如何设置 WPF 组合框的样式以使其看起来更像以前的版本
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【中文标题】如何设置 WPF 组合框的样式以使其看起来更像以前的版本【英文标题】：How can I style a WPF combobox to make it look more like it did in previous versions 【发布时间】：2018-08-24 18:18:03 【问题描述】：我的目标是在 WPF 中设置组合框的样式，使其看起来像旧版本的组合框。我的意思是旧的组合框在右端有一个明显的白色文本框和一个灰色的切换按钮。请参阅下面的图片 New and old comboboxes
我希望组合框的某些属性（例如“切换按钮背景”）可以简单地更改，但似乎并非如此。我想知道下面的代码是否是正确的起点。
<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 ComboBoxToggleButton"/>
<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"/>
根据我在搜索该网站上的帖子时收集到的信息，我的出发点是编辑默认组合框的控件模板。这提供了大约 300 行代码来定义控件的样式，在我看来并不容易理解。
这篇WPF Change Background color of a Combobox 的帖子有一些代码，其样式类似于我想要的组合框，但我希望有人能解释这个过程而不仅仅是发布代码，因为我将对各种控件进行许多小调整。
如果我在正确的轨道上以及从这里去哪里，谁能告诉我？此外，一旦我有一些工作，重用这种新模板样式以便它可以在其他应用程序中使用的最佳方法是什么？感谢您的帮助！
@zack raiyan 我基本上尝试将代码中的两个模板粘贴到代码中已经存在的切换按钮和控制框模板上。这给了我一个无效标记的错误。你看到我做错了什么吗？代码如下
<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:WpfApplication15"
xmlns:Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero2" x:Class="WpfApplication15.MainWindow"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<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>
<LinearGradientBrush x:Key="ComboBox.Static.Background" EndPoint="0,1" StartPoint="0,0">
<GradientStop Color="#FFF0F0F0" Offset="0.0"/>
<GradientStop Color="#FFE5E5E5" Offset="1.0"/>
</LinearGradientBrush>
<SolidColorBrush x:Key="ComboBox.Static.Border" Color="#FFACACAC"/>
<SolidColorBrush x:Key="ComboBox.Static.Editable.Background" Color="#FFFFFFFF"/>
<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"/>
<LinearGradientBrush x:Key="ComboBox.MouseOver.Background" EndPoint="0,1" StartPoint="0,0">
<GradientStop Color="#FFECF4FC" Offset="0.0"/>
<GradientStop Color="#FFDCECFC" Offset="1.0"/>
</LinearGradientBrush>
<SolidColorBrush x:Key="ComboBox.MouseOver.Border" Color="#FF7EB4EA"/>
<SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Background" Color="#FFFFFFFF"/>
<SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Border" Color="#FF7EB4EA"/>
<LinearGradientBrush x:Key="ComboBox.MouseOver.Editable.Button.Background" EndPoint="0,1" StartPoint="0,0">
<GradientStop Color="#FFEBF4FC" Offset="0.0"/>
<GradientStop Color="#FFDCECFC" Offset="1.0"/>
</LinearGradientBrush>
<SolidColorBrush x:Key="ComboBox.MouseOver.Editable.Button.Border" Color="#FF7EB4EA"/>
<SolidColorBrush x:Key="ComboBox.Pressed.Glyph" Color="#FF000000"/>
<LinearGradientBrush x:Key="ComboBox.Pressed.Background" EndPoint="0,1" StartPoint="0,0">
<GradientStop Color="#FFDAECFC" Offset="0.0"/>
<GradientStop Color="#FFC4E0FC" Offset="1.0"/>
</LinearGradientBrush>
<SolidColorBrush x:Key="ComboBox.Pressed.Border" Color="#FF569DE5"/>
<SolidColorBrush x:Key="ComboBox.Pressed.Editable.Background" Color="#FFFFFFFF"/>
<SolidColorBrush x:Key="ComboBox.Pressed.Editable.Border" Color="#FF569DE5"/>
<LinearGradientBrush x:Key="ComboBox.Pressed.Editable.Button.Background" EndPoint="0,1" StartPoint="0,0">
<GradientStop Color="#FFDAEBFC" Offset="0.0"/>
<GradientStop Color="#FFC4E0FC" Offset="1.0"/>
</LinearGradientBrush>
<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="#FFF0F0F0"/>
<SolidColorBrush x:Key="ComboBox.Disabled.Border" Color="#FFD9D9D9"/>
<SolidColorBrush x:Key="ComboBox.Disabled.Editable.Background" Color="#FFFFFFFF"/>
<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"/>
