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Blazor, Held TogetherComponent Discipline · Rule 2

Component Discipline

Rule 2Chapter I

Parameters flow down; EventCallbacks flow up.

Why this rule exists

The moment a child mutates a parent's object directly, the render dependency graph stops being knowable. The bugs this creates appear far from their cause.

Blazor, Held Together

In practice

Pass immutable-ish values and records down. When a child needs to change something, it raises an EventCallback and the owner mutates its own state.

When it doesn't apply

Cascading values for genuinely app-wide concerns (theme, auth state) — sparingly, and read-only.

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