[StateHasChangedAsync] System.NullReferenceException: 'Object reference not set to an instance of an object.' about stl.fusion

[timeshift92]

Everything is fine! Thank you

[alexyakunin]

Hi, looks like you're getting this exception from Blazorise.BaseComponent - i.e. makes sense to look its source code, if it's still available, or decompile it.

One important thing, though: looks like it was called from Fusion's helper allowing to call StateHasChanged (protected method) on another component, which normally is ok only if another component is written in a way it expects this - i.e. it doesn't assume in its own code that only it may call this method.

[alexyakunin]

In short, if you call StateHasChangedAsync on some other component, you must take into acc. the default behavior / assumptions about StateHasChanged.

[timeshift92]

i have run your example https://github.com/servicetitan/Stl.Fusion/tree/master/samples/TodoApp,
and did not change anything, when he looked on the stack, he swore at blazorise

[alexyakunin]

I see - will check it out today, prob. Blazorise update.

[alexyakunin]

@timeshift92 I fixed the issue. I guess you've updated to the latest Fusion version & got one - that's because v2.1 got a number of changes related to IState there, and in particular, the initial IState<T> value is default(T) now rather than the result of a call of parameterless constructor for type T. This is what was causing ~ a similar issue (NullReferenceException) in most of samples after I upgraded them.

[alexyakunin]

Besides that, all the samples are now updated to the lastest Fusion.

[alexyakunin]

Please confirm if the issue is gone on your end and I'll close the ticket :)