UWP 应用未从本地主机上的 .NET 桌面应用接收 UDP 数据报

UWP app doesn#39;t receive UDP Datagram from a .NET desktop app on localhost(UWP 应用未从本地主机上的 .NET 桌面应用接收 UDP 数据报)

问题描述

我一直在尝试在作为客户端的 UWP 应用和作为服务器的 .NET 桌面应用之间设置客户端服务器.我使用 UDP 数据报作为两者之间的消息传递系统.

I've been trying to setup a client server between a UWP app as the client and a .NET desktop app as the server. I'm using UDP Datagrams as the messaging system between the two.

这是我的 UWP 代码，用于在端口 22222 的 localhost IP 上侦听数据报:

Here my UWP code to listen for Datagrams on the localhost IP at port 22222:

private async void listenToServer()
{
    // Setup UDP Listener
    socketListener = new DatagramSocket();
    socketListener.MessageReceived += MessageReceived;

    await socketListener.BindEndpointAsync(new HostName("127.0.0.1"),"22222");
    Debug.WriteLine("Listening: " + socketListener.Information.LocalAddress + " " + socketListener.Information.LocalPort);
 }

private async void MessageReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
{
    // Interpret the incoming datagram's entire contents as a string.
    uint stringLength = args.GetDataReader().UnconsumedBufferLength;
    string receivedMessage = args.GetDataReader().ReadString(stringLength);
    Debug.WriteLine("Received " + receivedMessage);
}

这是我的 WinForm .NET 桌面应用程序，用于在 localhost 的 2222 端口上发送数据报:

Here is my WinForm .NET desktop app to send Datagrams on localhost on port 2222:

public async void sendToClient()
{
    // Setup UDP Talker
    talker = new UdpClient();
    sending_end_point = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 22222);
    talker.Connect(sending_end_point);

    byte[] send_buffer = Encoding.ASCII.GetBytes("Hello!");
    await talker.SendAsync(send_buffer, send_buffer.Length);
}

这是我尝试过的，以及我从故障排除中了解到的:

1. 将 UDP 数据报从 UWP 发送到 .NET 桌面可行.

1. Sending a UDP datagram from UWP to .NET desktop works.

通过 localhost 端口 11111 向 .NET 桌面发送消息的 UWP 代码:

UWP code to send message to .NET desktop over localhost port 11111:

public async void sendToServer()
{
    // Connect to the server
    socketTalker = new DatagramSocket();
    await socketTalker.ConnectAsync(new HostName("127.0.0.1"), "11111");
    Debug.WriteLine("Connected: " + socketTalker.Information.RemoteAddress + " " + socketTalker.Information.RemotePort);

    // Setup Writer
    writer = new DataWriter(socketTalker.OutputStream);
    writer.WriteString("Ping!");

    await writer.StoreAsync();

    writer.DetachStream();
    writer.Dispose();
}

.NET 桌面代码通过相同的 IP 和端口侦听来自 UWP 的消息:

.NET desktop code to listen for message from UWP over same IP and port:

private async Task listenToClient()
{
    // Setup listener
    listener = new UdpClient(11111);
    UdpReceiveResult receiveResult = await listener.ReceiveAsync();
    Debug.WriteLine(" Received: " + Encoding.ASCII.GetString(receiveResult.Buffer));

}