Question

我尝试使用UWP发送和接收UDP多播地址。它在前几次完美运行，但经过一段时间的发送 - 接收过程，它将锁定接收部分。我从异步方法变为同步方法但仍然相同。即使我实例化新的UDP客户端，端口也会被阻止，直到应用程序重新启动。我做错了什么？

private UdpClient udp; 
//inside main function:
 if (udp == null)
        {
            udp = new UdpClient(new IPEndPoint(IPAddress.Any, portNumber));
            //^the second time this is called, it will complain about port reuse
            udp.Client.ReceiveTimeout = udp.Client.SendTimeout = 3000;
            //udp.Client.SetSocketOption(SocketOptionLevel.Udp, SocketOptionName.ReuseAddress, true);
            //^invalid 
        }

        //await udp.SendAsync(data, data.Length, , portNumber);
        //I changed from async to synchronous in case it was the issue, but no.
        udp.Client.SendTo(data, new IPEndPoint(IPAddress.Parse(ipString), portNumber));
        //the receive used to be async, too
        byte[] receivedByte = new byte[udp.Client.ReceiveBufferSize];
        try
        {
            udp.Client.Receive(receivedByte);
        }
        catch (Exception ex)
        {
            udp.Client.Shutdown(SocketShutdown.Both);
            udp = null; // added these, but port still blocked until restart
        }

我使用的是UWP，类库中有方法不在这里。

Answer 1

将UdpClient放入using（）语句而不是将其声明为私有字段，并通过将其放入短异步方法来限制其范围后，我不再遇到这些问题了。

多个发送/接收后的UDP客户端停止接收并阻塞端口

1 个答案: