BlazorWebApp .Net 8 App State management

[vconfrence]

Description

Following Carl Franklin's application state management in blazor doesn't seem to work in .Net 8.

https://www.youtube.com/watch?v=4WPuGwxZKIA

The local storage instance and the renderfragment appear to be null. in addition getting The render handle is not yet assigned when calling statehaschanged() in the cascading app state throws the following exception "The render handle is not yet assigned."

Here's the github repo the project

https://github.com/vconfrence/BlazorApp1.git

CascadingAppState component which is meant to be a root level cascading value available through cascading parameter within any compoenent doesn't seem to work. LocalStorage and other variables don't seem to be initializing.

Also followed guidelines posted by Microsoft which didn't work

https://learn.microsoft.com/en-us/aspnet/core/blazor/components/cascading-values-and-parameters?preserve-view=true&view=aspnetcore-8.0#root-level-cascading-values

https://learn.microsoft.com/en-us/aspnet/core/blazor/state-management?view=aspnetcore-7.0&pivots=server#handle-prerendering

Page URL

https://learn.microsoft.com/en-us/aspnet/core/blazor/state-management?view=aspnetcore-8.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/state-management.md

Document ID

e5e1273b-195e-5da1-b4aa-66bbcff1425b

Article author

@guardrex

[github-actions]

🍂🎁 Happy Holidays! ❄️⛄

This issue has been marked for triage on the Blazor Docs GitHub project, and I'll respond as soon as I return from the holiday vacation the second week of January.

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[guardrex]

Carl Franklin's application state management in blazor

We can't support third-party content for Blazor, so that would need to be taken up with him.

Also followed guidelines posted by Microsoft which didn't work

Root-level cascading values do work (and that is the correct version of the article). The approaches described and the examples are functional AFAIK. You'd need to put up a minimal repro project of the behavior that you're describing. If you can't get our guidance to work, open an issue for the product unit at ...

https://github.com/dotnet/aspnetcore/issues

... and cross-link your minimal repro project so they can see what you're doing.

Please add ...

cc: @guardrex https://github.com/dotnet/AspNetCore.Docs/issues/31316

... to the bottom of your opening comment so that I can follow along. I might re-open this for doc work depending on what they say.

https://learn.microsoft.com/en-us/aspnet/core/blazor/state-management?view=aspnetcore-7.0&pivots=server#handle-prerendering

You're looking at the wrong version of the article. Change your doc version selector to 8.0 for this version of the guidance ...

https://learn.microsoft.com/en-us/aspnet/core/blazor/state-management?view=aspnetcore-8.0&pivots=server#handle-prerendering

[vconfrence]

Appreciate the comments. Here's the repo containing an example which shows root level cascading not working.
https://github.com/vconfrence/BlazorApp1.git