WPF按钮对齐异常：背景与边框偏移问题求助

你的按钮出现背景偏移的核心原因是自定义ControlTemplate中的Border未设置拉伸对齐，导致Border没有填满按钮的整个尺寸范围，仅包裹了ContentPresenter区域，看起来像是存在内边距。

修复方案 #

修改按钮样式中的ControlTemplate部分，给Border添加HorizontalAlignment="Stretch"和VerticalAlignment="Stretch"属性，让Border自动填满按钮的可用空间：

<Style x:Key="BtnPrincipal" TargetType="Button">
    <Setter Property="Background" Value="{StaticResource AzulAquaOscuro}" />
    <Setter Property="BorderThickness" Value="0" />
    <Setter Property="Height" Value="40" />
    <Setter Property="Foreground" Value="White" />
    <Setter Property="Width" Value="200" />
    <Setter Property="Padding" Value="0" />
    <Setter Property="Margin" Value="5" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <!-- 添加Stretch对齐，让Border填满按钮空间 -->
                <Border Background="{TemplateBinding Background}"
                        HorizontalAlignment="Stretch"
                        VerticalAlignment="Stretch">
                    <ContentPresenter HorizontalAlignment="Center"
                                      VerticalAlignment="Center" />
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Background" Value="{StaticResource AzulAquaClaro}" />
        </Trigger>
        <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Background" Value="{StaticResource GrisClaro}" />
            <Setter Property="Cursor" Value="No" />
        </Trigger>
    </Style.Triggers>
</Style>

额外说明 #

如果后续需要给按钮添加边框，记得给Border绑定BorderThickness="{TemplateBinding BorderThickness}"和BorderBrush="{TemplateBinding BorderBrush}"，保证样式属性能正确传递到模板内的Border元素。

内容的提问来源于stack exchange，提问作者Javier Maldonado