PersistentState attribute inconsistent behavior on page navigation #63129
Description
Is there an existing issue for this?
- I have searched the existing issues
Describe the bug
Scenario 1: Persistent state does not restore after page navigation
- Create a new Blazor Web App with Interactive Render mode with prerendering enabled(default)
- Update the counter component as below
@page "/counter"
@rendermode InteractiveServer
<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]
+ public int currentCount { get; set; }
+ protected override async Task OnInitializedAsync()
+ {
+ if (!RendererInfo.IsInteractive)
+ {
+ currentCount = 10;
+ }
+ }
private void IncrementCount()
{
currentCount++;
}
}- Launch the application and go to the counter page. It correctly shows 10
- Now, go back to the home page and come back to the counter page. The count flickers(unnoticable in the recording) and goes back to 0. When I debugged the component, first the component was server rendered and then rendered again in interactive mode on page navigation. But the persistent value was not restored
20250805-1059-20.9857512.mp4
Scenario 2: State restores after page navigation when added a small 1 second delay
- Now, add a small delay (1 second) before and after setting the counter value
@code {
[PersistentState]
public int currentCount { get; set; } = 5;
protected override async Task OnInitializedAsync()
{
if (!RendererInfo.IsInteractive)
{
+ await Task.Delay(1000);
currentCount = 10;
+ await Task.Delay(1000);
}
}
private void IncrementCount()
{
currentCount++;
}
}- Now, the same state is restored after page navigation
20250805-1111-05.8921160.mp4
This presents inconsistent behavior. My another question was - is it supposed to prerender on page navigation?
Expected Behavior
- Persistent state should be restored consistently on page navigation
Steps To Reproduce
No response
Exceptions (if any)
No response
.NET Version
10.0.100-rc.1.25401.103
Anything else?
No response