System.Net.WebSockets.WebSocketBase.EnsureKeepAliveOperation C# (CSharp) 메소드

        private void EnsureKeepAliveOperation()
        {
            if (_keepAliveOperation == null)
            {
                lock (_thisLock)
                {
                    if (_keepAliveOperation == null)
                    {
                        WebSocketOperation.SendOperation keepAliveOperation = new WebSocketOperation.SendOperation(this);
                        keepAliveOperation.BufferType = WebSocketProtocolComponent.BufferType.UnsolicitedPong;
                        _keepAliveOperation = keepAliveOperation;
                    }
                }
            }
        }