" Color="#FF7EB4EA"/>
    <SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Button.Background" Color="#FF7EB4EA"/>
    <SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Button.Border" Color="#FF7EB4EA"/>
    <SolidColorBrush x:Key="ComboBox.Pressed.Glyph" Color="#FF000000"/>
    <SolidColorBrush x:Key="ComboBox.Pressed.Background" Color="#FF000000"/>
    <SolidColorBrush x:Key="ComboBox.Pressed.Border" Color="#FF569DE5"/>
    <SolidColorBrush x:Key="ComboBox.Pressed.Editable.Background" Color="#FF00FFC5"/>
    <SolidColorBrush x:Key="ComboBox.Pressed.Editable.Border" Color="#FF569DE5"/>
    <SolidColorBrush x:Key="ComboBox.Pressed.Editable.Button.Background" Color="#FF569DE5"/>
    <SolidColorBrush x:Key="ComboBox.Pressed.Editable.Button.Border" Color="#FF569DE5"/>
    <SolidColorBrush x:Key="ComboBox.Disabled.Glyph" Color="#FFBFBFBF"/>
    <SolidColorBrush x:Key="ComboBox.Disabled.Background" Color="#FF101AEC"/>
    <SolidColorBrush x:Key="ComboBox.Disabled.Border" Color="#FFD9D9D9"/>
    <SolidColorBrush x:Key="ComboBox.Disabled.Editable.Background" Color="#FFC91355"/>
    <SolidColorBrush x:Key="ComboBox.Disabled.Editable.Border" Color="#FFBFBFBF"/>
    <SolidColorBrush x:Key="ComboBox.Disabled.Editable.Button.Background" Color="Transparent"/>
    <SolidColorBrush x:Key="ComboBox.Disabled.Editable.Button.Border" Color="Transparent"/>
    <SolidColorBrush x:Key="ComboBox.Static.Glyph" Color="#FF606060"/>


