What tools or libraries do you use for application state management in your practice?

In C#, the following tools and libraries are often used for managing application state:

• MVVM frameworks (e.g., Prism, MVVM Light) — help organize logic and state in UI applications.
• Reactive Extensions (Rx.NET) — for reactive management of data streams and state.
• State Containers — simple classes or services that store state and notify subscribers of changes.
• Redux-like libraries (e.g., Redux.NET) — for centralized state management with predictable changes.

Example of a simple state container:

public class AppState
{
    private int _counter;
    public event Action OnChange;

    public int Counter
    {
        get => _counter;
        set
        {
            _counter = value;
            NotifyStateChanged();
        }
    }

    private void NotifyStateChanged() => OnChange?.Invoke();
}

This approach allows components to subscribe to state changes and update the UI accordingly.