Exploring Actions, Effects, and the Benefits of Fluxor in Blazor

Modern web applications are becoming increasingly complex, and with that complexity comes the need for structured and maintainable state management.

In the world of Blazor—a modern, .NET-based web UI framework—Fluxor offers a powerful and intuitive state container that brings predictable state flow to your applications.

Fluxor is a zero-boilerplate Flux/Redux library for .NET that adapts the proven Redux pattern from the JavaScript ecosystem for C# developers. It promotes clean architecture and unidirectional data flow, making it ideal for building scalable and testable Blazor apps.

Let’s break down the core concepts of Fluxor and show how you can use Actions, Reducers, and Effects to create a clean, maintainable architecture.

🔗 Explore the GitHub sample project

💡 What is Fluxor?

Fluxor provides a structured and predictable way to manage state in your Blazor application. Inspired by Redux, it embraces:

• Unidirectional data flow – State changes follow a clear path: Action ➝ Reducer ➝ State ➝ UI
• Single source of truth – All state lives in a centralized, immutable store
• Middleware and Effects – Separate side-effects like API calls from your UI and business logic

Unlike many Redux implementations, Fluxor reduces boilerplate with C#-friendly conventions and strong typing.

🎯 Actions – Declaring Intent

In Fluxor, Actions are simple messages that describe what happened. They don’t contain logic—they just signal intent.

public record FetchItemsAction;
public record FetchItemsSuccessAction(List<Item> Items);
public record FetchItemsFailedAction(string ErrorMessage);

⚙️ Effects – Handling Side Effects

Since Reducers must be pure, Fluxor uses Effects to handle asynchronous operations like API calls without cluttering your business logic.

public class ItemEffects
{
    [EffectMethod]
    public async Task HandleFetchItems(FetchItemsAction action, IDispatcher dispatcher)
    {
        try
        {
            var items = await itemService.GetItemsAsync();
            dispatcher.Dispatch(new FetchItemsSuccessAction(items));
        }
        catch (Exception ex)
        {
            dispatcher.Dispatch(new FetchItemsFailedAction(ex.Message));
        }
    }
}

This Effect listens for FetchItemsAction and performs the API call, dispatching the success or failure result accordingly.

🧠 State and Reducers – Updating the Store

public static class ItemReducers
{
    [ReducerMethod]
    public static ItemState OnFetchSuccess(ItemState state, FetchItemsSuccessAction action) =>
        state with { Items = action.Items, IsLoading = false };

    [ReducerMethod]
    public static ItemState OnFetchFailed(ItemState state, FetchItemsFailedAction action) =>
        state with { ErrorMessage = action.ErrorMessage, IsLoading = false };
}

Reducers never mutate the current state—they return a new version of it, keeping your state management predictable and testable.

🧪 Try It Yourself
Check out the working example project on GitHub to see all these concepts in action:

👉 BlazorAndFluxorStateMachine GitHub Sample

The sample demonstrates:

• Dispatching actions from UI components
• Handling async logic with Effects
• Writing clean and testable Reducers
• Integrating Fluxor into real Blazor components

✅ Why Use Fluxor?
🧼 No boilerplate overload – Clean and expressive C# syntax

🧪 Testable state transitions – Logic is centralized and deterministic

🧱 Scales well – Great for large, complex Blazor apps

🔁 Familiar architecture – Redux pattern adapted for .NET

🧩 Separation of concerns – Keeps UI, state, and side-effects neatly separated

📚 References

Fluxor GitHub Repository

Redux Official Site

Angular Redux

Blazor Documentation – Microsoft