<SolidColorBrush x:Key="ComboBoxNormalBorderBrush" Color="#e3e9ef" />
<SolidColorBrush x:Key="ComboBoxNormalBackgroundBrush" Color="#fff" />
<SolidColorBrush x:Key="ComboBoxDisabledForegroundBrush" Color="#888" />
<SolidColorBrush x:Key="ComboBoxDisabledBackgroundBrush" Color="#eee" />
<SolidColorBrush x:Key="ComboBoxDisabledBorderBrush" Color="#888" />
<Style x:Key="ComboBoxToggleButton" 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="ToggleButton" x:Key="ComboBoxToggleButtonTemplate">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<Border Grid.ColumnSpan="2" Name="Border"
BorderBrush="StaticResource ComboBoxNormalBorderBrush"
CornerRadius="0" BorderThickness="1, 1, 1, 1"
Background="StaticResource ComboBoxNormalBackgroundBrush" />
<Border Grid.Column="1" Margin="1, 1, 1, 1" BorderBrush="#444" Name="ButtonBorder"
CornerRadius="0, 0, 0, 0" BorderThickness="0, 0, 0, 0"
Background="StaticResource ComboBoxNormalBackgroundBrush" />
<Path Name="Arrow" Grid.Column="1"
Data="M0,0 L0,2 L4,6 L8,2 L8,0 L4,4 z"
HorizontalAlignment="Center" Fill="#444"
VerticalAlignment="Center" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="UIElement.IsMouseOver" Value="True">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="WhiteSmoke"/>
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="WhiteSmoke"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#FF8D979E"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="Panel.Background" TargetName="Border" Value="StaticResource ComboBoxDisabledBackgroundBrush"/>
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="StaticResource ComboBoxDisabledBackgroundBrush"/>
<Setter Property="Border.BorderBrush" TargetName="ButtonBorder" Value="StaticResource ComboBoxDisabledBorderBrush"/>
<Setter Property="TextElement.Foreground" Value="StaticResource ComboBoxDisabledForegroundBrush"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#999"/>
</Trigger>
</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 ComboBoxToggleButton"/>
<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 ComboBoxToggleButton"/>
<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="ComboBoxFlatStyle" TargetType="x:Type ComboBox">
<Setter Property="UIElement.SnapsToDevicePixels" Value="True"/>
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="True"/>
<Setter Property="TextElement.Foreground" Value="Black"/>
<Setter Property="FrameworkElement.FocusVisualStyle" Value="x:Null"/>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Name="ToggleButton" Grid.Column="2"
ClickMode="Press" Focusable="False"
IsChecked="Binding Path=IsDropDownOpen, RelativeSource=RelativeSource TemplatedParent, Mode=TwoWay"
Template="StaticResource ComboBoxToggleButtonTemplate"/>
<ContentPresenter Name="ContentSite" Margin="5, 3, 23, 3" IsHitTestVisible="False"
HorizontalAlignment="Left" VerticalAlignment="Center"
Content="TemplateBinding ComboBox.SelectionBoxItem"
ContentTemplate="TemplateBinding ComboBox.SelectionBoxItemTemplate"
ContentTemplateSelector="TemplateBinding ItemTemplateSelector"/>
<TextBox Name="PART_EditableTextBox" Margin="3, 3, 23, 3"
IsReadOnly="TemplateBinding IsReadOnly"
Visibility="Hidden" Background="Transparent"
HorizontalAlignment="Left" VerticalAlignment="Center"
Focusable="True" >
<TextBox.Template>
<ControlTemplate TargetType="TextBox" >
<Border Name="PART_ContentHost" Focusable="False" />
</ControlTemplate>
</TextBox.Template>
