ASP.NET C# How to get user language from header?

Question

Is there any method to get the user language like the following java codes in C#?

request.getHeader("Accept-Language")

Answer 1

You can use Request.UserLanguages. This propery contains a sorted string array of client language preferences MSDN.

You can get the default client language, like this:

var userLanguages = Request.UserLanguages;
var ci = userLanguages.Count() > 0 
    ? new CultureInfo(userLanguages[0])
    : CultureInfo.InvariantCulture;

Answer 2

Extending on @alexmac's answer:

Request.UserLanguages returns an array of language-culture;priority pairs, see Mozilla WebDocs. Split the array items and discard the priority part, then filter for the "*" wildcard. The call to new CultureInfo(cultureName) will raise a CultureNotFoundException if cultureName is not found (was ArgumentEcception prior to .NEt 4), so I enclose it in a try/catch and default to InvariantCulture.

// get the user's language / culture settings from the 'accept-language' request header
var userLanguages = httpContext.Request.UserLanguages
    // split the 'language-culture;priority pair and use only the first part:
    .Select(userLanguageAndCultureWithPriority
        => userLanguageAndCultureWithPriority.Split(';')[0])
    // filter wildcard:
    .Where(userLanguageAndCulture => userLanguageAndCulture != "*")
    .ToArray();

CultureInfo ci;

try
{
    ci = userLanguages?.Count() > 0
        ? new CultureInfo(userLanguages[0])
        : CultureInfo.InvariantCulture;
}
catch (CultureNotFoundException)
{
    ci = CultureInfo.InvariantCulture;
}