如何获得局域网中所有在线计算机的IP?

Question

如题

Answer 1

利用多线程来对每个IP逐个扫描。ComputerAddressInfo cai = new ComputerAddressInfo("192.168.1", 42, 53);Thread thScan = new Thread(new ThreadStart(cai.ScanComputers));
thScan.Start();//... public class ComputerAddressInfo
{
    private int startIP = 0;
    private int endIP = 0;
    private string ipPrefix = "";
    private ArrayList computerList = null;    public ComputerAddressInfo(string ipPrefix, int startIP, int endIP)
    {
        this.startIP = startIP;
        this.endIP = endIP;
        this.ipPrefix = ipPrefix;
        computerList = new ArrayList();
    }    public void ScanComputers()
    {
        for (int i = startIP; i <= endIP; i++)
        {
            string scanIP = ipPrefix + "." + i.ToString();
            IPAddress myScanIP = IPAddress.Parse(scanIP);
            IPHostEntry myScanHost = null;
            string[] arr = new string[2];            try
            {
                myScanHost = Dns.GetHostByAddress(myScanIP);
            }
            catch
            {
                continue;
            }            if (myScanHost != null)
            {
                arr[0] = myScanHost.HostName;
                arr[1] = scanIP;                computerList.Add(arr);
            }
        }
    }
}