BetterCms.Module.Pages.Services.DefaultRedirectService.RecursiveCircularLoop C# (CSharp) Method

        private void RecursiveCircularLoop(IList<Redirect> redirects, string redirectUrl, List<Guid> checkedIds, string startPageUrl, string startRedirectUrl)
        {
            var redirectTo = redirects.FirstOrDefault(r => r.PageUrl == redirectUrl);
            if (redirectTo != null)
            {
                if (checkedIds.Contains(redirectTo.Id))
                {
                    var message = PagesGlobalization.SaveRedirect_CircularLoopDetected_Message;
                    var logMessage = string.Format("Cannot save redirect. Circular redirect loop from url {0} to url {1} detected.", startPageUrl, startRedirectUrl);
                    throw new ValidationException(() => message, logMessage);
                }

                checkedIds.Add(redirectTo.Id);
                RecursiveCircularLoop(redirects, redirectTo.RedirectUrl, checkedIds, startPageUrl, startRedirectUrl);
            }
        }