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[Bug] OnChange Invoke error on ISyncLocalStorageService .NET 9 #253

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B2BSystems opened this issue Dec 18, 2024 · 5 comments
Open

[Bug] OnChange Invoke error on ISyncLocalStorageService .NET 9 #253

B2BSystems opened this issue Dec 18, 2024 · 5 comments
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Bug Something isn't working Triage Issue needs to be triaged

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@B2BSystems
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B2BSystems commented Dec 18, 2024 •
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Describe the bug
IJSInProcessRuntime not available is thrown when trying to read from local storage.
Developing a cart where I use OnChange event to update the cart item counter. This have worked before with older .NET version.

To Reproduce

@inject Blazored.LocalStorage.ISyncLocalStorageService LocalStorage
@implements IDisposable

....

private int GetCartItemCount()
{
    var cart = LocalStorage.GetItem<List<CartItemDto>>("b_cart"); // ERROR: IJSInProcessRuntime not available
    return cart != null ? cart.Count : 0;
}

// subscribe to the cart changes event
protected override void OnInitialized()
{
    CartService.OnChange += StateHasChanged;
}

public void Dispose()
{
    CartService.OnChange -= StateHasChanged;
}

After adding items to the cart I invoke the OnChange event.

public event Action OnChange;

....

await _localStorage.SetItemAsync("b_cart", cart);
OnChange.Invoke();

Expected behavior
Counter should be updated with number of items in cart.

Hosting Model (is this issue happening with a certain hosting model?):

  • Blazor WebAssembly .NET 9
@B2BSystems B2BSystems added Bug Something isn't working Triage Issue needs to be triaged labels Dec 18, 2024
@chrissainty
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This error is almost always because of trying to access local storage during a pre-rendering phase. What render mode are you using?

@B2BSystems
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I haven't configured any special render mode, but as it is a Blazor Webassembly I guess that the default is InteractiveWebAssembly.

@chrissainty
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Have you upgraded from .NET 8 or an earlier version?

@B2BSystems
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No, this is a new solution.
But I have used the same code before in .NET 7 where it worked.

@chrissainty
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There were some major changes in how things worked in .NET 8. It sounds like you might need to have a look into them. It sounds to me like you're possibly hitting the pre-rendering scenario.

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@chrissainty @B2BSystems