Dictionary<String, AppDomain> listDomain

public void Init(int processQueueInterval = INTERVAL_UNLOAD_DOMAIN)
        {
            //if (string.IsNullOrEmpty(pathToLogFile))
            if (listDomain != null)
                return;

            listDomain = new Dictionary<string, AppDomain>();
            queue = new Queue<String>();

            if (processQueueInterval > 0)
            {
                logQueueThread = new Thread(() =>
                {
                    while (workExists)
                    {
                        Thread.Sleep(processQueueInterval);
                             // Выгрузка домена
                            ProcessQueue();
                    }
                });
                logQueueThread.IsBackground = true;
                logQueueThread.Start();
            }
        }

 Queue<String> queue

private void ProcessQueue()
        {
            bool runGC = queue.Count > 0;
            while (queue.Count > 0)
            {
                String nameDomain = queue.Dequeue();
                if (nameDomain != null)
                {
                    RemoveDomain(nameDomain);
                }
            }

            if ((runGC) && (listDomain.Count == 0))
                GC.Collect(2);
        }

private void RemoveDomain(String nameDomain)
        {
            if (!listDomain.ContainsKey(nameDomain)) return;
            AppDomain.Unload(listDomain[nameDomain]);
            Guid sId = Guid.Empty;
            Guid.TryParse(nameDomain, out sId);
            Log.WriteLog(sId, "DomainManager.RemoveDomain", "Unloaded domain: " + nameDomain, LogWarning.Trace);
            listDomain.Remove(nameDomain);
            workExists = (listDomain.Count != 0);
        }

public void UnloadDomain(String nameDomain)
        {
            lock (lockObj)
            {
                if (queue == null) return;
                Guid sId = GetSid(nameDomain);
                Log.WriteLog(sId, "DomainManager.UnloadDomain", "Поставлен на удаление domain: " + nameDomain, LogWarning.Trace);
                queue.Enqueue(nameDomain);
            }
        }

ProcessQueue()