Set default culture

Kuler Master 406

Hello guys,

I am using Microsoft.Extensions.Localization (8.0.11) but for some reason the following code does not work as expected. As you see, I expect the German to be default language but it's always English. Am I missing something?

var supportedCultures = new[] { "de-DE", "en-US" }; 
var localizationOptions = new RequestLocalizationOptions()     
.SetDefaultCulture("de-DE")     
.AddSupportedCultures(supportedCultures)     
.AddSupportedUICultures(supportedCultures);

Thank you

AgaveJoe 29,781 Reputation points

2025-02-07T11:03:20.8433333+00:00

Where and when does the code block execute? Can you provide a working example so we can understand how your code works?

The official documentation has strategies for handling culture in a asp.net Core app. .https://learn.microsoft.com/en-us/aspnet/core/blazor/globalization-localization?view=aspnetcore-9.0

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/localization/select-language-culture?view=aspnetcore-9.0
Kuler Master 406 Reputation points

2025-02-07T11:18:09.2433333+00:00
It's the code that is executed from within the Program.cs (Blazor 8.0)

builder.Services.AddLocalization();
AgaveJoe 29,781 Reputation points

2025-02-07T12:44:39.55+00:00

Order matter as explained in the official documentation.

The first step in troubleshooting is reproducing the unwanted behavior. Here on the forums, we cannot reproduce your unwanted behavior without sample code.

Kuler Master 406

I see nothing wrong with the order, but maybe I am missing something obvious. This is the Program.cs code

var builder = WebApplication.CreateBuilder(args);
builder.Logging.SetMinimumLevel(LogLevel.Warning);
if (builder.Environment.IsDevelopment())
{
    builder.Services.AddServerSideBlazor().AddCircuitOptions(x => x.DetailedErrors = true);
}
else
{
    builder.Services.AddServerSideBlazor();
}
#endregion
// Add services to the container.
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
builder.Services.AddHttpContextAccessor();
builder.Services.AddLocalization();
builder.Services.AddControllers();
builder.Services.AddBlazorBootstrap();
builder.Services.AddScoped<Identity>();
var app = builder.Build();
var supportedCultures = new[] { "de-DE", "en-US" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
// Apply the localization settings before other middlewares.
app.UseRequestLocalization(localizationOptions);
app.UseMiddleware<LocalizationMiddleware>();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
    
    app.UseRewriter(new RewriteOptions().AddRedirectToNonWwwPermanent().AddRedirectToHttps());
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseAntiforgery();
app.MapControllers();
app.MapRazorComponents<App>().AddInteractiveServerRenderMode();
app.Run();

Thank you!

Jalpa Panchal-MSFT 785 Reputation points Microsoft Vendor

2025-02-10T03:50:52.06+00:00

which language is set to your browser? could you try to add Console.WriteLine(CultureInfo.CurrentCulture.Name); and see which culture is set. i see you have custom middleware could share that code as well. try to add app.UseRequestLocalization() before app.UseMiddleware<LocalizationMiddleware>()
John 20 Reputation points

2025-02-10T16:49:59.6566667+00:00

I think the language that is set on the browser will load the corresponding culture (if defined). That's based on my experience, had the same issue.
John 20 Reputation points

2025-02-10T16:52:28.0766667+00:00

(sorry double)

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Set default culture

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