ASPNET Globalization — Internationalization in ASP.NET Core

// Configure localization
builder.Services.AddLocalization(options => options.ResourcesPath = "Resources");
builder.Services.AddControllersWithViews()
    .AddViewLocalization()
    .AddDataAnnotationsLocalization();

builder.Services.Configure<RequestLocalizationOptions>(options =>
{
    var supported = new[] { "en-US", "fr-FR", "de-DE", "es-ES", "ja-JP" };
    options.DefaultRequestCulture = new RequestCulture("en-US");
    options.SupportedCultures = supported;
    options.SupportedUICultures = supported;
});

app.UseRequestLocalization();

// Usage in controller
public class ScanController : ControllerBase
{
    private readonly IStringLocalizer<ScanController> _localizer;
    public ScanController(IStringLocalizer<ScanController> localizer) => _localizer = localizer;

    public IActionResult Index()
    {
        var message = _localizer["ScanCompleted", fileName];
        return Ok(new { message });
    }
}