带有UDPClient.EndReceive和ref远程端点参数的Observable.FromAsyncPattern

Question

我正在学习反应式扩展并试图重新考虑我的一些代码.

UDPClient.EndReceive有一个ref IPEndPoint参数,所以我目前有这个工作:

UdpClient receiverUDP = new UdpClient();
receiverUDP.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
receiverUDP.EnableBroadcast = true;
receiverUDP.Client.ExclusiveAddressUse = false;
receiverUDP.Client.Bind(new IPEndPoint(IPAddress.Any, 1234));

IPEndPoint ep = null;
var async = Observable.FromAsyncPattern<byte[]>(receiverUDP.BeginReceive, (i) => receiverUDP.EndReceive(i, ref ep));
var subscr = async().Subscribe(x => Console.WriteLine(ASCIIEncoding.ASCII.GetString(x)));

如果我的订阅者需要访问远程IPEndPoint怎么办？在我目前的化身中,我正在使用事件,并传回一个包装byte[]和自定义类IPEndPoint.我无法为我的生活,研究如何用Rx做到这一点.

Answer 1

如果您已经为其创建了一个包装器类byte[],IPEndPoint为什么不使用Select以下命令将其作为序列返回:

private IObservable<RemoteData> GetRemoteDataAsync()
{
    return Observable.Defer(() => 
    {
        UdpClient receiverUDP = new UdpClient();
        receiverUDP.Client.SetSocketOption(SocketOptionLevel.Socket, 
            SocketOptionName.ReuseAddress, true);
        receiverUDP.EnableBroadcast = true;
        receiverUDP.Client.ExclusiveAddressUse = false;
        receiverUDP.Client.Bind(new IPEndPoint(IPAddress.Any, 1234));

        IPEndPoint ep = null;
        return Observable.FromAsyncPattern<byte[]>(
                   receiverUDP.BeginReceive, 
                   (i) => receiverUDP.EndReceive(i, ref ep)
               )()
               .Select(bytes => new RemoteData(bytes, ep));
    });
}