如何移除WPF中ListView右下角的方形控件？

你说的方形控件大概率是ListView默认模板里的滚动条角落填充块，或是选中项的高亮边框，直接修改模板就能解决，以下是具体方案：

方案一：移除滚动条角落填充块 #

如果是滚动条交汇的空白方块，修改ListView的ControlTemplate，去掉默认的角落填充元素：

<ListView>
    <ListView.Template>
        <ControlTemplate TargetType="ListView">
            <Border Background="Transparent" BorderThickness="0">
                <ScrollViewer x:Name="ScrollViewer" 
                              Padding="{TemplateBinding Padding}"
                              Background="Transparent"
                              HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
                              VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
                              CanContentScroll="{TemplateBinding ScrollViewer.CanContentScroll}">
                    <ItemsPresenter />
                </ScrollViewer>
            </Border>
        </ControlTemplate>
    </ListView.Template>
</ListView>

方案二：透明选中项/焦点边框 #

如果是选中项的方形高亮框，修改ListViewItem模板，把选中、焦点状态的背景和边框设为完全透明：

<ListView>
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListViewItem">
                        <Border x:Name="Bd" 
                                Background="{TemplateBinding Background}"
                                BorderBrush="{TemplateBinding BorderBrush}"
                                BorderThickness="{TemplateBinding BorderThickness}"
                                Padding="{TemplateBinding Padding}">
                            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                              VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsSelected" Value="true">
                                <Setter TargetName="Bd" Property="Background" Value="Transparent" />
                                <Setter TargetName="Bd" Property="BorderBrush" Value="Transparent" />
                            </Trigger>
                            <Trigger Property="IsFocused" Value="true">
                                <Setter TargetName="Bd" Property="BorderBrush" Value="Transparent" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </ListView.ItemContainerStyle>
</ListView>

方案三：快速全局透传背景 #

如果上面两种方案没起效，直接给ListView及内部滚动视图设置透明背景，同时去掉边框：

<ListView Background="Transparent"
         BorderThickness="0"
         ScrollViewer.Background="Transparent">
    <!-- 你的列表内容 -->
</ListView>

注意：如果用了亚克力效果，要确保ListView的父容器也设置Background="Transparent"，保证背景透传生效。

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