    <Style x:Key="ComboBoxToggleButton2" TargetType="{x:Type ToggleButton}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="ClickMode" Value="Press"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ToggleButton}">
                    <Border x:Name="templateRoot" BorderBrush="{StaticResource ComboBox.Static.Border}" BorderThickness="{TemplateBinding BorderThickness}" Background="{StaticResource ComboBox.Static.Background}" SnapsToDevicePixels="true">
                        <Border x:Name="splitBorder" BorderBrush="Transparent" BorderThickness="1" HorizontalAlignment="Right" Margin="0" SnapsToDevicePixels="true" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}">
                            <Path x:Name="arrow" Data="F1 M 0,0 L 2.667,2.66665 L 5.3334,0 L 5.3334,-1.78168 L 2.6667,0.88501 L0,-1.78168 L0,0 Z" Fill="{StaticResource ComboBox.Static.Glyph}" HorizontalAlignment="Center" Margin="0" VerticalAlignment="Center"/>
                        </Border>
                    </Border>
                    <ControlTemplate.Triggers>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="true"/>
                                <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="false"/>
                                <Condition Binding="{Binding IsPressed, RelativeSource={RelativeSource Self}}" Value="false"/>
                                <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="true"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Static.Editable.Background}"/>
                            <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Static.Editable.Border}"/>
                            <Setter Property="Background" TargetName="splitBorder" Value="{StaticResource ComboBox.Static.Editable.Button.Background}"/>
                            <Setter Property="BorderBrush" TargetName="splitBorder" Value="{StaticResource ComboBox.Static.Editable.Button.Border}"/>
                        </MultiDataTrigger>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter Property="Fill" TargetName="arrow" Value="{StaticResource ComboBox.MouseOver.Glyph}"/>
                        </Trigger>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="true"/>
                                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="false"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.MouseOver.Background}"/>
                            <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.MouseOver.Border}"/>
                        </MultiDataTrigger>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="true"/>
                                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="true"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.MouseOver.Editable.Background}"/>
                            <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.MouseOver.Editable.Border}"/>
                            <Setter Property="Background" TargetName="splitBorder" Value="{StaticResource ComboBox.MouseOver.Editable.Button.Background}"/>
                            <Setter Property="BorderBrush" TargetName="splitBorder" Value="{StaticResource ComboBox.MouseOver.Editable.Button.Border}"/>
                        </MultiDataTrigger>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter Property="Fill" TargetName="arrow" Value="{StaticResource ComboBox.Pressed.Glyph}"/>
                        </Trigger>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsPressed, RelativeSource={RelativeSource Self}}" Value="true"/>
                                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="false"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Pressed.Background}"/>
                            <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Pressed.Border}"/>
                        </MultiDataTrigger>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsPressed, RelativeSource={RelativeSource Self}}" Value="true"/>
                                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="true"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Pressed.Editable.Background}"/>
                            <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Pressed.Editable.Border}"/>
                            <Setter Property="Background" TargetName="splitBorder" Value="{StaticResource ComboBox.Pressed.Editable.Button.Background}"/>
                            <Setter Property="BorderBrush" TargetName="splitBorder" Value="{StaticResource ComboBox.Pressed.Editable.Button.Border}"/>
                        </MultiDataTrigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Fill" TargetName="arrow" Value="{StaticResource ComboBox.Disabled.Glyph}"/>
                        </Trigger>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="false"/>
                                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="false"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Disabled.Background}"/>
                            <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Disabled.Border}"/>
                        </MultiDataTrigger>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="false"/>
                                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}" Value="true"/>
                            </MultiDataTrigger.Conditions>
                            <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource ComboBox.Disabled.Editable.Background}"/>
                            <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource ComboBox.Disabled.Editable.Border}"/>
                            <Setter Property="Background" TargetName="splitBorder" Value="{StaticResource ComboBox.Disabled.Editable.Button.Background}"/>
                            <Setter Property="BorderBrush" TargetName="splitBorder" Value="{StaticResource ComboBox.Disabled.Editable.Button.Border}"/>
                        </MultiDataTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <ControlTemplate x:Key="ComboBoxTemplate" TargetType="{x:Type ComboBox}">
        <Grid x:Name="templateRoot" SnapsToDevicePixels="true">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/>
            </Grid.ColumnDefinitions>
            <Popup x:Name="PART_Popup" AllowsTransparency="true" Grid.ColumnSpan="2" IsOpen="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
                <Themes:SystemDropShadowChrome x:Name="shadow" Color="Transparent" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=templateRoot}">
                    <Border x:Name="dropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">
                        <ScrollViewer x:Name="DropDownScrollViewer">
                            <Grid x:Name="grid" RenderOptions.ClearTypeHint="Enabled">
                                <Canvas x:Name="canvas" HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
                                    <Rectangle x:Name="opaqueRect" Fill="{Binding Background, ElementName=dropDownBorder}" Height="{Binding ActualHeight, ElementName=dropDownBorder}" Width="{Binding ActualWidth, ElementName=dropDownBorder}"/>
                                </Canvas>
                                <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            </Grid>
                        </ScrollViewer>
                    </Border>
                </Themes:SystemDropShadowChrome>
            </Popup>
            <ToggleButton x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxToggleButton2}"/>
            <ContentPresenter x:Name="contentPresenter" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="false" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="true">
                <Setter Property="Margin" TargetName="shadow" Value="0,0,5,5"/>
                <Setter Property="Color" TargetName="shadow" Value="#71000000"/>
            </Trigger>
            <Trigger Property="HasItems" Value="false">
                <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
            </Trigger>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="IsGrouping" Value="true"/>
                    <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/>
                </MultiTrigger.Conditions>
                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
            </MultiTrigger>
            <Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false">
                <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/>
                <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
    <SolidColorBrush x:Key="TextBox.Static.Background" Color="#FFFFFFFF"/>
    <Style x:Key="ComboBoxEditableTextBox" TargetType="{x:Type TextBox}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="AllowDrop" Value="true"/>
        <Setter Property="MinWidth" Value="0"/>
        <Setter Property="MinHeight" Value="0"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TextBox}">
                    <ScrollViewer x:Name="PART_ContentHost" Background="Transparent" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <ControlTemplate x:Key="ComboBoxEditableTemplate" TargetType="{x:Type ComboBox}">
        <Grid x:Name="templateRoot" SnapsToDevicePixels="true">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/>
            </Grid.ColumnDefinitions>
            <Popup x:Name="PART_Popup" AllowsTransparency="true" Grid.ColumnSpan="2" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
                <Themes:SystemDropShadowChrome x:Name="shadow" Color="Transparent" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=templateRoot}">
                    <Border x:Name="dropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">
                        <ScrollViewer x:Name="DropDownScrollViewer">
                            <Grid x:Name="grid" RenderOptions.ClearTypeHint="Enabled">
                                <Canvas x:Name="canvas" HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
                                    <Rectangle x:Name="opaqueRect" Fill="{Binding Background, ElementName=dropDownBorder}" Height="{Binding ActualHeight, ElementName=dropDownBorder}" Width="{Binding ActualWidth, ElementName=dropDownBorder}"/>
                                </Canvas>
                                <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            </Grid>
                        </ScrollViewer>
                    </Border>
                </Themes:SystemDropShadowChrome>
            </Popup>
            <ToggleButton x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxToggleButton2}"/>
            <Border x:Name="border" Background="{StaticResource TextBox.Static.Background}" Margin="{TemplateBinding BorderThickness}">
                <TextBox x:Name="PART_EditableTextBox" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" Margin="{TemplateBinding Padding}" Style="{StaticResource ComboBoxEditableTextBox}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
            </Border>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Opacity" TargetName="border" Value="0.56"/>
            </Trigger>
            <Trigger Property="IsKeyboardFocusWithin" Value="true">
                <Setter Property="Foreground" Value="Black"/>
            </Trigger>
            <Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="true">
                <Setter Property="Margin" TargetName="shadow" Value="0,0,5,5"/>
                <Setter Property="Color" TargetName="shadow" Value="#71000000"/>
            </Trigger>
            <Trigger Property="HasItems" Value="false">
                <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
            </Trigger>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="IsGrouping" Value="true"/>
                    <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/>
                </MultiTrigger.Conditions>
                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
            </MultiTrigger>
            <Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false">
                <Setter Property="Canvas.Top" TargetName="opaqueRect" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}"/>
                <Setter Property="Canvas.Left" TargetName="opaqueRect" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
    <Style x:Key="ComboBoxStyleCustom" TargetType="{x:Type ComboBox}">
        <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/>
        <Setter Property="Background" Value="{StaticResource ComboBox.Static.Background}"/>
        <Setter Property="BorderBrush" Value="{StaticResource ComboBox.Static.Border}"/>
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
        <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
        <Setter Property="Padding" Value="6,3,5,3"/>
        <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
        <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
        <Setter Property="Template" Value="{StaticResource ComboBoxTemplate}"/>
        <Style.Triggers>
            <Trigger Property="IsEditable" Value="true">
                <Setter Property="IsTabStop" Value="false"/>
                <Setter Property="Padding" Value="2"/>
                <Setter Property="Template" Value="{StaticResource ComboBoxEditableTemplate}"/>
            </Trigger>
        </Style.Triggers>
    </Style>
</Window.Resources>


