WPF：如何删除 MenuItem 边框

Question

所以我有简单的 MenuItem:

<ListView.ContextMenu>
    <ContextMenu Name="cmCopy">
        <MenuItem Style="{StaticResource MenuItemDefaultStyle}" Header="Copy" Click="MenuItem_Click"/>
    </ContextMenu>
</ListView.ContextMenu>

还有我的Style：

<Style x:Key="MenuItemDefaultStyle" TargetType="{x:Type MenuItem}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type MenuItem}">
                <Grid SnapsToDevicePixels="true">
                    <DockPanel>
                        <ContentPresenter x:Name="Icon" ContentSource="Icon" Margin="4,0,6,0" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center"/>
                        <Path x:Name="GlyphPanel" Fill="{TemplateBinding Foreground}" FlowDirection="LeftToRight" Margin="7,0,0,0" Visibility="Collapsed" VerticalAlignment="Center"/>
                        <ContentPresenter x:Name="content" ContentSource="Header" Width="40" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                    </DockPanel>
                    <Popup x:Name="PART_Popup" AllowsTransparency="true" Focusable="false" HorizontalOffset="1" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}" Placement="Bottom" VerticalOffset="-1">

                        <Border BorderThickness="0" BorderBrush="Transparent" Background="{TemplateBinding Background}">
                            <ScrollViewer x:Name="SubMenuScrollViewer" CanContentScroll="true" Style="{DynamicResource {ComponentResourceKey ResourceId=MenuScrollViewer, TypeInTargetAssembly={x:Type FrameworkElement}}}">
                                <Grid RenderOptions.ClearTypeHint="Enabled">
                                    <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Cycle" Grid.IsSharedSizeScope="true" Margin="2" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.TabNavigation="Cycle"/>
                                </Grid>
                            </ScrollViewer>
                        </Border>
                    </Popup>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="TextBlock.Foreground" Value="Blue" TargetName="content"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

我真的很想删除 MenuItem 周围的边框。

尽管我这样定义：'

<Border BorderThickness="0" BorderBrush="Transparent" Background="{TemplateBinding Background}">

我还能看到黑色Border笔刷。

更新

Answer 1

您的模板不是 MenuItem 收到的唯一模板。

MenuItem 根据其作用有几个模板。

可以是一片叶子。它可以是 Parent 和 children。它可以是没有 children 的 parent。

如您所见：

https://docs.microsoft.com/en-us/dotnet/framework/wpf/controls/menu-styles-and-templates

您需要修改所有这些才能实现此目的。

Answer 2

Mishka 说得对，它来自 ContextMenu 样式。这是一个默认样式，请参阅我在其中的评论以获得您想要的。

<Color x:Key="WindowColor">#FFE8EDF9</Color>
<Color x:Key="ContentAreaColorLight">#FFC5CBF9</Color>
<Color x:Key="ContentAreaColorDark">#FF7381F9</Color>

<Color x:Key="DisabledControlLightColor">#FFE8EDF9</Color>
<Color x:Key="DisabledControlDarkColor">#FFC5CBF9</Color>
<Color x:Key="DisabledForegroundColor">#FF888888</Color>

<Color x:Key="SelectedBackgroundColor">#FFC5CBF9</Color>
<Color x:Key="SelectedUnfocusedColor">#FFDDDDDD</Color>

<Color x:Key="ControlLightColor">White</Color>
<Color x:Key="ControlMediumColor">#FF7381F9</Color>
<Color x:Key="ControlDarkColor">#FF211AA9</Color>

<Color x:Key="ControlMouseOverColor">#FF3843C4</Color>
<Color x:Key="ControlPressedColor">#FF211AA9</Color>


<Color x:Key="GlyphColor">#FF444444</Color>
<Color x:Key="GlyphMouseOver">sc#1, 0.004391443, 0.002428215, 0.242281124</Color>

<!--Border colors-->
<Color x:Key="BorderLightColor">#FFCCCCCC</Color>
<Color x:Key="BorderMediumColor">#FF888888</Color>
<Color x:Key="BorderDarkColor">#FF444444</Color>

<Color x:Key="PressedBorderLightColor">#FF888888</Color>
<Color x:Key="PressedBorderDarkColor">#FF444444</Color>

<Color x:Key="DisabledBorderLightColor">#FFAAAAAA</Color>
<Color x:Key="DisabledBorderDarkColor">#FF888888</Color>

<Color x:Key="DefaultBorderBrushDarkColor">Black</Color>

<!--Control-specific resources.-->
<Color x:Key="HeaderTopColor">#FFC5CBF9</Color>
<Color x:Key="DatagridCurrentCellBorderColor">Black</Color>
<Color x:Key="SliderTrackDarkColor">#FFC5CBF9</Color>

<Color x:Key="NavButtonFrameColor">#FF3843C4</Color>

<LinearGradientBrush x:Key="MenuPopupBrush"
                     EndPoint="0.5,1"
                     StartPoint="0.5,0">
  <GradientStop Color="{DynamicResource ControlLightColor}"
                Offset="0" />
  <GradientStop Color="{DynamicResource ControlMediumColor}"
                Offset="0.5" />
  <GradientStop Color="{DynamicResource ControlLightColor}"
                Offset="1" />
</LinearGradientBrush>

<LinearGradientBrush x:Key="ProgressBarIndicatorAnimatedFill"
                     StartPoint="0,0"
                     EndPoint="1,0">
  <LinearGradientBrush.GradientStops>
    <GradientStopCollection>
      <GradientStop Color="#000000FF"
                    Offset="0" />
      <GradientStop Color="#600000FF"
                    Offset="0.4" />
      <GradientStop Color="#600000FF"
                    Offset="0.6" />
      <GradientStop Color="#000000FF"
                    Offset="1" />
    </GradientStopCollection>
  </LinearGradientBrush.GradientStops>
</LinearGradientBrush>

<Style TargetType="{x:Type ContextMenu}">
  <Setter Property="SnapsToDevicePixels"
          Value="True" />
  <Setter Property="OverridesDefaultStyle"
          Value="True" />
  <Setter Property="Grid.IsSharedSizeScope"
          Value="true" />
  <Setter Property="HasDropShadow"
          Value="True" />
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type ContextMenu}">
        <Border x:Name="Border"
                Background="{StaticResource MenuPopupBrush}"
                BorderThickness="1">
          <Border.BorderBrush>
            <SolidColorBrush Color="{StaticResource BorderMediumColor}" /><!-- Set this brush to transparent -->
          </Border.BorderBrush>
          <StackPanel IsItemsHost="True"
                      KeyboardNavigation.DirectionalNavigation="Cycle" />
        </Border>
        <ControlTemplate.Triggers>
          <Trigger Property="HasDropShadow"
                   Value="true">
            <Setter TargetName="Border"
                    Property="Padding"
                    Value="0,3,0,3" />
            <Setter TargetName="Border"
                    Property="CornerRadius"
                    Value="4" />
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

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