System.Xml.Serialization.LocalScope.AddToFreeLocals C# (CSharp) Method

        public void AddToFreeLocals(Dictionary<Tuple<Type, string>, Queue<LocalBuilder>> freeLocals)
        {
            foreach (var item in _locals)
            {
                Tuple<Type, string> key = new Tuple<Type, string>(item.Value.LocalType, item.Key);
                Queue<LocalBuilder> freeLocalQueue;
                if (freeLocals.TryGetValue(key, out freeLocalQueue))
                {
                    // Add to end of the queue so that it will be re-used in 
                    // FIFO manner
                    freeLocalQueue.Enqueue(item.Value);
                }
                else
                {
                    freeLocalQueue = new Queue<LocalBuilder>();
                    freeLocalQueue.Enqueue(item.Value);
                    freeLocals.Add(key, freeLocalQueue);
                }
            }
        }
    }