如何获取默认NIC连接名称

这是一种肮脏的方法,因为它可以通过合并LINQ等进行优化

using System.Net.NetworkInformation;

List<NetworkInterface> Interfaces = new List<NetworkInterface>();
foreach (var nic in NetworkInterface.GetAllNetworkInterfaces())
{
    if (nic.OperationalStatus == OperationalStatus.Up)
    {
        Interfaces.Add(nic);
    }
}


NetworkInterface result = null;
foreach (NetworkInterface nic in Interfaces)
{
    if (result == null)
    {
        result = nic;
    }
    else
    {
        if (nic.GetIPProperties().GetIPv4Properties() != null)
        {
            if (nic.GetIPProperties().GetIPv4Properties().Index < result.GetIPProperties().GetIPv4Properties().Index)
                result = nic;
        }
    }
}

Console.WriteLine(result.Name);

nic.GetIPProperties() nic.GetIPProperties().GetIPv4Properties()

正如其他人所提到的,Windows中没有“默认”NIC适配器。使用的NIC是根据目标网络(地址)和度量选择的。

例如,如果您有两个NIC和两个不同的网络:

  10.1.10.1 - Local Area Connection (metric 20)
  10.1.50.1 - Local Area Connection 2 (metric 10)

你想连接到 10.1.10.15 ,Windows将选择 Local Area Connection 10.1.50.30 ,Windows将选择 Local Area Connection 2 .

现在,如果你尝试连接到 74.125.67.106 (google.com),Windows将选择 因为它的度量值较低。

编辑:这里有一篇很好的文章解释路由- http://www.windowsnetworking.com/articles_tutorials/Making-Sense-Windows-Routing-Tables.html

希望这有帮助。

using System.Linq;
using System.Net.NetworkInformation;

var nic = NetworkInterface
     .GetAllNetworkInterfaces()
     .FirstOrDefault(i => i.NetworkInterfaceType != NetworkInterfaceType.Loopback && i.NetworkInterfaceType != NetworkInterfaceType.Tunnel);
var name = nic.Name;

或更优雅的解决方案:

.Where(i => !(
    new[] { NetworkInterfaceType.Loopback, NetworkInterfaceType.Tunnel }
    .Contains(i.NetworkInterfaceType)))

static IEnumerable<NetworkInterface> GetAllNetworkInterfaces(IEnumerable<NetworkInterfaceType> excludeTypes)
{
    var all = NetworkInterface.GetAllNetworkInterfaces();
    var exclude = all.Where(i => excludeTypes.Contains(i.NetworkInterfaceType));
    return all.Except(exclude);
}

用法:

var nic = GetAllNetworkInterfaces(new[] { NetworkInterfaceType.Tunnel, NetworkInterfaceType.Loopback });

您可以使用WMI类 Win32_NetworkAdapter 枚举所有适配器,它有一个 Index 是默认值,或者其他属性之一可能有助于查找默认值。

可能是这样的:

编辑:修复了损坏的代码(这至少更有可能工作)。但是按照阿巴蒂什切夫说的,我认为你可能需要使用 Win32_NetworkAdapterConfiguration.IPConnectionMetric 要查找默认适配器。。。

ManagementClass mc = new ManagementClass("Win32_NetworkAdapter");
foreach (ManagementObject mo in mc.GetInstances())
{
     int index = Convert.ToInt32(mo["Index"]);
     string name = mo["NetConnectionID"] as string;
     if (!string.IsNullOrEmpty(name))
          textBox1.Text += name + Environment.NewLine;
}

我的一个朋友也有同样的问题。玩了一下c#,我们似乎找到了一种跳过虚拟Ip(不是真正连接的Ip)的方法:我们寻找Gateway,不仅丢弃那些没有虚拟Ip的,还丢弃那些有虚拟Ip(0.0.0.0)的。在我的机器上,最后两个Vm-Ware虚拟适配器。

public static void DisplayIPAddresses()
    {

        Console.WriteLine("\r\n****************************");
        Console.WriteLine("     IPAddresses");
        Console.WriteLine("****************************");


        StringBuilder sb = new StringBuilder();
        // Get a list of all network interfaces (usually one per network card, dialup, and VPN connection)     
        NetworkInterface[] networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();

        foreach (NetworkInterface network in networkInterfaces)
        {

            if (network.OperationalStatus == OperationalStatus.Up )
            {
                if (network.NetworkInterfaceType == NetworkInterfaceType.Tunnel) continue;
                //GatewayIPAddressInformationCollection GATE = network.GetIPProperties().GatewayAddresses;
                // Read the IP configuration for each network   

                IPInterfaceProperties properties = network.GetIPProperties();
                //discard those who do not have a real gateaway 
                if (properties.GatewayAddresses.Count > 0)
                {
                    bool good = false;
                    foreach  (GatewayIPAddressInformation gInfo in properties.GatewayAddresses)
                    {
                        //not a true gateaway (VmWare Lan)
                        if (!gInfo.Address.ToString().Equals("0.0.0.0"))
                        {
                            sb.AppendLine(" GATEAWAY "+ gInfo.Address.ToString());
                            good = true;
                            break;
                        }
                    }
                    if (!good)
                    {
                        continue;
                    }
                }
                else {
                    continue;
                }
                // Each network interface may have multiple IP addresses       
                foreach (IPAddressInformation address in properties.UnicastAddresses)
                {
                    // We're only interested in IPv4 addresses for now       
                    if (address.Address.AddressFamily != AddressFamily.InterNetwork) continue;

                    // Ignore loopback addresses (e.g., 127.0.0.1)    
                    if (IPAddress.IsLoopback(address.Address)) continue;

                    if (!address.IsDnsEligible) continue;
                    if (address.IsTransient) continue; 

                    sb.AppendLine(address.Address.ToString() + " (" + network.Name + ") nType:" + network.NetworkInterfaceType.ToString()     );
                }
            }
        }
        Console.WriteLine(sb.ToString());
    }

您可以得到它们的列表,但不是默认值(也许您可以假设它是第一个条目)。

static void Main(string[] args)
{
  foreach (var nc in NetworkInterface.GetAllNetworkInterfaces())
  {
    Console.WriteLine(nc.Name);
  }

  Console.ReadLine();
}