System.Runtime.Serialization.ObjectIDGenerator.GetId C# (CSharp) Method

        public virtual long GetId(object obj, out bool firstTime) { throw null; }
        public virtual long HasId(object obj, out bool firstTime) { throw null; }

        // Schedule an object for later serialization.
        protected virtual long Schedule(Object obj)
        {
            bool firstTime;
            long objID = m_idGenerator.GetId(obj, out firstTime);

            m_objectQueue.Enqueue(obj);
            return(objID);
        }