WPF Expander控件简单样式

<Style x:Key="ExpanderStyle1" TargetType="{x:Type Expander}">
            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="BorderBrush" Value="#918C8C"/>
            <Setter Property="BorderThickness" Value="0 0 0 0"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Expander}">
                        <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="0" SnapsToDevicePixels="True">
                            <DockPanel>
                                <ToggleButton x:Name="HeaderSite" ContentTemplate="{TemplateBinding HeaderTemplate}"
                                             Content="{TemplateBinding Header}" DockPanel.Dock="Top" Foreground="{TemplateBinding Foreground}"
                                             FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}"
                                             FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}"
                                             FontFamily="{TemplateBinding FontFamily}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                                             IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                             Margin="1" MinWidth="0" MinHeight="0" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding 
                                   VerticalContentAlignment}">
                                    <ToggleButton.FocusVisualStyle>
                                        <Style>
                                            <Setter Property="Control.Template">
                                                <Setter.Value>
                                                    <ControlTemplate>
                                                        <Border>
                                                            <Rectangle Margin="0" SnapsToDevicePixels="True" Stroke="Black" StrokeThickness="1" StrokeDashArray="1 2"/>
                                                        </Border>
                                                    </ControlTemplate>
                                                </Setter.Value>
                                            </Setter>
                                        </Style>
                                    </ToggleButton.FocusVisualStyle>
                                    <ToggleButton.Style>
                                        <Style TargetType="{x:Type ToggleButton}">
                                            <Setter Property="Template">
                                                <Setter.Value>
                                                    <ControlTemplate TargetType="{x:Type ToggleButton}">
                                                        <Border Padding="{TemplateBinding Padding}">
                                                            <Grid>
                                                                <Grid.ColumnDefinitions>
                                                                    <ColumnDefinition Width="19*"/>

                                                                </Grid.ColumnDefinitions>
                                                                <Path Grid.Column="0" x:Name="arrow" Data="M1,1.5L4.5,5 8,1.5" HorizontalAlignment="Right"  SnapsToDevicePixels="False" Stroke="#918C8C" StrokeThickness="2" VerticalAlignment="Center" Height="10" Margin="0,10" />

                                                                <ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="Left" Margin="4,0,0,0" RecognizesAccessKey="True" SnapsToDevicePixels="True" VerticalAlignment="Center"  />
                                                            </Grid>
                                                        </Border>
                                                        <ControlTemplate.Triggers>
                                                            <Trigger Property="IsChecked" Value="True">
                                                                <Setter Property="Data" TargetName="arrow" Value="M1,4.5L4.5,1 8,4.5"/>
                                                            </Trigger>
                                                            <Trigger Property="IsMouseOver" Value="True">

                                                                <Setter Property="Stroke" TargetName="arrow" Value="Black"/>
                                                            </Trigger>
                                                            <Trigger Property="IsPressed" Value="True">
                                                                <Setter Property="Stroke" TargetName="arrow" Value="Black"/>
                                                            </Trigger>
                                                            <Trigger Property="IsEnabled" Value="False">
                                                                <Setter Property="Stroke" TargetName="arrow" Value="#FF707070"/>
                                                            </Trigger>
                                                        </ControlTemplate.Triggers>
                                                    </ControlTemplate>
                                                </Setter.Value>
                                            </Setter>
                                        </Style>
                                    </ToggleButton.Style>
                                </ToggleButton>
                                <ContentPresenter x:Name="ExpandSite" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" DockPanel.Dock="Bottom" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" Visibility="Collapsed" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            </DockPanel>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsExpanded" Value="True">

                                <Setter Property="Visibility" TargetName="ExpandSite" Value="Visible"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

使用方式：

<Grid>
        <Expander Width="200" ExpandDirection="Down"  SnapsToDevicePixels="True" VerticalAlignment="Top" Style="{DynamicResource ExpanderStyle1}">
            <Expander.Header>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="hello" 
                                    FontSize="22" Foreground="#918C8C" VerticalAlignment="Center"></TextBlock>
                    <TextBlock FontSize="25" Text="首页" Margin="8,0,-51,0"  Foreground="#918C8C" ></TextBlock>
                </StackPanel>
            </Expander.Header>
            <Expander.Content>
                <StackPanel Background="#F6F8F8">
                    <RadioButton >控制中心</RadioButton>
                    <RadioButton >资源管理</RadioButton>
                    <RadioButton >仪表菜单</RadioButton>
                    <RadioButton >顶部导航</RadioButton>
                    <RadioButton >通知中心</RadioButton>
                    <RadioButton >蓝牙设置</RadioButton>
                </StackPanel>
            </Expander.Content>
        </Expander>
    </Grid>