1  /// 
 2          /// 是否能 Ping 通指定的主机 3          /// 
 4          /// ip 地址或主机名或域名 5          /// 
      
       true 通，false 不通
       6          public bool Ping(string ip) 7          { 8              System.Net.NetworkInformation.Ping p = new System.Net.NetworkInformation.Ping(); 9              System.Net.NetworkInformation.PingOptions options = new System.Net.NetworkInformation.PingOptions();10              options.DontFragment = true;11              string data = "Test Data!";12              byte[] buffer = Encoding.ASCII.GetBytes(data);13              int timeout = 1000; // Timeout 时间，单位：毫秒14              System.Net.NetworkInformation.PingReply reply = p.Send(ip, timeout, buffer, options);15              if (reply.Status == System.Net.NetworkInformation.IPStatus.Success)16                  return true;17              else18                  return false;19          }