怎么用SetSocketOption函数设置MulticastInterface属性？
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, ？？？);



[解决办法]
int optionValue = (int)IPAddress.HostToNetworkOrder(第几块网卡);
s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, optionValue );