TcmUri.cs

   public class TcmUri
    {
        public int ItemId { get; set; }
        public int PublicationId { get; set; }
        public int ItemTypeId { get; set; }
        public int Version { get; set; }

        [DebuggerStepThrough]
        public TcmUri(string Uri)
        {
            Regex re = new Regex(@"tcm:(\d+)-(\d+)-?(\d*)-?v?(\d*)");
            Match m = re.Match(Uri);
            if (m.Success)
            {
                PublicationId = Convert.ToInt32(m.Groups[1].Value);
                ItemId = Convert.ToInt32(m.Groups[2].Value);
                if (m.Groups.Count > 3 && !string.IsNullOrEmpty(m.Groups[3].Value))
                {
                    ItemTypeId = Convert.ToInt32(m.Groups[3].Value);
                }
                else
                {
                    ItemTypeId = 16;
                }
                if (m.Groups.Count > 4 && !string.IsNullOrEmpty(m.Groups[4].Value))
                {
                    Version = Convert.ToInt32(m.Groups[4].Value);
                }
                else
                {
                    Version = 0;
                }
            }
        }

        public TcmUri(int PublicationId, int ItemId, int ItemTypeId, int Version)
        {
            this.PublicationId = PublicationId;
            this.ItemId = ItemId;
            this.ItemTypeId = ItemTypeId;
            this.Version = Version;
        }

        public override string ToString()
        {
            if (this.ItemTypeId == 16)
            {
                return string.Format("tcm:{0}-{1}", this.PublicationId, this.ItemId);
            }
            return string.Format("tcm:{0}-{1}-{2}", this.PublicationId, this.ItemId, this.ItemTypeId);
        }

        public static TcmUri NullUri
        {
            get
            {
                return new TcmUri(0, 0, 0, 0);
            }
        }
    }