Language detection

var i18n = new I18NextNet(backend, translator, new ThreadLanguageDetector())
{
    DetectLanguageOnEachTranslation = true
};

CultureInfo.CurrentCulture = new CultureInfo("de-DE");
i18n.T("welcome");      // translated to de-DE without changing i18n.Language

i18n.UseDetectedLanguage();   // sets i18n.Language to the detected language

Language detectors

Detector	Description
DefaultLanguageDetector	Always returns the configured language
ThreadLanguageDetector	Returns CultureInfo.CurrentCulture of the current thread, or FallbackLanguage

With IntegrateToAspNetCore the request culture is detected through the current thread culture, so it works together with UseRequestLocalization.