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Update the weather page in the Blazor Web App template to persist prerendered state #64644

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Update the weather page in the Blazor Web App template to persist prerendered state #64644

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Copilot Dec 3, 2025
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Update Weather.razor to persist prerendered state using [PersistentSt…
Copilot Dec 3, 2025
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34 changes: 19 additions & 15 deletions ...rojectTemplates/content/BlazorWeb-CSharp/BlazorWebCSharp.1/Components/Pages/Weather.razor
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@

<p>This component demonstrates showing data.</p>

@if (forecasts == null)
@if (Forecasts is null)
{
<p><em>Loading...</em></p>
}
Expand All @@ -25,7 +25,7 @@ else
</tr>
</thead>
<tbody>
@foreach (var forecast in forecasts)
@foreach (var forecast in Forecasts)
{
<tr>
<td>@forecast.Date.ToShortDateString()</td>
Expand All @@ -39,28 +39,32 @@ else
}

@code {
private WeatherForecast[]? forecasts;
[PersistentState]
public WeatherForecast[]? Forecasts { get; set; }

protected override async Task OnInitializedAsync()
{
if (Forecasts is null)
{
@*#if (InteractiveAtRoot) -->
// Simulate asynchronous loading to demonstrate a loading indicator
// Simulate asynchronous loading to demonstrate a loading indicator
##else
// Simulate asynchronous loading to demonstrate streaming rendering
// Simulate asynchronous loading to demonstrate streaming rendering
##endif*@
await Task.Delay(500);
await Task.Delay(500);

var startDate = DateOnly.FromDateTime(DateTime.Now);
var summaries = new[] { "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching" };
forecasts = Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
Date = startDate.AddDays(index),
TemperatureC = Random.Shared.Next(-20, 55),
Summary = summaries[Random.Shared.Next(summaries.Length)]
}).ToArray();
var startDate = DateOnly.FromDateTime(DateTime.Now);
var summaries = new[] { "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching" };
Forecasts = Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
Date = startDate.AddDays(index),
TemperatureC = Random.Shared.Next(-20, 55),
Summary = summaries[Random.Shared.Next(summaries.Length)]
}).ToArray();
}
}

private class WeatherForecast
public class WeatherForecast
{
public DateOnly Date { get; set; }
public int TemperatureC { get; set; }
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