Styles/ComboBox.xaml

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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:WPFDemo"
                    xmlns:controls="clr-namespace:WPFDemo.Controls">
    <!--ComboBox-->
    <!--ComBoBox项选中背景色-->
    <SolidColorBrush x:Key="ComboBoxSelectdBackground" Color="#ff8c69"/>
    <!--ComBoBox项鼠标经过背景色-->
    <SolidColorBrush x:Key="ComboBoxMouseOverBackground" Color="#ff3030"/>
    <!--ComBoBox项选中前景色-->
    <SolidColorBrush x:Key="ComboBoxSelectedForeground" Color="White"/>
    <!--ComBoBox项鼠标经过前景色-->
    <SolidColorBrush x:Key="ComboBoxMouseOverForegrond" Color="White"/>

    <ControlTemplate x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}">
        <Grid Height="25" HorizontalAlignment="Stretch">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="30"/>
            </Grid.ColumnDefinitions>
            <Border  Background="White" Grid.ColumnSpan="2" Opacity="0"/>
            <Path x:Name="Arrow" Grid.Column="1"   Data="M 0 0  6 6 12 0 Z" VerticalAlignment="Center" HorizontalAlignment="Center" Stretch="None" Fill="#999" />
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="IsChecked" Value="true">
                <Setter TargetName="Arrow" Property="RenderTransform">
                    <Setter.Value>
                        <RotateTransform   CenterX="6" CenterY="3" Angle="180"></RotateTransform>
                    </Setter.Value>
                </Setter>
                <Setter TargetName="Arrow" Property="Margin" Value="0 0 0 2"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <Style TargetType="{x:Type ComboBox}">
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style TargetType="ComboBoxItem">
                    <Setter Property="Height" Value="20"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate  TargetType="{x:Type ComboBoxItem}">
                                <Grid Height="{TemplateBinding Height}" Width="{TemplateBinding Width}">
                                    <Border x:Name="_borderbg" Background="Transparent"/>
                                    <TextBlock Margin="3 0 3 0" VerticalAlignment="Center" x:Name="_txt" Foreground="#333" Text="{Binding Content,RelativeSource={RelativeSource TemplatedParent}}"/>
                                    <Border x:Name="_border" Background="White" Opacity="0"/>
                                </Grid>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsSelected" Value="true">
                                        <Setter TargetName="_borderbg" Property="Background" Value="{StaticResource ComboBoxSelectdBackground}" />
                                        <Setter TargetName="_txt" Property="Foreground" Value="{StaticResource ComboBoxSelectedForeground}"/>
                                    </Trigger>
                                    <MultiTrigger>
                                        <MultiTrigger.Conditions>
                                            <Condition Property="IsSelected" Value="false"/>
                                            <Condition Property="IsMouseOver" Value="true"/>
                                        </MultiTrigger.Conditions>
                                        <Setter TargetName="_borderbg" Property="Background" Value="{StaticResource ComboBoxMouseOverBackground}" />
                                        <Setter TargetName="_txt" Property="Foreground" Value="{StaticResource ComboBoxMouseOverForegrond}"/>