C#扫描IP

通过Dns类获得本机IP，可能有多个，通过这个得到子网掩码，默认前24位为1

private void IPScan()
{
    string myHostName = Dns.GetHostName();
    IPAddress[] IPList = Dns.GetHostEntry(myHostName).AddressList;
    this.listBox.Items.Add("HostName:"+myHostName);
    for (int i = 0; i < IPList.Length; i++)
    {
        if (IPList[i].AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork) 
        {
            this.listBox.Items.Add(IPList[i].ToString());
            PingIP(IPList[i]);
        }
    }
}

然后把此段类的IP地址通过Ping类都ping一遍，能ping通再通过SendARP获取目的主机的MAC地址

private void PingIP(IPAddress ipa)
{
    byte[] ipByte = ipa.GetAddressBytes();
    string ipComm = ipByte[0] + "." + ipByte[1] + "." + ipByte[2] + ".";
    string pingIP = "";
 
    for (int lastByte = 0; lastByte <= 255; lastByte++)
    {
        Ping ping = new Ping();
        ping.PingCompleted += new PingCompletedEventHandler(PingComplete);
        pingIP = ipComm + lastByte;
        ping.SendAsync(pingIP, 2000, null);
    }
}
 
[DllImport(@"iphlpapi.dll", ExactSpelling = true)]
private static extern int SendARP(int DestIP, int SrcIP, [Out] byte[] pMacAddr, ref int PhyAddrLen);
private void PingComplete(object sender, PingCompletedEventArgs e) 
{
    if (e.Reply.Status == IPStatus.Success)
    {
        IPAddress ip = e.Reply.Address;
        this.listBox.Items.Add("IP:" + ip.ToString());
        byte[] b = new byte[6];
        int len = b.Length;
        int r = SendARP(BitConverter.ToInt32(ip.GetAddressBytes(), 0), 0, b, ref len);
        string mac = BitConverter.ToString(b, 0, 6);
        this.listBox.Items.Add("Mac:" + mac);
    }
}

如果要获取子网掩码，就需要用到命名空间System.Manaement里面的类

ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection nics = mc.GetInstances();
foreach (ManagementObject nic in nics)
{
if (Convert.ToBoolean(nic["ipEnabled"]) == true)
{
string mac = nic["MacAddress"].ToString();//Mac地址
string ip = (nic["IPAddress"] as String[])[0];//IP地址
string ipsubnet = (nic["IPSubnet"] as String[])[0];//子网掩码
string ipgateway = (nic["DefaultIPGateway"] as String[])[0];//默认网关
}
}

这种方式是或得系统进程，从进程里面读取信息
当然，还有一种获得本机IP的方法
更简洁

			string hostName = Dns.GetHostName();
            IPHostEntry iPHostEntry = Dns.GetHostEntry(hostName);
            var addressV = iPHostEntry.AddressList.FirstOrDefault(q => q.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork);
            strin ip = Convert.ToString(addressV);

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