Calling StateHasChanged() does not reload Page and Extension Components

[luckyluggi]

Bug Report

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Prerequisites

• Can you reproduce the problem in a MWE?
• Are you running the latest version?
• Did you perform a search in the issues?

Environment Details and Version

[Package Version, Blazor Version, OS, Browser,...]

Description

Hy. I've been tracking down a problem in my app and i think i've found the source of the problem now.
I have created this mvp to show the problem:
https://github.com/luckyluggi/-mvp_piral_statehaschanged

There i have a StateContainer (my-pilet\State\ShoppingCartState.cs) with Items.
Whenever i add items i call StateHasChanged() in my-pilet\Pages\ShopPage.razor and my-pilet\Components\ShoppingCartIcon.razor but the state does not get updated.

Steps to Reproduce

see mvp

Expected behavior

Component should reload and show new state

Actual behavior

does not reload

Possible Origin / Solution

[Optionally, share your idea to fix the issue]

[FlorianRappl]

Actually the StateHasChanged works fine.

The problem is in the event handler. If you disable the first handler (just comment out the one in Shop you'll see everything updates (except the Shop). I'll investigate this.

[FlorianRappl]

Alright so changing the service from AddScoped to AddSingleton did the job. From official documentation:

Scoped objects are the same within a request, but different across different requests.

Apparently, we had different requests beforehand. We've seen two objects being created.

Singleton objects are the same for every object and every request.

Now we force it to be the same. And it works.