PersistentState doesn't work on non-public properties

[AndreiGorlov]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Persistent state not persisting if [PersistentState] applied to non-public property

Expected Behavior

PersistentStateAttribute should work with private properties

Steps To Reproduce

Counter page:

@page "/counter"

<PageTitle>Counter</PageTitle>

<h1>Counter</h1>

<p role="status">Current count: @CurrentCount</p>

<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>

@code {
    [PersistentState]
    private int? CurrentCount { get; set; }

    protected override void OnInitialized()
    {
        CurrentCount ??= Random.Shared.Next(100);
    }

    private void IncrementCount()
    {
        CurrentCount++;
    }
}

Exceptions (if any)

log error when navigate to /counter page:

fail: Microsoft.AspNetCore.Components.Infrastructure.ComponentStatePersistenceManager[1000]
      There was an error executing a callback while pausing the application.
      System.InvalidOperationException: Property CurrentCount not found on type BlazorPersistentStatePlayground.Client.Pages.Counter
         at Microsoft.AspNetCore.Components.Infrastructure.PersistentStateValueProvider.PropertyGetterFactory(ValueTuple`2 key)
         at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
         at Microsoft.AspNetCore.Components.Infrastructure.PersistentStateValueProvider.ResolvePropertyGetter(Type type, String propertyName)
         at Microsoft.AspNetCore.Components.Infrastructure.PersistentStateValueProvider.<>c__DisplayClass13_0.<Subscribe>b__0()
         at Microsoft.AspNetCore.Components.Infrastructure.ComponentStatePersistenceManager.<TryPauseAsync>g__TryExecuteCallback|18_0(Func`1 callback, ILogger`1 logger)

.NET Version

10.0.0-preview.7.25380.108

Anything else?

No response

[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• PersistentState attribute throws InvalidOperationException at runtime when used with private property #62859

[javiercn]

@AndreiGorlov thanks for contacting us.

This is by design, CascadingParameters and other form of parameters (which PersistentComponentState is a form of) must be public properties.

[AndreiGorlov]

This is by design, CascadingParameters and other form of parameters (which PersistentComponentState is a form of) must be public properties.

Is there any good reason why I must expose a component internal state?
Also [CascadingParameter] works fine with non-public props. So I don't get your point.

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