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eriksongerson
Asked:2020-05-20 18:10:58 +0000 UTC2020-05-20 18:10:58 +0000 UTC

C#：IP 地址过滤

  • 772

该程序需要获取您的 IP 地址。我用一个函数来做到这一点：

public static string GetLocalIPAddress()
{
    var host = Dns.GetHostEntry(Dns.GetHostName());
    foreach (var ip in host.AddressList)
    {
        if (ip.AddressFamily == AddressFamily.InterNetwork)
        {
            return ip.ToString();
        }
    }
    return null;
}

但是存在以下问题：如果机器上安装了虚拟网络适配器（例如，来自 VirtualBox），则该函数返回其 ip-address。

有没有办法过滤虚拟适配器？

c#

1 个回答

  1. Best Answer

    添加对 System.Management 的引用并对Win32_NetworkAdapter类使用 WMI 查询，实际接口应具有PhysicalAdapter=true。要获取接口的 GUID，您可以使用NetworkInterface.GetAllNetworkInterfaces(). 像这样的东西：

    using System.Net;
using System.Net.Sockets;
using System.Net.NetworkInformation;
using System.Management;

...

//Определяет, является ли адаптер физическим
public static bool IsAdapterPhysical(string guid)
{
    ManagementObjectCollection mbsList = null;            

    ManagementObjectSearcher mbs = new ManagementObjectSearcher(
    "SELECT PhysicalAdapter FROM Win32_NetworkAdapter WHERE GUID = '" + guid + "'"
    );
    bool res = false;

    using (mbs)
    {
        mbsList = mbs.Get();

        foreach (ManagementObject mo in mbsList)
        {                  
            foreach (var p in mo.Properties)
            {                        
                if (p.Value != null)
                {
                    res = (bool)p.Value;
                    break;
                }
                else res = false;                        
            }                    
        }
        return res;
    }

}

//Получает все локальные IP-адреса
public static List<IPAddress> GetIpAddresses()
{
    List<IPAddress> res = new List<IPAddress>(10);

    var ifs = NetworkInterface.GetAllNetworkInterfaces();

    foreach (var interf in ifs)
    {
        var ipprop=interf.GetIPProperties();
        if (ipprop == null) continue;
        var unicast = ipprop.UnicastAddresses;
        if (unicast == null) continue;

        if (IsAdapterPhysical(interf.Id.ToString()))
        {
            //находим первый Unicast-адрес
            foreach (var addr in unicast)
            {
                if (addr.Address.AddressFamily != AddressFamily.InterNetwork) continue;
                res.Add(addr.Address);
                break;
            }
        }
    }

    return res;
}
    • 2

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