public override LanguageCollection GetLanguages(CallContext context)
{
#if DEBUG
var timer = Stopwatch.StartNew();
#endif
var languages = ReadOnlyProviders.SelectMany(x => x.GetLanguages() ?? EmptyLanguages);
var headLanguages = HeadProvider.GetLanguages(context);
if (headLanguages != null)
{
languages = languages.Concat(headLanguages);
}
languages = languages
.GroupBy(x => x.Name).Select(x => x.First()) // .Distinct()
.OrderByDescending(x => x.Name == "en"); // en must go first
#if DEBUG
this.Trace(languages, timer, context);
#endif
return(new LanguageCollection(languages));
}