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

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Button Content="Open ContextMenu" Click="Button_Click">
            <Button.ContextMenu>
                <ContextMenu>
                    <MenuItem Header="Item 1" Template="{StaticResource MenuItemTemplate}"/>
                    <MenuItem Header="Item 2" Template="{StaticResource MenuItemTemplate}"/>
                </ContextMenu>
            </Button.ContextMenu>
        </Button>
    </Grid>
</Window>

<ControlTemplate x:Key="MenuItemTemplate" TargetType="{x:Type MenuItem}">
    <Border Background="LightGray" BorderBrush="Black" BorderThickness="1">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="{TemplateBinding Header}" Margin="5"/>
            <Button Content="Click Me" Width="50" Click="Button_Click_1"/>
        </StackPanel>
    </Border>
    <ControlTemplate.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter TargetName="Border" Property="Background" Value="Yellow"/>
        </Trigger>
    </ControlTemplate.Triggers>
</ControlTemplate>

private void Button_Click(object sender, RoutedEventArgs e)
{
    Button btn = sender as Button;
    btn.ContextMenu.IsOpen = true;
}

private void Button_Click_1(object sender, RoutedEventArgs e)
{
    // 处理点击事件，但不关闭 ContextMenu
    MessageBox.Show("Item clicked!");
    e.Handled = true; // 阻止事件进一步传播
}