解决“请求的名称有效并且在数据库中找到，但是它没有相关的正确的数据来被解析”

      最近在调试程序的时候报SocketException, Message为“请求的名称有效并且在数据库中找到，但是它没有相关的正确的数据来被解析”。此时感到异常疑惑，以为之前一直用Console做测试是没有问题的，但是把代码转移到ActiveX控件就报错了。

原始代码如下

        private static Socket ConnectSocket(string server, int port)
        {
            Socket s = null;
            IPHostEntry hostEntry = null;

            // Get host related information.
            hostEntry = Dns.GetHostEntry(server);

            // Loop through the AddressList to obtain the supported AddressFamily. This is to avoid
            // an exception that occurs when the host IP Address is not compatible with the address family
            // (typical in the IPv6 case).
            foreach (IPAddress address in hostEntry.AddressList)
            {
                IPEndPoint ipe = new IPEndPoint(address, port);
                Socket tempSocket =
                    new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

                tempSocket.Connect(ipe);

                if (tempSocket.Connected)
                {
                    s = tempSocket;
                    break;
                }
                else
                {
                    continue;
                }
            }
            return s;
        }

 

在Dns.GetHostEntry(server)时候报错。我怀疑是控件在运行时解析有问题。所以换种方法实现

        private static Socket ConnectSocket(string server, int port)
        {
            var bArr = new List<byte>();
            foreach(var c in server.Split('.'))
            {
                bArr.Add(Convert.ToByte(c));
            }

            IPEndPoint ipe = new IPEndPoint(new IPAddress(bArr.ToArray()), port);
            Socket tempSocket =
                new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

            tempSocket.Connect(ipe);

            if (tempSocket.Connected)
            {
                s = tempSocket;
            }

            return s;
        }

 

问题解决了