Method UseStore

Subscribes to an external Store via a selector. Must be used inside Render() only.

public static TSel UseStore<TStore, TSel>(Store<TStore> store, Func<TStore, TSel> selector, IEqualityComparer<TSel>? comparer = null)

store Store<TStore>: Store instance to subscribe to. Must not be null.
selector Func<TStore, TSel>: Pure projection from the store snapshot to the value the component cares about. Must not be null.
comparer IEqualityComparer<TSel>: Equality comparer used to detect changes. The default applies the same Object.is rule as the UseState setter, branch for branch — see the remarks on StateUpdater<T>. Passing System.Collections.Generic.EqualityComparer<T>.Default therefore changes a non-string reference-type selector, where it swaps instance identity for the type's own Equals so that a selector returning a fresh record class instance of stable content skips the re-render instead of triggering one. For a string selector, or a value-type selector other than float/double — a record struct included — the default already gives the same answer as that comparer, so passing it changes nothing.