修改ComboBox的Template, 在VS 2010或者Blend中你可以导出ComboBox的默认模板:
VS2010中:
然后修改里面的模板,比如:
<Window x:Class="WpfApplication3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" xmlns:my="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero">
<Window.Resources>
<ControlTemplate x:Key="Template1" TargetType="ComboBox">
<Grid Name="MainGrid" SnapsToDevicePixels="True">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0" />
</Grid.ColumnDefinitions>
<Popup AllowsTransparency="True" Grid.ColumnSpan="2" IsOpen="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" Name="PART_Popup" Placement="Bottom" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}">
<!--设置下拉列表样式-->
<my:SystemDropShadowChrome Color="Transparent" MaxHeight="{TemplateBinding ComboBox.MaxDropDownHeight}" MinWidth="{Binding Path=ActualWidth, ElementName=MainGrid}" Name="Shdw">
<Border Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" BorderThickness="1" Name="DropDownBorder"
CornerRadius="10" BorderBrush="Blue"> <!-- Here -->
<ScrollViewer Name="DropDownScrollViewer" Margin="5"><!-- Here -->
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas Height="0" HorizontalAlignment="Left" VerticalAlignment="Top" Width="0">
<Rectangle Fill="{Binding Path=Background, ElementName=DropDownBorder}" Height="{Binding Path=ActualHeight, ElementName=DropDownBorder}" Name="OpaqueRect" Width="{Binding Path=ActualWidth, ElementName=DropDownBorder}" />
</Canvas>
<ItemsPresenter KeyboardNavigation.DirectionalNavigation="Contained" Name="ItemsPresenter" SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
</Grid>
</ScrollViewer>
</Border>
</my:SystemDropShadowChrome>
</Popup>
<ToggleButton Background="{TemplateBinding Control.Background}" BorderBrush="{TemplateBinding Control.BorderBrush}" Grid.ColumnSpan="2" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}">
<ToggleButton.Style>
<Style TargetType="ToggleButton">
<Setter Property="FrameworkElement.OverridesDefaultStyle" Value="True" />
<Setter Property="Control.IsTabStop" Value="False" />
<Setter Property="UIElement.Focusable" Value="False" />
<Setter Property="ButtonBase.ClickMode" Value="Press" />
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<my:ButtonChrome Background="{TemplateBinding Control.Background}" BorderBrush="{TemplateBinding Control.BorderBrush}" Name="Chrome" RenderMouseOver="{TemplateBinding UIElement.IsMouseOver}" RenderPressed="{TemplateBinding ButtonBase.IsPressed}" SnapsToDevicePixels="True">
<!--设置下拉三角箭头样式-->
<Grid HorizontalAlignment="Right" Background="#7e94a9" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}">
<!--画出下拉箭头-->
<Path Data="M0,0L3.5,4 7,0z" Fill="Black" HorizontalAlignment="Center" Margin="3,1,0,0" Name="Arrow" VerticalAlignment="Center" />
</Grid>
</my:ButtonChrome>
<ControlTemplate.Triggers>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter Property="my:ButtonChrome.RenderPressed" TargetName="Chrome" Value="True" />
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<!--设置下拉箭头禁用时背景色-->
<Setter Property="Shape.Fill" TargetName="Arrow" Value="#FFAFAFAF" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ToggleButton.Style>
</ToggleButton>
<ContentPresenter Content="{TemplateBinding ComboBox.SelectionBoxItem}" ContentStringFormat="{TemplateBinding ComboBox.SelectionBoxItemStringFormat}" ContentTemplate="{TemplateBinding ComboBox.SelectionBoxItemTemplate}" HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}" IsHitTestVisible="False" Margin="{TemplateBinding Control.Padding}" SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding Control.VerticalContentAlignment}" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="Popup.HasDropShadow" SourceName="PART_Popup" Value="True">
<Setter Property="FrameworkElement.Margin" TargetName="Shdw" Value="0,0,5,5" />
<Setter Property="my:SystemDropShadowChrome.Color" TargetName="Shdw" Value="#71000000" />
</Trigger>
<Trigger Property="ItemsControl.HasItems" Value="False">
<Setter Property="FrameworkElement.Height" TargetName="DropDownBorder" Value="95" />
</Trigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="Control.Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
<Setter Property="Control.Background" Value="#FFF4F4F4" />
</Trigger>
<Trigger Property="ItemsControl.IsGrouping" Value="True">
<Setter Property="ScrollViewer.CanContentScroll" Value="False" />
</Trigger>
<Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="False">
<Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="{Binding Path=VerticalOffset, ElementName=DropDownScrollViewer}" />
<Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="{Binding Path=HorizontalOffset, ElementName=DropDownScrollViewer}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Window.Resources>
</Window>
使用方法,设置combobox的Template为 Temlate1
<ComboBox Height="23" HorizontalAlignment="Left" Name="comboBox1" VerticalAlignment="Top" Width="120" Template="{StaticResource Template1}" />
如果想全局的设置
则讲上述的 ControlTemplate
复制到app.xml中,外围节点为 <Style TargetType="ComboBox">
<Setter Property="Template">
<Setter.Value>
<Setter Property="Template">
<Setter.Value>
上述模板内容
</Setter.Value>
</Setter>
</Style>
app.xml头部不要忘记这个
</Setter>
</Style>
app.xml头部不要忘记这个
xmlns:my="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Luna"