在XP上使用Multicast的C#SocketException

以下C#代码在Vista上正常运行,但在XP上失败:

SocketException:提供了无效的参数.

ErrorCode是10022.

XP上的防火墙已被禁用.

using System;
using System.Net;
using System.Net.Sockets;

public class SocketTest
{
    [STAThread]
    public static void Main()
    {
        MySocket s = new MySocket();

        Console.WriteLine("done");
        Console.ReadLine();
    }

    public class MySocket : Socket
    {
        public const ushort SocketTtl = 4;
        public const string Address = "239.255.255.250";

        public IPAddress IPAddress = IPAddress.Parse(Address);

        public MySocket()
            : base(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp)
        {
            SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
            SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, SocketTtl);

            // This line throws SocketException: An invalid argument was supplied
            // SocketException.ErrorCode: 10022
            SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress));
        }
    }
}

有任何想法吗？

在设置SocketOptionName.AddMembership选项之前,需要将套接字绑定到接口.

编辑:刚刚在MSDN文档中验证了这一点(尽管它只说到NT4):

Windows 98,Windows NT 4.0平台注意:在使用AddMembership作为optionName参数之前,必须调用Bind方法.