</TextBox>
<!-- Popup showing items -->
<Popup Name="Popup" Placement="Bottom"
Focusable="False" AllowsTransparency="True"
IsOpen="TemplateBinding ComboBox.IsDropDownOpen"
PopupAnimation="Slide">
<Grid Name="DropDown" SnapsToDevicePixels="True"
MinWidth="TemplateBinding FrameworkElement.ActualWidth"
MaxHeight="TemplateBinding ComboBox.MaxDropDownHeight">
<Border Name="DropDownBorder" Background="White" Margin="0, 1, 0, 0"
CornerRadius="0" BorderThickness="1,1,1,1"
BorderBrush="StaticResource ComboBoxNormalBorderBrush"/>
<ScrollViewer Margin="4" SnapsToDevicePixels="True">
<ItemsPresenter KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ItemsControl.HasItems" Value="False">
<Setter Property="FrameworkElement.MinHeight" TargetName="DropDownBorder" Value="95"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" Value="StaticResource ComboBoxDisabledForegroundBrush"/>
</Trigger>
<Trigger Property="ItemsControl.IsGrouping" Value="True">
<Setter Property="ScrollViewer.CanContentScroll" Value="False"/>
</Trigger>
<Trigger Property="ComboBox.IsEditable" Value="True">
<Setter Property="KeyboardNavigation.IsTabStop" Value="False"/>
<Setter Property="UIElement.Visibility" TargetName="PART_EditableTextBox" Value="Visible"/>
<Setter Property="UIElement.Visibility" TargetName="ContentSite" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<ComboBox x:Name="comboBox" HorizontalAlignment="Left" Margin="196,65,0,0" VerticalAlignment="Top" Width="120" Style="DynamicResource ComboBoxStyleFlatWhite"/>
</Grid>
</Window>
【问题讨论】：
明确使用经典的 Windows 主题不是更简单吗？ 身份证。我不知道该怎么做 例如wpftuts.wordpress.com/2009/10/03/… 啊！这正是我一直在努力做的！谢谢！ 【参考方案1】：一个更好的：
必需属性
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"
Window.Resources 中的 ComboBox ControlTemplate
<SolidColorBrush x:Key="ComboBoxNormalBorderBrush" Color="#e3e9ef" />
<SolidColorBrush x:Key="ComboBoxNormalBackgroundBrush" Color="#fff" />
<SolidColorBrush x:Key="ComboBoxDisabledForegroundBrush" Color="#888" />
<SolidColorBrush x:Key="ComboBoxDisabledBackgroundBrush" Color="#eee" />
<SolidColorBrush x:Key="ComboBoxDisabledBorderBrush" Color="#888" />
<ControlTemplate TargetType="ToggleButton" x:Key="ComboBoxToggleButtonTemplate">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="20" />
</Grid.ColumnDefinitions>
<Border Grid.ColumnSpan="2" Name="Border"
BorderBrush="StaticResource ComboBoxNormalBorderBrush"
CornerRadius="0" BorderThickness="1, 1, 1, 1"
Background="StaticResource ComboBoxNormalBackgroundBrush" />
<Border Grid.Column="1" Margin="1, 1, 1, 1" BorderBrush="#444" Name="ButtonBorder"
CornerRadius="0, 0, 0, 0" BorderThickness="0, 0, 0, 0"
Background="StaticResource ComboBoxNormalBackgroundBrush" />
<Path Name="Arrow" Grid.Column="1"
Data="M0,0 L0,2 L4,6 L8,2 L8,0 L4,4 z"
HorizontalAlignment="Center" Fill="#444"
VerticalAlignment="Center" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="UIElement.IsMouseOver" Value="True">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="WhiteSmoke"/>
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="WhiteSmoke"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#FF8D979E"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="Panel.Background" TargetName="Border" Value="StaticResource ComboBoxDisabledBackgroundBrush"/>
<Setter Property="Panel.Background" TargetName="ButtonBorder" Value="StaticResource ComboBoxDisabledBackgroundBrush"/>
