classe.cs

        public static DocumentReader[] GetReaders()
        {
            var db = new ReaderContainer();
            var readers = new List<DocumentReader>();
            foreach (var document in db.Documents)
            {
                readers.Add(new DocumentReader(document));
            }
            return readers.ToArray();
        }

// SERVICO ANTES
        protected override void OnStart(string[] args)
        {            
            foreach (var documentReader in DocumentReader.GetReaders())
            {               
                var thread = new ThreadStart(documentReader.Read);
                var workerThread = new Thread(thread);
                workers.Add(workerThread);
                workerThread.Start();               
            }
        }


// SERVICO DEPOIS

       protected override void OnStart(string[] args)
        {            

            var db = new ReaderContainer();

            foreach (var document in db.Documents)
            {
                var documentReader = new DocumentReader(document);
                var thread = new ThreadStart(documentReader.Read);
                var workerThread = new Thread(thread);
                workers.Add(workerThread);
                workerThread.Start();               
            }
        }