覆盖MenuItem ControlTemplate可防止在单击项目时关闭ContextMenu

<Window.Resources>
    <Style x:Key="MenuItemStyle" TargetType="MenuItem">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="MenuItem">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
                        <ContentPresenter Grid.Row="0" Content="{TemplateBinding Header}"/>
                        <ItemsPresenter Grid.Row="1" Margin="10,0,0,0"/>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Background" Value="LightBlue"/>
                        </Trigger>
                        <EventTrigger RoutedEvent="Click">
                            <EventTrigger.Actions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <!-- 在这里可以添加自定义的逻辑，比如执行命令或处理单击事件 -->
                                    </Storyboard>
                                </BeginStoryboard>
                            </EventTrigger.Actions>
                        </EventTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>

<Grid>
    <Grid.ContextMenu>
        <ContextMenu>
            <MenuItem Header="菜单项1" Style="{StaticResource MenuItemStyle}"/>
            <MenuItem Header="菜单项2" Style="{StaticResource MenuItemStyle}"/>
            <MenuItem Header="菜单项3" Style="{StaticResource MenuItemStyle}"/>
        </ContextMenu>
    </Grid.ContextMenu>
    
    <!-- 其他界面元素 -->
</Grid>