c#網路通訊

   //網路部分
    public class GF_Network
    {
/*
         *         *          * 
*/


/// <summary>
/// 擷取IP地址 返回第一個
/// </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 區域網路用200,廣域網路用2000
/// </summary>
/// <param name="ip">IP地址</param>
/// <param name="timeout">逾時 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>
/// 判讀是否是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;
            }
        }


    }