C#获取局域网主机

C#获取局域网主机

最近在做一个使用MSRDPClient来实现远程桌面功能，需要先判断一下该局域网主机是否在线，所以就需要获取一遍局域网主机。

首先获取本地IP地址，这里需要注意的是，要排除掉虚拟机的IP，实现代码如下：

 public List<string> GetLocalIPs()
{
    List<string> lstIp = new List<string>();
    ManagementClass mcNetworkAdapterConfig = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection moc_NetworkAdapterConfig = mcNetworkAdapterConfig.GetInstances();
    foreach(ManagementObject mo in moc_NetworkAdapterConfig)
    {
        string mServiceName = mo["ServiceName"] as string;
        if (!(bool)mo["IPEnabled"])
        {
            continue;
        }
        mServiceName = mServiceName.ToLower();
        if(mServiceName.Contains("vmnetadapter")
            || mServiceName.Contains("ppoe")
            || mServiceName.Contains("bthpan")
            || mServiceName.Contains("tapvpn")
            || mServiceName.Contains("ndisip")
            || mServiceName.Contains("sinforvnic"))
        {
            continue;
        }
        string mCaption = mo["Caption"] as string;
        string mMACAddress = mo["MACAddress"] as string;
        string[] mIPAddress = mo["IPAddress"] as string[];
        string[] mIPSubnet = mo["IPSubnet"] as string[];
        string[] mDefaultIPGateway = mo["DefaultIPGateway"] as string[];
        string[] mDNSServerSearchOrder = mo["DNSServerSearchOrder"] as string[];

        if(mIPAddress != null)
        {
            foreach(string ip in mIPAddress)
            {
                if(ip != "0.0.0.0")
                {
                    if(IPAddress.TryParse(ip, out IPAddress address))
                    {
                        if(address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)//排除IP6地址，根据实际情况排除
                        {
                            lstIp.Add(ip);
                        }
                    }
                }
            }
        }
        mo.Dispose();

    }
    return lstIp;
}

然后采用Ping主机，查看是否有返回，实现代码如下：

public void GetLANIps()
{
    this.count = 1;
    this.IsOk = false;
    this.IPHosts.Clear();
    string localHostIp = this.LocalIps[0];
    string ipDuan = localHostIp.Remove(localHostIp.LastIndexOf('.'));
    
    byte[] bys = Encoding.UTF8.GetBytes("hello");
    for (int i = 1; i <= 255; i++)
    {
        string pingIp = $"{ipDuan}.{i}";
        Ping ping = new Ping();
        ping.PingCompleted += Ping_PingCompleted;
        ping.SendAsync(pingIp, 200, bys);
    }
}

private void Ping_PingCompleted(object sender, PingCompletedEventArgs e)
{
    if(this.count++ == 255)
    {
        this.IsOk = true;
    }
    if (e.Reply.Status == IPStatus.Success)
    {
        try
        {
            IPHostEntry iPHost = Dns.GetHostEntry(e.Reply.Address);
            this.IPHosts.Add(iPHost);
        }
        catch
        {

        }
    }
}

开个后台线程去获取，这个获取局域网主机不是特别快