Breadcrumbs

<BreadCrumbs /> renders a breadcrumb trail derived from the current NavigationManager route. BreadCrumbService (registered scoped by AddThargaBlazor) lets you customize the trail for routes whose URL doesn't tell the full story.

Default render

<BreadCrumbs />

For a route like /projects/42/details, this renders Home › Projects › 42 › Details with each segment linked back to its prefix path.

Add a virtual segment

When a UI surface lives "inside" a logical parent that isn't in the URL — for example, a modal-spawned subview — push a virtual breadcrumb manually:

@inject BreadCrumbService BreadCrumbService

protected override void OnInitialized()
{
    BreadCrumbService.AddVirtualSegment("Details", "/items/42");
}

The virtual segment shows up alongside the route-derived segments until the next navigation.

Promote a query parameter

Some routes use query parameters as meaningful sub-context (e.g. ?category=invoices). Register the param and the value becomes a breadcrumb segment:

BreadCrumbService.RegisterVirtualSegmentQueryParam("category");

Now /items?category=invoices renders Home › Items › invoices.

Relink / unlink segments

Override the destination of a generated segment, or strip its link so it renders as plain text:

// Override target URL of an existing segment
BreadCrumbService.RelinkSegment("Items", "/items?status=active");

// Render a segment as text (no link)
BreadCrumbService.UnlinkSegment("Current");

Rendering inside a layout

Drop <BreadCrumbs /> in your MainLayout.razor once and it picks up route changes automatically — no per-page wiring required.