苹果过审ipv6问题

　　苹果过审有一项是必须通过ipv6网络测试游戏，一开始的想法是实现两套socket链接，服务器也实现ipv6，后来百度了其实很简单，直接Dns.GetHostAddresses(string hostNameOrAddress)获取链接地址，hostNameOrAddress传域名地址，域名绑定服务器ip就好了，下面是完整代码：　

    /// <summary>
    /// 连接服务器
    /// </summary>
    void ConnectServer(string host, int port) {
        TcpClient client = null;

        //获取远端服务器ip地址
        IPAddress[] address = Dns.GetHostAddresses(host);
        if (address.Length == 0)
        {
            Debug.LogError("address.Length == 0");
            return;
        }

        //判断当前网络是否为ipv6建立不同链接
        if (address[0].AddressFamily == AddressFamily.InterNetworkV6)
        {
            client = new TcpClient(AddressFamily.InterNetworkV6);
        }
        else
        {
            client = new TcpClient(AddressFamily.InterNetwork);
        }

        //建立链接
        client.NoDelay = true;
        try {
            client.BeginConnect(address[0], port, new AsyncCallback(OnConnect), null);
        } catch (Exception e) {
            Close(); Debug.LogError(e.Message);
        }
    }