gistfile1.cs

 private void UpdateRequestsList()
        {
            //為了確認舊的Request是否有部屬過了，避免記憶體濫用
            if (transferRequests != null)
            {
                foreach (var request in transferRequests)
                {
                    request.Dispose();
                }
            }
            //沒被部屬過才啟用Service
            transferRequests = BackgroundTransferService.Requests;
        }