如何确认访客所在的国家

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public static string GetISORegionName(HttpRequest request)

{

    var lan = request.UserLanguages.First();

    var cultureInfo = CultureInfo.CreateSpecificCulture(lan);

    var regionInfo = new RegionInfo(cultureInfo.LCID);

    return regionInfo.TwoLetterISORegionName;

}

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public static string GetClientIpAddress(HttpRequest request)

{

    var userHostAddress = request.UserHostAddress;

    var xForwardedFor = request.ServerVariables["X_FORWARDED_FOR"];

    if (string.IsNullOrEmpty(xForwardedFor))

        return userHostAddress;

    var forwardingIps = xForwardedFor.Split(',').ToList();

    return forwardingIps.Any() ? forwardingIps.Last() : userHostAddress;

}

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public static string GetISOCodeByMaxMind(HttpRequest request)

{

    using (var reader = new DatabaseReader(HttpContext.Current.Server.MapPath("~/GeoLite2-Country.mmdb")))

    {

        var ipAddress = GetClientIpAddress(request);

        var country = reader.Country(ipAddress);

        return country.Country.IsoCode;

    }

}