c# - Blazor web app, global InteractiveServer, .NET 9. Localization. During culture change strange exceptions occur - Stack Over

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I follow the localization directions from Microsoft at Globalization and localization.

It doesn't work as expected and has also obvious mistakes (like confusing app.razor with routes.razor).

Anyway, localization starts to work, according to instruction (dynamically set the server-side culture by user preference), with the following change.

Instead of

var supportedCultures = new[] { "en-US", "es-CR" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
    
 app.UseRequestLocalization(localizationOptions);

I use:

public static CultureInfo[] SupportedCultures =
   [
      new CultureInfo("el-GR"),
      new CultureInfo("en-US"),
   ];

builder.Services.AddLocalization();
builder.Services.Configure<RequestLocalizationOptions>(options =>
{
    options.SupportedCultures = SupportedCultures;
    options.SupportedUICultures = SupportedCultures;
    options.RequestCultureProviders.Clear();
    options.RequestCultureProviders.Insert(0, new CookieRequestCultureProvider());
    options.DefaultRequestCulture = new RequestCulture(culture: "el-GR");

});
builder.Services.AddControllers();

The problem is that every culture change is filled with exceptions:

Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll
Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll
Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.Net.WebSockets.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.Private.CoreLib.dll

As the app is restarted, all server interactive components are disposed and re-initialized several times (during prerender then for rendering etc.).

These 5 exceptions are thrown with an empty template project. If the project grows bigger then my screen is filled with exceptions. It looks like all the components created, even if I do take care to gracefully dispose my own code, Microsoft hasn't done the same for its own code.

Does anyone have any idea?

Update: By adding a couple of working components the number of exceptions is frightening:

Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.JSInterop.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.JSInterop.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.JSInterop.dll Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.Net.WebSockets.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.JSInterop.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.dll <Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.dll <Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll <Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll

I follow the localization directions from Microsoft at Globalization and localization.

It doesn't work as expected and has also obvious mistakes (like confusing app.razor with routes.razor).

Anyway, localization starts to work, according to instruction (dynamically set the server-side culture by user preference), with the following change.

Instead of

var supportedCultures = new[] { "en-US", "es-CR" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
    
 app.UseRequestLocalization(localizationOptions);

I use:

public static CultureInfo[] SupportedCultures =
   [
      new CultureInfo("el-GR"),
      new CultureInfo("en-US"),
   ];

builder.Services.AddLocalization();
builder.Services.Configure<RequestLocalizationOptions>(options =>
{
    options.SupportedCultures = SupportedCultures;
    options.SupportedUICultures = SupportedCultures;
    options.RequestCultureProviders.Clear();
    options.RequestCultureProviders.Insert(0, new CookieRequestCultureProvider());
    options.DefaultRequestCulture = new RequestCulture(culture: "el-GR");

});
builder.Services.AddControllers();

The problem is that every culture change is filled with exceptions:

Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll
Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll
Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.Net.WebSockets.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.Private.CoreLib.dll

As the app is restarted, all server interactive components are disposed and re-initialized several times (during prerender then for rendering etc.).

These 5 exceptions are thrown with an empty template project. If the project grows bigger then my screen is filled with exceptions. It looks like all the components created, even if I do take care to gracefully dispose my own code, Microsoft hasn't done the same for its own code.

Does anyone have any idea?

Update: By adding a couple of working components the number of exceptions is frightening:

Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.JSInterop.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.JSInterop.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.JSInterop.dll Exception thrown: 'System.IO.IOException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.Net.WebSockets.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.JSInterop.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.AspNetCore.Components.Server.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in Microsoft.JSInterop.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'Microsoft.JSInterop.JSDisconnectedException' in System.Private.CoreLib.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.dll Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.dll <Exception thrown: 'System.InvalidOperationException' in Microsoft.AspNetCore.Components.dll <Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll <Exception thrown: 'System.InvalidOperationException' in System.Private.CoreLib.dll

• c#
• asp-core
• blazor
• localization
• -9.0

Share Improve this question Follow edited Mar 20 at 0:54 Zhi Lv 22k11 gold badge2727 silver badges3737 bronze badges asked Mar 18 at 6:56 nefennefen 82788 silver badges88 bronze badges 2

