Subtext.Framework.Format.UrlFormats.ShortenUrl C# (CSharp) Method

        public static string ShortenUrl(string url, int max)
        {
            if (url.Length <= max)
                return url;

            // Remove the protocal
            int startIndex = url.IndexOf("://");
            if (startIndex > -1)
                url = url.Substring(startIndex + 3);

            if (url.Length <= max)
                return url;

            // Remove the folder structure
            int firstIndex = url.IndexOf("/") + 1;
            int lastIndex = url.LastIndexOf("/");
            if (firstIndex < lastIndex)
                url = url.Replace(url.Substring(firstIndex, lastIndex - firstIndex), "...");

            if (url.Length <= max)
                return url;

            // Remove URL parameters
            int queryIndex = url.IndexOf("?");
            if (queryIndex > -1)
                url = url.Substring(0, queryIndex);

            if (url.Length <= max)
                return url;

            // Remove URL fragment
            int fragmentIndex = url.IndexOf("#");
            if (fragmentIndex > -1)
                url = url.Substring(0, fragmentIndex);

            if (url.Length <= max)
                return url;

            // Shorten page
            firstIndex = url.LastIndexOf("/") + 1;
            lastIndex = url.LastIndexOf(".");
            if (lastIndex - firstIndex > 10)
            {
                string page = url.Substring(firstIndex, lastIndex - firstIndex);
                int length = url.Length - max + 3;
                if(length<page.Length)//If page length is longer then max length, can not shorten it
                    url = url.Replace(page, "..." + page.Substring(length));
            }

            return url;
        }