用WPF写一个自定义样式的expander控件把按钮圆圈删除

非常感谢您的提问！以下是用WPF写一个自定义样式的expander控件把按钮圆圈删除的代码：

<Style TargetType="{x:Type Expander}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Expander}">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="*"/>
                    </Grid.RowDefinitions>
                    <Border Grid.Row="0" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="33"/>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <ToggleButton Grid.Column="0" IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}">
                                <Path x:Name="ExpandPath" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z" Fill="{TemplateBinding Foreground}" />
                            </ToggleButton>
                            <ContentPresenter Grid.Column="1" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" ContentSource="Header"/>
                        </Grid>
                    </Border>
                    <Border Grid.Row="1" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
                        <ContentPresenter Margin="{TemplateBinding Padding}" Visibility="{TemplateBinding IsExpanded, Converter={StaticResource BooleanToVisibilityConverter}}" />
                    </Border>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

希望这个代码可以帮助到您！