• app.razor vs routes.razor depends on the template and version. – Henk Holterman Commented Mar 18 at 12:06
• Yes, but not on 9, this guide is dedicated. – nefen Commented Mar 18 at 14:58

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2 Answers 2

Sorted by: Reset to default 1

A minimal example based on default Blazor App template and your codes that works on my side:

Project structure:

Program.cs;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
CultureInfo[] SupportedCultures =
  [
     new CultureInfo("el-GR"),
      new CultureInfo("en-US"),
   ];


builder.Services.AddLocalization();
builder.Services.Configure<RequestLocalizationOptions>(options =>
{
    options.SupportedCultures = SupportedCultures;
    options.SupportedUICultures = SupportedCultures;
    options.RequestCultureProviders.Clear();
    options.RequestCultureProviders.Insert(0, new CookieRequestCultureProvider());
    options.DefaultRequestCulture = new RequestCulture(culture: "el-GR");

});
builder.Services.AddControllers();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    
    app.UseHsts();
}

app.UseHttpsRedirection();


app.UseAntifery();


app.UseRequestLocalization();

app.MapStaticAssets();
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();
app.MapControllers();

app.Run();

App.razor:

@using System.Globalization
@using Microsoft.AspNetCore.Localization

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <base href="/" />
    <link rel="stylesheet" href="@Assets["lib/bootstrap/dist/css/bootstrap.min.css"]" />
    <link rel="stylesheet" href="@Assets["app.css"]" />
    <link rel="stylesheet" href="@Assets["BlazorLocalize.styles.css"]" />
    <ImportMap />
    <link rel="icon" type="image/png" href="favicon.png" />
    <HeadOutlet @rendermode="InteractiveServer" />
</head>

<body>
    <Routes @rendermode="InteractiveServer" />
    <script src="_framework/blazor.web.js"></script>
</body>

</html>

@code {
    [CascadingParameter]
    public HttpContext? HttpContext { get; set; }

    protected override void OnInitialized()
    {
        HttpContext?.Response.Cookies.Append(
            CookieRequestCultureProvider.DefaultCookieName,
            CookieRequestCultureProvider.MakeCookieValue(
                new RequestCulture(
                    CultureInfo.CurrentCulture,
                    CultureInfo.CurrentUICulture)));
    }
}

CultureSelector component:

@using System.Globalization
@inject IJSRuntime JS
@inject NavigationManager Navigation

<p>
    <label>
        Select your locale:
        <select @bind="selectedCulture" @bind:after="ApplySelectedCultureAsync">
            @foreach (var culture in supportedCultures)
            {
                <option value="@culture">@culture.DisplayName</option>
            }
        </select>
    </label>
</p>

@code
{
    private CultureInfo[] supportedCultures = new[]
    {
        new CultureInfo("en-US"),
        new CultureInfo("el-GR"),
    };

    private CultureInfo? selectedCulture;

    protected override void OnInitialized()
    {
        selectedCulture = CultureInfo.CurrentCulture;
    }

    private async Task ApplySelectedCultureAsync()
    {
        if (CultureInfo.CurrentCulture != selectedCulture)
        {
            var uri = new Uri(Navigation.Uri)
                .GetComponents(UriComponents.PathAndQuery, UriFormat.Unescaped);
            var cultureEscaped = Uri.EscapeDataString(selectedCulture.Name);
            var uriEscaped = Uri.EscapeDataString(uri);

            Navigation.NavigateTo(
                $"Culture/Set?culture={cultureEscaped}&redirectUri={uriEscaped}",
                forceLoad: true);
        }
    }
}

MainLayout component:

@inherits LayoutComponentBase
@using BlazorLocalize.Components.Pages

<div class="page">
    <div class="sidebar">
        <NavMenu />
    </div>

    <main>
        <div class="top-row px-4">
            <a href="https://learn.microsoft/aspnet/core/" target="_blank">About</a>
        </div>
        <article class="bottom-row px-4">
            <CultureSelector />
        </article>

        <article class="content px-4">
            @Body
        </article>
    </main>
</div>

<div id="blazor-error-ui" data-nosnippet>
    An unhandled error has occurred.
    <a href="." class="reload">Reload</a>
    <span class="dismiss">

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