System.Net.WebSockets.ManagedWebSocket.ReceiveAsync C# (CSharp) Method

        public override Task<WebSocketReceiveResult> ReceiveAsync(ArraySegment<byte> buffer, CancellationToken cancellationToken)
        {
            WebSocketValidate.ValidateArraySegment(buffer, nameof(buffer));

            try
            {
                ClientWebSocket.ThrowIfInvalidState(_state, _disposed, s_validReceiveStates);

                Debug.Assert(!Monitor.IsEntered(StateUpdateLock), $"{nameof(StateUpdateLock)} must never be held when acquiring {nameof(ReceiveAsyncLock)}");
                lock (ReceiveAsyncLock) // synchronize with receives in CloseAsync
                {
                    ThrowIfOperationInProgress(_lastReceiveAsync);
                    Task<WebSocketReceiveResult> t = ReceiveAsyncPrivate(buffer, cancellationToken);
                    _lastReceiveAsync = t;
                    return t;
                }
            }
            catch (Exception exc)
            {
                return Task.FromException<WebSocketReceiveResult>(exc);
            }
        }