<Setter Property="Border.BorderBrush" TargetName="ButtonBorder" Value="StaticResource ComboBoxDisabledBorderBrush"/>
<Setter Property="TextElement.Foreground" Value="StaticResource ComboBoxDisabledForegroundBrush"/>
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#999"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<Style x:Key="ComboBoxFlatStyle" TargetType="x:Type ComboBox">
<Setter Property="UIElement.SnapsToDevicePixels" Value="True"/>
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="True"/>
<Setter Property="TextElement.Foreground" Value="Black"/>
<Setter Property="FrameworkElement.FocusVisualStyle" Value="x:Null"/>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBox">
<Grid>
<ToggleButton Name="ToggleButton" Grid.Column="2"
ClickMode="Press" Focusable="False"
IsChecked="Binding Path=IsDropDownOpen, RelativeSource=RelativeSource TemplatedParent, Mode=TwoWay"
Template="StaticResource ComboBoxToggleButtonTemplate"/>
<ContentPresenter Name="ContentSite" Margin="5, 3, 23, 3" IsHitTestVisible="False"
HorizontalAlignment="Left" VerticalAlignment="Center"
Content="TemplateBinding ComboBox.SelectionBoxItem"
ContentTemplate="TemplateBinding ComboBox.SelectionBoxItemTemplate"
ContentTemplateSelector="TemplateBinding ItemTemplateSelector"/>
<TextBox Name="PART_EditableTextBox" Margin="3, 3, 23, 3"
IsReadOnly="TemplateBinding IsReadOnly"
Visibility="Hidden" Background="Transparent"
HorizontalAlignment="Left" VerticalAlignment="Center"
Focusable="True" >
<TextBox.Template>
<ControlTemplate TargetType="TextBox" >
<Border Name="PART_ContentHost" Focusable="False" />
</ControlTemplate>
</TextBox.Template>
</TextBox>
<!-- Popup showing items -->
<Popup Name="Popup" Placement="Bottom"
Focusable="False" AllowsTransparency="True"
IsOpen="TemplateBinding ComboBox.IsDropDownOpen"
PopupAnimation="Slide">
<Grid Name="DropDown" SnapsToDevicePixels="True"
MinWidth="TemplateBinding FrameworkElement.ActualWidth"
MaxHeight="TemplateBinding ComboBox.MaxDropDownHeight">
<Border Name="DropDownBorder" Background="White" Margin="0, 1, 0, 0"
CornerRadius="0" BorderThickness="1,1,1,1"
BorderBrush="StaticResource ComboBoxNormalBorderBrush"/>
<ScrollViewer Margin="4" SnapsToDevicePixels="True">
<ItemsPresenter KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="ItemsControl.HasItems" Value="False">
<Setter Property="FrameworkElement.MinHeight" TargetName="DropDownBorder" Value="95"/>
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" Value="StaticResource ComboBoxDisabledForegroundBrush"/>
</Trigger>
<Trigger Property="ItemsControl.IsGrouping" Value="True">
<Setter Property="ScrollViewer.CanContentScroll" Value="False"/>
</Trigger>
<Trigger Property="ComboBox.IsEditable" Value="True">
<Setter Property="KeyboardNavigation.IsTabStop" Value="False"/>
<Setter Property="UIElement.Visibility" TargetName="PART_EditableTextBox" Value="Visible"/>
<Setter Property="UIElement.Visibility" TargetName="ContentSite" Value="Hidden"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
例子：
<ComboBox HorizontalAlignment="Left" Margin="150,85,0,0" VerticalAlignment="Top" Width="120" Style="DynamicResource ComboBoxFlatStyle"/>
【讨论】：
将其粘贴到我的 xaml 代码中进行测试会给我错误 - “无法将 'style' 类型的值添加到 'uielementcollection' 类型的集合或字典中”。我是否需要将其放在其他地方，例如在控件模板的副本中？ 我更多的是谈论如何实现代码而不是实际的组合框，但我能够让它工作。感谢您的帮助！以上是关于如何设置 WPF 组合框的样式以使其看起来更像以前的版本的主要内容，如果未能解决你的问题，请参考以下文章