System.Net.StreamFramer.EndReadMessage C# (CSharp) Метод

        public byte[] EndReadMessage(IAsyncResult asyncResult)
        {
            if (asyncResult == null)
            {
                throw new ArgumentNullException(nameof(asyncResult));
            }
            WorkerAsyncResult workerResult = asyncResult as WorkerAsyncResult;

            if (workerResult == null)
            {
                throw new ArgumentException(SR.Format(SR.net_io_async_result, typeof(WorkerAsyncResult).FullName), nameof(asyncResult));
            }

            if (!workerResult.InternalPeekCompleted)
            {
                workerResult.InternalWaitForCompletion();
            }

            if (workerResult.Result is Exception)
            {
                throw (Exception)(workerResult.Result);
            }

            int size = (int)workerResult.Result;
            if (size == -1)
            {
                _eof = true;
                return null;
            }
            else if (size == 0)
            {
                // Empty frame.
                return Array.Empty<byte>();
            }

            return workerResult.Buffer;
        }