How do I know which languages the program supports?

[CodingOctocat]

My application supports multi-language switching, but I can't translate all the languages, users or other developers can translate them by themselves and generate xx-YY/app.resource.dll file and put it in the root directory of the application, and I want to be able to fetch the loaded language resource files when the application starts, so that I can select and switch between these languages.

[CodingOctocat]

I found solution from SO:

public static List<CultureInfo> GetAvailableCultures()
{
    var result = new List<CultureInfo>() { new("zh-CN") };

    var rm = new ResourceManager(typeof(Lang));

    var cultures = CultureInfo.GetCultures(CultureTypes.AllCultures);

    foreach (var culture in cultures)
    {
        try
        {
            // Do not use "==", won't work.
            if (culture.Equals(CultureInfo.InvariantCulture))
            {
                continue;
            }

            using var rs = rm.GetResourceSet(culture, true, false);

            if (rs is not null)
            {
                result.Add(culture);
            }
        }
        catch (CultureNotFoundException)
        {
            // NOP.
        }
    }

    return result;
}