C# UDP守护程序类：引用的对象类型不支持尝试的操作

我正在C#中创建一个UDP守护进程类，在Visual Studio中设置断点后，我看到“所引用的对象类型不支持尝试的操作”。在

this:：ip:：Address:：ScopeId:：base

中。ScopeId引发异常

System.Net.Sockets.SocketException

。错误代码为10045/不支持操作

呼叫代码：

namespace Foo.Tester
{
    class Program
    {
        static void Main(string[] args)
        {
            var TestDaemon = new UDPDaemon();
            TestDaemon.port = 9999;
            TestDaemon.Start();
            ...

UDPDaemon类：

{
    public class UDPDaemon
    {

        public int receivedDataLength; 
        public byte[] data; 
        public IPEndPoint ip; 
        public Socket socket; 
        public IPEndPoint sender;
        public EndPoint Remote; 
        public string raw;
        public int port { get; set; }
        public LogRow row;


        public UDPDaemon() 
        {
            ip = new IPEndPoint(IPAddress.Any, port);
            socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            sender = new IPEndPoint(IPAddress.Any, 0);
            Remote = (EndPoint)(sender);
        }
        public void Start()
        {
            socket.Bind(ip);
            while (true)
            {
                data = new byte[1024];
                receivedDataLength = socket.ReceiveFrom(data, ref Remote);
                raw = Encoding.ASCII.GetString(data, 0, receivedDataLength);
                row = new LogRow(raw);
                //Will eventually move to Queue, but just print it for now
                Console.WriteLine(row.ClientIp);
            }
        }
    }
}

导致此异常的原因是什么？异常的含义是什么

为什么我只在VS中设置断点时才会看到异常

我刚刚开始学习这门语言，所以如果代码中还有什么不对劲的地方，最好知道

---

由于您希望在构造函数内使用端口，因此需要将其作为构造函数参数传递，而不是稍后进行设置，例如：

public class UDPDaemon
{
    public int receivedDataLength; 
    public byte[] data; 
    public IPEndPoint ip; 
    public Socket socket; 
    public IPEndPoint sender;
    public EndPoint Remote; 
    public string raw;
    public int Port { get; private set; }
    public LogRow row;

    public UDPDaemon(int port) 
    {
        Port = port;
        ip = new IPEndPoint(IPAddress.Any, port);
        socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        sender = new IPEndPoint(IPAddress.Any, 0);
        Remote = (EndPoint)(sender);
    }
 ....

---

未在

ip=new IPEndPoint（IPAddress.Any，port）中设置端口这导致了套接字异常，所以这是我缺少的某种基本C#OO概念……啊，我现在明白了，ip是在对象实例的构造过程中分配的，而端口直到之后才分配。