wpf Button 背景放图片去掉鼠标移上去的白色背景

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 <Style TargetType="{x:Type Button}">
                     <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border Background="{TemplateBinding Background}" BorderBrush="Transparent" BorderThickness="0">
                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>