制作带有圆角的WPF组合框

<ComboBox Width="200" Height="30" CornerRadius="10" />

<ComboBox Width="200" Height="30" CornerRadius="10">
    <ComboBox.Style>
        <Style TargetType="ComboBox">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ComboBox">
                        <Border Background="{TemplateBinding Background}"
                                BorderBrush="{TemplateBinding BorderBrush}"
                                BorderThickness="{TemplateBinding BorderThickness}"
                                CornerRadius="{TemplateBinding CornerRadius}">
                            <ContentPresenter />
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </ComboBox.Style>
</ComboBox>