.net - 套接字异常 : Address already in use

Question

我正在尝试通过异步套接字监听器捕获传入的 UDP 数据包

我正在使用这里的代码:http://www.alexthissen.nl/blogs/main/archive/2004/12/26/receiving-udp-messages-using-udpclient-or-socket-classes.aspx

(我也在这里阅读了一个非常好的教程:http://www.winsocketdotnetworkprogramming.com/clientserversocketnetworkcommunication8d.html 与问题无关，只是将其作为一个很好的资源)

但是，我收到以下错误:

SocketException: Address already in use

这是代码:

private Byte[] buffer;

public void StartListening()
{
    int port = 6500; // 'netstat -an' shows this is initially unused
    int bufferSize = 1024;
    buffer = new Byte[bufferSize];
    IPAddress ip = IPAddress.Any; // IPAddress.Parse( "127.0.0.1" );
    IPEndPoint ep = new IPEndPoint(ip, port);
    Socket sock = new Socket(ip.AddressFamily, SocketType.Dgram, ProtocolType.Udp);

    sock.Bind(ep); // 'SocketException: Address already in use'

    sock.BeginReceive(buffer, 0, 1024, SocketFlags.None, new AsyncCallback(this.OnReceive), sock);
}

private void OnReceive(IAsyncResult ar)
{
    Socket s1 = (Socket)ar.AsyncState;
    int x = s1.EndReceive(ar);
    string message = System.Text.Encoding.ASCII.GetString(buffer, 0, x);
    Console.WriteLine(message);
    s1.BeginReceive(buffer, 0, 1024, SocketFlags.None, new AsyncCallback(this.OnReceive), s1);
}   

Answer 1

代码实际上是正确的。

脚本运行了两次。

只提供这个 stub 答案，这样问题就不会被误报为未答复。