//试图连接Socket.

        static Socket ConnectSocket(string strHostName, int port) {

            Socket socketResult = null; //返回Socket连接的对象.

            IPHostEntry ipHostEntry = Dns.GetHostEntry(strHostName);

            foreach(IPAddress ipAddress in ipHostEntry.AddressList) {  //遍历主机下的所有IP地址.

                IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, port);

                Socket socket = new Socket(ipEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

                socket.Connect(ipEndPoint); //连接.

                if(socket.Connected) {  //判断是否连接到远程.

                    socketResult = socket;

                    break;

                }

            }

            return socketResult;

        }

        //Socket发送连接,返回收到的信息.

        static string SocketSendReceive(string strHostName, int port) {

            string strRequest = "GET/HTTP/1.1\n主机:" + strHostName + "\n连接:关闭\n";    //将发送的字符串.

            byte[] bSend = Encoding.Default.GetBytes(strRequest);   //将发送解析的字节数组.

            Socket socket = ConnectSocket(strHostName, port);

            if(socket == null) return "连接失败";

            byte[] bReceive = new byte[1024];   //存储返回的字符数组.