C# 正确使用UDP DatagramSocket

在我的基类中，我有以下代码（下面提供的SNIP）用于处理UDP套接字。我正在添加对WinRT的支持（由#defineforWinRT控制）。我的一切都在为.Net工作，但我的WinRT实现出了问题。当我发送数据时，服务器端没有收到数据。知道出了什么问题吗？我在客户端没有看到任何错误，只是服务器上没有显示任何内容。我以类似的方式使用DataWriter成功地使我的TCP套接字类工作

        public UdpSocketClient(IPEndPoint remoteEndPoint, int localPort)
        {
            this.remoteEndPoint = remoteEndPoint;
#if WINRT
            this.socket = new DatagramSocket();
            this.socket.MessageReceived += ReceiveCallback;

            // Bind to any port
            Logger.Debug("{0}: UdpSocketClient created. Binding to port {1}.", this, (localPort == 0) ? "[any]" : localPort.ToString());
            IAsyncAction bindAction = this.socket.BindEndpointAsync(new HostName("localhost"), localPort == 0 ? "0" : localPort.ToString());
            bindAction.AsTask().Wait();
            Logger.Trace("{0}: Bind Complete to port {1}", this, this.socket.Information.LocalServiceName);

            // Get IOutputStream
            Logger.Trace("{0}: Getting output stream to {1}.", this, remoteEndPoint);
            IAsyncOperation<IOutputStream> asyncOutput = this.socket.GetOutputStreamAsync(remoteEndPoint.address, remoteEndPoint.port.ToString());
            asyncOutput.AsTask().Wait();
            Logger.Trace("{0}: Got output stream.", this);

            // Create DataWriter
            dataWriter = new DataWriter(asyncOutput.GetResults());
#else
            ...
#endif
        }


        public void SendBuffer(ByteBuffer buffer, int wait = 0)
        {
#if WINRT
            Logger.Trace("{0}: Sending buffer. Wait = {1}", this, wait);
            for (int i = 0; i < buffer.WriteSize(); i++)
                dataWriter.WriteByte(buffer.Buffer()[i]);
            DataWriterStoreOperation op = dataWriter.StoreAsync();
            if (wait != 0) op.AsTask().Wait(wait);
            else op.AsTask().Wait();
            Logger.Trace("{0}: Sending complete.", this);
#else
        ...
#endif
        }

---

我想出来了。显然它不喜欢我的绑定代码。文档中说您应该能够将null传递到绑定中，但我总是得到一个例外。因此，如果我使用ConnectAsync API，它可以工作：

        public UdpSocketClient(IPEndPoint remoteEndPoint, int localPort)
        {
            this.remoteEndPoint = remoteEndPoint;
#if WINRT
            this.socket = new DatagramSocket();
            this.socket.MessageReceived += ReceiveCallback;

            Logger.Trace("{0}: Connecting to {1}.", this, remoteEndPoint);
            IAsyncAction connectAction = this.socket.ConnectAsync(remoteEndPoint.address, remoteEndPoint.port.ToString());
            connectAction.AsTask().Wait();
            Logger.Trace("{0}: Connect Complete. Status {1}, ErrorCode {2}", this, connectAction.Status, 
                connectAction.ErrorCode != null ? connectAction.ErrorCode.Message : "None");

            dataWriter = new DataWriter(this.socket.OutputStream);
#else
            ...
#endif
        }

---

首先使用数据包嗅探器查看客户端是否真的将数据包发送到网络上。我很确定它没有发送数据包。我运行的是相同的.Net代码，它可以正常工作。

        public UdpSocketClient(IPEndPoint remoteEndPoint, int localPort)
        {
            this.remoteEndPoint = remoteEndPoint;
#if WINRT
            this.socket = new DatagramSocket();
            this.socket.MessageReceived += ReceiveCallback;

            Logger.Trace("{0}: Connecting to {1}.", this, remoteEndPoint);
            IAsyncAction connectAction = this.socket.ConnectAsync(remoteEndPoint.address, remoteEndPoint.port.ToString());
            connectAction.AsTask().Wait();
            Logger.Trace("{0}: Connect Complete. Status {1}, ErrorCode {2}", this, connectAction.Status, 
                connectAction.ErrorCode != null ? connectAction.ErrorCode.Message : "None");

            dataWriter = new DataWriter(this.socket.OutputStream);
#else
            ...
#endif
        }