C#如何判断同网段计算机是否存在

这个问题很简单

我平时一般是这样处理的

 

try
               {
                    IPHostEntry myHost = Dns.GetHostByAddress(myIp);
                    HostName = myHost.HostName.ToString();

                }
                catch
                {
                    HostName = "";

                }

 

但是这样有个问题，新系统使用环境为Vista Vista内置了防火墙 所以再这样获取主机的姓名了

于是采取了这样的方法，调用系统API获取MAC地址 若存在则确定主机存在：

 

    public class GetMac
    {
        [DllImport("Iphlpapi.dll")]

        private static extern int SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length);

        [DllImport("Ws2_32.dll")]

        private static extern Int32 inet_addr(string ip);

        public static string GetRemoteMac(string clientIP)
        {

            string ip = clientIP;

            Int32 ldest = inet_addr(ip);

            Int64 macinfo = new Int64();

            Int32 len = 6;

            try
            {

                SendARP(ldest, 0, ref macinfo, ref len);

            }

            catch
            {

                return "";

            }

            string originalMACAddress = Convert.ToString(macinfo, 16);

            if (originalMACAddress.Length < 12)
            {

                originalMACAddress = originalMACAddress.PadLeft(12, '0');

            }

            string macAddress;

            if (originalMACAddress != "0000" && originalMACAddress.Length == 12)
            {

                string mac1, mac2, mac3, mac4, mac5, mac6;

                mac1 = originalMACAddress.Substring(10, 2);

                mac2 = originalMACAddress.Substring(8, 2);

                mac3 = originalMACAddress.Substring(6, 2);

                mac4 = originalMACAddress.Substring(4, 2);

                mac5 = originalMACAddress.Substring(2, 2);

                mac6 = originalMACAddress.Substring(0, 2);

                macAddress = mac1 + "-" + mac2 + "-" + mac3 + "-" + mac4 + "-" + mac5 + "-" + mac6;

            }

            else
            {

                macAddress = "";

            }

            return macAddress.ToUpper();

        } 
    }

 

不知道大家有没有别的好点的方法呢？