PersistentState being lost with multiple calls to OnParametersSetAsync #63435
Closed as duplicate of#63129
Description
Is there an existing issue for this?
- I have searched the existing issues
Describe the bug
There does not seem to be a way to use PersistentState when OnParametersSetAsync is being called multiple times. The property is always null.
@page "/counter"
<PageTitle>Prerendered Counter 2</PageTitle>
<h1>Prerendered Counter 2</h1>
<p role="status">Current count: @State?.CurrentCount</p>
<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
@code {
[Parameter]
public int? SompeParameter { get; set; }
[PersistentStateAttribute]
public CounterState? State { get; set; }
protected override async Task OnInitializedAsync()
{
if (State is null)
{
State = new() { CurrentCount = Random.Shared.Next(100) };
}
}
protected override async Task OnParametersSetAsync()
{
//This runs twice because SompeParameter is being set in the parent after a delay
//When this runs State is always null and resets State to null
}
private void IncrementCount()
{
if (State is not null)
{
State.CurrentCount++;
}
}
public class CounterState
{
public int CurrentCount { get; set; }
}
}
Expected Behavior
The parameter should only be around once and most likely in OnInitializedAsync.
Steps To Reproduce
Maybe I am using this feature incorrectly. PersistenState seems to work great when no parameters are passed to the component as in most examples i have found.
Exceptions (if any)
No response
.NET Version
10.0.0-preview.7.25380.108
Anything else?
No response