Surface Controller base class that sets the current culture for the domain

  public class RpSurfaceController : SurfaceController
    {
        
        protected override void Initialize(System.Web.Routing.RequestContext requestContext)
        {
            
            var domains = ApplicationContext.Current.ApplicationCache.RuntimeCache.GetCacheItem<List<DomainInfoDto>>(
                        "GenericTempStore-Domains",
                        () =>
                        {
                            var sql = @"SELECT [domainName],[languageISOCode] FROM [umbracoDomains] as d INNER JOIN [umbracoLanguage] as l on d.[domainDefaultLanguage] = l.[id]";

                            return ApplicationContext.Current.DatabaseContext.Database.Fetch<DomainInfoDto>(sql);
                            
                        });
                        
            if(requestContext?.HttpContext?.Request?.Url != null)
            { 
                var currentUrl = requestContext.HttpContext.Request.Url.AbsoluteUri;

                foreach (var domain in domains)
                {
                    if (currentUrl.StartsWith(domain.DomainName))
                    {
                        System.Threading.Thread.CurrentThread.CurrentUICulture = new CultureInfo(domain.LanguageISOCode);
                    }
                }
            }

            base.Initialize(requestContext);
        }

        public class DomainInfoDto
        {
            public string DomainName { get; set; }
            public string LanguageISOCode { get; set; }

        }

    }