ant-design-blazor/components/menu/internal/SubMenuTrigger.razor

@namespace AntDesign.Internal
@inherits OverlayTrigger

@{
    string prefixCls = $"{SubMenuComponent.RootMenu.PrefixCls}-submenu";
}
<li class="@TriggerClass"
    role="menuitem"
    style="position:relative;@SubMenuComponent.Style"
    @key="SubMenuComponent.Key"
    @ref="@Ref"
    @onclick="OnClickDiv"
    @onmouseenter="OnTriggerMouseEnter"
    @onmouseleave="OnTriggerMouseLeave"
    @oncontextmenu="OnTriggerContextmenu"
    @oncontextmenu:preventDefault>
    @ChildContent
</li>

<CascadingValue Value="this" Name="Trigger">
    <Overlay @ref="_overlay"
             OverlayChildPrefixCls="@($"{prefixCls}-menu")"
             OnOverlayMouseEnter="OnOverlayMouseEnter"
             OnOverlayMouseLeave="OnOverlayMouseLeave" />
</CascadingValue>