Amqp.TaskExtensions.SendAsync C# (CSharp) Метод

        public static async Task SendAsync(this SenderLink sender, Message message)
        {
            DeliveryState txnState = null;
#if NETFX || NETFX40
            txnState = await TaskExtensions.GetTransactionalStateAsync(sender);
#endif
            TaskCompletionSource<object> tcs = new TaskCompletionSource<object>();
            sender.Send(
                message,
                txnState,
                (m, o, s) =>
                {
                    var t = (TaskCompletionSource<object>)s;
                    if (o.Descriptor.Code == Codec.Accepted.Code)
                    {
                        t.SetResult(null);
                    }
                    else if (o.Descriptor.Code == Codec.Rejected.Code)
                    {
                        t.SetException(new AmqpException(((Rejected)o).Error));
                    }
                    else
                    {
                        t.SetException(new AmqpException(ErrorCode.InternalError, o.Descriptor.Name));
                    }
                },
                tcs);

            await tcs.Task;
        }