C# 估计，因为不清楚您的混淆在哪里：一般来说，Rx、TPL、套接字编程或异步编码！我希望该方法读取字节计数字节并返回缓冲区。什么样的变化会导致这种情况发生？在火车上，但尝试将observer.OnNext替换为\u=>observer.OnNext（buffe

---

估计，因为不清楚您的混淆在哪里：一般来说，Rx、TPL、套接字编程或异步编码！我希望该方法读取字节计数字节并返回缓冲区。什么样的变化会导致这种情况发生？在火车上，但尝试将

observer.OnNext

替换为

\u=>observer.OnNext（buffer）

，并将方法返回类型更改为

IObservable

。噢和

Observable。Create

也需要类型为

byte[]

。

    public static IObservable<int> WhenDataReceived(this Socket socket, int byteCount, SocketFlags flags = SocketFlags.None)
    {
        Contract.Requires(byteCount > 0);

        return Observable.Create<int>(
            observer =>
            {
                byte[] buffer = new byte[byteCount];
                int remainder = byteCount;
                bool shutdown = false;

                return Observable.Defer<int>(() =>
                        Task.Factory.FromAsync<int>(socket.BeginReceive(buffer, buffer.Length - remainder, remainder, flags,
                        (result) =>
                        {
                            var read = (int)result.AsyncState;
                            remainder -= read;

                            if (read == 0)
                                shutdown = true;
                        },
                        null), socket.EndReceive).ToObservable())
                    .TakeWhile(_ => remainder > 0 && !shutdown)
                    .TakeLast(1)
                    .Subscribe(
                        observer.OnNext,
                        ex =>
                        {
                            var socketError = ex as SocketException;

                            if (socketError != null
                                && (socketError.SocketErrorCode == SocketError.Disconnecting
                                    || socketError.SocketErrorCode == SocketError.Shutdown))
                            {
                                observer.OnCompleted();
                            }
                            else { observer.OnError(ex); }
                        },
                        observer.OnCompleted);
            });
    }
}

        static IObservable<string> StartClient(this IObserver<ScanInformation> observer, IPAddress ip, int port)
    {
        var client = Observable.Using(
            () => new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp),
            socket =>
            from _ in socket.WhenConnected(ip, port)
            from message in
                (from first in socket.WhenDataReceived(4)
                 let length = BitConverter.ToInt32(first, 0)
                 from message in
                     Observable.If(
                         condition: () => length > 0,
                         thenSource: from second in socket.WhenDataReceived(length)
                                     select Encoding.UTF8.GetString(second, 0, length),
                         elseSource: Observable.Return<string>(null))
                 select message)
                .Repeat()
                .TakeWhile(message => message != null)
            select message);

        return
            client.Do(observer).TakeLast(1);
    }