c#网络通信

   //网络部分
    public class GF_Network
    {
        /*
         *         *          * 
         */


        /// <summary>
        /// 获取IP地址 返回第一个
        /// </summary>
        /// <returns></returns>
        public static string getIP_This()
        {
            IPHostEntry hostInfo = Dns.GetHostEntry(Dns.GetHostName());
            IPAddress[] address = hostInfo.AddressList;
            if (address.Length == 0)
                return "";
            else
                return address[0].ToString();
        }

        /// <summary>
        /// ping IP地址 timeout 局域网用200,广域网用2000
        /// </summary>
        /// <param name="ip">IP地址</param>
        /// <param name="timeout">超时 毫秒</param>
        /// <returns></returns>
        public static bool ping(string ip, int timeout)
        {            
            IPAddress ipadd;
            if (!IPAddress.TryParse(ip, out ipadd))
            {
                return false;   
            }
            Ping pingSender = new Ping();
            PingReply reply = pingSender.Send(ip, timeout, new Byte[] { Convert.ToByte(1) });
            if (reply.Status == IPStatus.Success)
                return true;
            else
                return false;
        }
        /// <summary>
        /// 判读是否是IP地址
        /// </summary>
        /// <param name="in_str"></param>
        /// <returns></returns>
        public static bool IsIPStr(string in_str)
        {
            if (in_str.Replace(".", "").Length != in_str.Length - 3)
                return false;
            try
            {
                IPAddress ip = IPAddress.Parse(in_str);
                return true;
            }
            catch
            {
                return false;
            }
        }

 
    }