Localization and Globalization in ASP.NET Core MVC (.NET 5)

Question

I've been Following this tutorial "https://www.youtube.com/watch?v=Hy9G30nncMM". with my own modifications.

ConfigureServices:

        services.AddLocalization(opt => { opt.ResourcesPath = "Resources"; });
        services.AddMvc().AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
            .AddDataAnnotationsLocalization();
        services.AddControllersWithViews();

Configure:

        var supportedCultures = new[] {"en","ar"};
        var localizationOptions = new RequestLocalizationOptions()
            .SetDefaultCulture(supportedCultures[0])
            .AddSupportedCultures(supportedCultures)
            .AddSupportedUICultures(supportedCultures);

        app.UseRequestLocalization(localizationOptions);

Folder Hierarchy:

Result: Even that i set the default culture to supportedCultures[0] which is "en", the app gets the "ar".

Any Help on this matter would be appreciated. Thanks in Advance.

LazZiya · Accepted Answer · 2021-04-14 06:45:25Z

By default Asp.Net Core uses below RequestCultureProviders in order to detect the request culture:

So, depending on the supported cultures list provided in startup, it will try to match cultures in the list by the request culture in the providers till it find the first match and respond accordingly.

e.g.:

we have en and ar as supported culture list,
we set the ar as DefaultRequestCulture
we did not provide a request culture in the quesry string ?culture=xx

So the localization middleware will first try with query string, but since there is no culture defined there, it will check the next provider CookieRequestCultreProvider (below is a sample culture cookie for TR culture.)

and if there is no culture param in the cookie it will check the last culture provider AcceptedLanguageHeaderRequestCultureProvider which provides a list of accepted cultures.

Below you can see a screenshot of chrome supported cultures list, you may change the order of your browsers cultures and see how it affect the request culture.

If it can't detect the request culture in any of the above providers then it will use the DefaultRequestCulture that has been defined in RequestLocalizationOptions in startup.

In most cases we may insert RouteDataRequestCultureProvider at 0 position to provide culture in the route data, so it will be the first provider to look at during request localization:

services.Configure<RequestLocalizationOptions>(ops =>
{
    // ...
    ops.AddInitialRequestCultureProvider(new RouteDataRequestCultureProvider());
});

or

services.Configure<RequestLocalizationOptions>(ops =>
{
    // ...
    ops.RequestCultureProviders.Insert(0, new RouteDataRequestCultureProvider());
});

Thank Mr. LazZiya for the highlights, you provided information in which i believe is a must to look deep into it.

Yinqiu · Accepted Answer · 2021-04-14 07:05:01Z

You can change your code like below.

 var supportedCultures = new[] { new CultureInfo("en"), new CultureInfo("ar") };

        var localizationOptions = new RequestLocalizationOptions
        {
            SupportedCultures = supportedCultures,
            SupportedUICultures = supportedCultures,
            DefaultRequestCulture = new RequestCulture("en"),
        };

        localizationOptions.RequestCultureProviders.Clear();

        localizationOptions.RequestCultureProviders.Add(new QueryStringRequestCultureProvider() { QueryStringKey = "lang" });

        app.UseRequestLocalization(localizationOptions);

Test result:

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