Individual skill

coordinate-components

Share state between components that don't have a direct parent-child parameter relationship, using cascading values, scoped services with change events, or CascadingValueSource via DI. USE WHEN the user needs a CascadingParameter or CascadingValue that works across render mode boundaries, a shopping cart or notification count accessible from multiple pages, a theme or user preference cascaded app-wide, or when components in different parts of the tree must react when shared data changes. Also USE WHEN cascading values aren't reaching interactive children in per-page interactivity mode, or when the user needs to understand scoped vs singleton service lifetime for state on Blazor Server. DO NOT USE for direct parent-child parameter passing or EventCallback (see author-component), for persisting state across prerender-to-interactive transitions (see support-prerendering), or for service abstractions for data fetching in Auto/WebAssembly (see fetch-and-send-data).

plugins/dotnet-blazor/skills/coordinate-components/SKILL.md

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Nov 8, 2026
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# Coordinate Components

## Step 1 — Read AGENTS.md

Read `AGENTS.md` at the workspace root to learn the project's conventions before making changes.

## Step 2 — Decide the scope

| Need | Mechanism | When to use |
|------|-----------|-------------|
| Subtree (same render mode) | `CascadingValue` component | Theme, layout config within a layout |
| App-wide (all render modes) | `CascadingValueSource<T>` via DI | Current user, feature flags, theme shared globally |
| Mutable shared state within a circuit | Scoped service + `Action` event | Shopping cart, notification count, selected filters |
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