C#小结之网络

public bool Ping(string ip)        {            int timeout = 1000;            string data = "Test Data!";            System.Net.NetworkInformation.Ping p = new System.Net.NetworkInformation.Ping();            System.Net.NetworkInformation.PingOptions options = new System.Net.NetworkInformation.PingOptions();            options.DontFragment = true; byte[] buffer = Encoding.ASCII.GetBytes(data);            System.Net.NetworkInformation.PingReply reply = p.Send(ip, timeout, buffer, options);            if (reply.Status == System.Net.NetworkInformation.IPStatus.Success) return true; else return false;        }

 /// <summary>        /// 得到本机IP        /// </summary>        private string GetLocalIP()        {            //本机IP地址            string strLocalIP = "";            //得到计算机名            string strPcName = Dns.GetHostName();            //得到本机IP地址数组            IPHostEntry ipEntry = Dns.GetHostEntry(strPcName);            //遍历数组            foreach (var IPadd in ipEntry.AddressList)            {                //判断当前字符串是否为正确IP地址                if (IsRightIP(IPadd.ToString()))                {                    //得到本地IP地址                    strLocalIP = IPadd.ToString();                    //结束循环                    break;                }            }            //返回本地IP地址            return strLocalIP;        }        //得到网关地址        private string GetGateway()        {            //网关地址            string strGateway = "";            //获取所有网卡            NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();            //遍历数组            foreach (var netWork in nics)            {                //单个网卡的IP对象                IPInterfaceProperties ip = netWork.GetIPProperties();                //获取该IP对象的网关                GatewayIPAddressInformationCollection gateways = ip.GatewayAddresses;                foreach (var gateWay in gateways)                {                    //如果能够Ping通网关                    if (IsPingIP(gateWay.Address.ToString()))                    {                        //得到网关地址                        strGateway = gateWay.Address.ToString();                        //跳出循环                        break;                    }                }                //如果已经得到网关地址                if (strGateway.Length > 0)                {                    //跳出循环                    break;                }            }            //返回网关地址            return strGateway;        }        /// <summary>        /// 判断是否为正确的IP地址        /// </summary>        /// <param name="strIPadd">需要判断的字符串</param>        /// <returns>true = 是 false = 否</returns>        public static bool IsRightIP(string strIPadd)        {            //利用正则表达式判断字符串是否符合IPv4格式            if (Regex.IsMatch(strIPadd, "[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}"))            {                //根据小数点分拆字符串                string[] ips = strIPadd.Split('.');                if (ips.Length == 4 || ips.Length == 6)                {                    //如果符合IPv4规则                    if (System.Int32.Parse(ips[0]) < 256 && System.Int32.Parse(ips[1]) < 256 & System.Int32.Parse(ips[2]) < 256 & System.Int32.Parse(ips[3]) < 256)                    //正确                    {                        //if (strIPadd.Substring(0, 7) == "172.16.")                        //{                        return true;                        //}                        //else                        //{                        //    MessageBox.Show("IP必须处于T网状态，为172.16.xxx.xxx", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);                        //    return false;                        //}                    }                    //如果不符合                    else                        //错误                        return false;                }                else                    //错误                    return false;            }            else                //错误                return false;        }        /// <summary>        /// 尝试Ping指定IP是否能够Ping通        /// </summary>        /// <param name="strIP">指定IP</param>        /// <returns>true 是 false 否</returns>        public static bool IsPingIP(string strIP)        {            try            {                //创建Ping对象                Ping ping = new Ping();                //接受Ping返回值                PingReply reply = ping.Send(strIP, 1000);                //Ping通                return true;            }            catch            {                //Ping失败                return false;            }        }