<Grid>
    <ComboBox HorizontalAlignment="Left" Margin="317.429,194.428,0,0" VerticalAlignment="Top" Width="120" Style="{DynamicResource ComboBoxStyleCustom}">
        <ComboBox.Resources>
            <!-- color of ComboBoxItem -->
            <SolidColorBrush x:Key="{x:Static SystemColors.WindowBrushKey}" Color="#FF17FF00" />
        </ComboBox.Resources>
        <ComboBoxItem>One</ComboBoxItem>
        <ComboBoxItem>Two</ComboBoxItem>
        <ComboBoxItem>Three</ComboBoxItem>
    </ComboBox> 

</Grid>
</Window>

【讨论】：

这是什么“不重新设计ComboBox”

【解决方案6】：

可以将 TextBlock 放在组合框上，但 TextBlock 应该比 ComboBox 小，这样下拉按钮才不会被隐藏。在 TextBlock 中，可以轻松设置所需的背景颜色。当 ComboBox 中的选定项发生变化时，文本块必须更新。

XAML 代码：

<ComboBox x:Name="TestComboBox" HorizontalAlignment="Left" VerticalAlignment="Top" Width="145" 
          Margin="35, 5, 0, 0" SelectionChanged="TestComboBox_SelectionChanged"/>
<TextBlock x:Name="TestTextBlock" Text="" HorizontalAlignment="Left" VerticalAlignment="Top" 
           Margin="36, 6, 0, 0" Padding="4,1" Width="126" Height="20">
  <TextBlock.Background>
    <SolidColorBrush Color="Yellow"/>
  </TextBlock.Background>
</TextBlock>

C#代码：

private void TestComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
  ComboBoxItem cbi = (ComboBoxItem)TestComboBox.SelectedItem;
  if (cbi != null)
  {
    TestTextBlock.Text = cbi.Content.ToString();
  }
  else TestTextBlock.Text = "";
}

【讨论】：