FluxorStatePattern-FunctionalReuseExample.cs

using Fluxor;
using Microsoft.Extensions.DependencyInjection;

var services = new ServiceCollection();
services.AddFluxor(x =>
{
	x.ScanAssemblies(typeof(Program).Assembly);
	// PRO: No need to register lots of generic classes here
});

var sp = services.BuildServiceProvider();
var dispatcher = sp.GetRequiredService<IDispatcher>();
var store = sp.GetRequiredService<IStore>();
await store.InitializeAsync();
dispatcher.Dispatch(new ChangeCommonState<State1>());
dispatcher.Dispatch(new ChangeCommonState<State2>());
dispatcher.Dispatch(new ChangeCommonState<State2>());
Console.ReadLine();


public record CommonState(int Counter);

[FeatureState]
public record State1
{
	public CommonState CommonState { get; init; } = new CommonState(0);
}

[FeatureState]
public record State2
{
	public CommonState CommonState { get; init; } = new CommonState(0);
}

public record ChangeCommonState<TFeatureState>();

// Reducer class for State1 that uses a common CommonStateReduers.Reduce method
public static class State1Reducers
{
	// CON: You have to write a reducer method for the action for every feature state
	[ReducerMethod]
	public static State1 Reduce(State1 state, ChangeCommonState<State1> action)
	=>
		state with { CommonState = CommonStateReducers.Reduce(state.CommonState, action) };
}

// Reducer class for State2 that uses a common CommonStateReduers.Reduce method
public static class State2Reducers
{
	// CON: You have to write a reducer method for the action for every feature state
	[ReducerMethod]
	public static State1 Reduce(State1 state, ChangeCommonState<State2> action)
	=>
		state with { CommonState = CommonStateReducers.Reduce(state.CommonState, action) };
}

// A class that reduces actions for CommonState
// This is called explicitly from other reducers
public static class CommonStateReducers
{
	public static CommonState Reduce<TFeatureState>(
		CommonState state,
		ChangeCommonState<TFeatureState> action)
	=>
		state with { Counter = state.Counter + 1 };
		
}