查找用户通过哪个网络设备连接到互联网

Question

使用下面的代码，我将获得机器上启用和运行的所有网络接口。

Private netIntrfc As NetworkInterface() = NetworkInterface.GetAllNetworkInterfaces()
For i As Integer = 0 To netIntrfc.Length - 1
  If netIntrfc(i).OperationalStatus = OperationalStatus.Up Then
    netDevicesList.Items.Add(netIntrfc(i).Name.ToString)
  End If
Next

但我的问题是如何获得默认，即用户连接到互联网的那个（以太网适配器）？

我需要更改默认适配器的一些设置（用户连接到互联网的方式）。我通过注册表更改设置，以便我可以为每个网络接口添加相同的设置，但这可能会导致问题并且毫无意义。

编辑：

现在我已经完成了下面的代码，所以如果这可以帮助其他人，但如果有人有更好的解决方案或更可靠，请发送。

Dim u As UdpClient = New UdpClient(System.Net.Dns.GetHostName, 1)
Dim localAddr As IPAddress = CType(u.Client.LocalEndPoint, IPEndPoint).Address

Private netIntrfc As NetworkInterface() = NetworkInterface.GetAllNetworkInterfaces()
For i As Integer = 0 To netIntrfc.Length - 1
  If netIntrfc(i).OperationalStatus = OperationalStatus.Up Then
    For Each uni As NetworkInformation.UnicastIPAddressInformation In ipProps.UnicastAddresses
      If uni.Address.ToString = localAddr.ToString Then
        netDevicesList.Items.Add("DEFAULT: " & netIntrfc(i).Name.ToString)
        DEFDEVID = netIntrfc(i).Id.ToString
      End If
    Next
    netDevicesList.Items.Add(netIntrfc(i).Name.ToString)
  End If
Next

感谢Thomas-Li和这篇文章

Answer 1

这会给你一些提示吗？

识别活动网络接口

Answer 2

我将你的代码移植到了 c#，希望你不介意

    static void Main(string[] args)
    {
        UdpClient u = new UdpClient(System.Net.Dns.GetHostName(), 1);
        IPAddress localAddr = (u.Client.LocalEndPoint as IPEndPoint).Address;
        NetworkInterface[] netIntrfc  = NetworkInterface.GetAllNetworkInterfaces();
        for (int i = 0; i < netIntrfc.Length - 1; i++)
        {
            if (netIntrfc[i].OperationalStatus == OperationalStatus.Up) 
            {
                IPInterfaceProperties ipProps = netIntrfc[i].GetIPProperties();
                foreach (UnicastIPAddressInformation uni in ipProps.UnicastAddresses) 
                {
                    if (uni.Address.ToString() == localAddr.ToString()) 
                    {
                        Console.WriteLine("DEFAULT: " + netIntrfc[i].Name.ToString());
                        Console.WriteLine(netIntrfc[i].Id.ToString());
                    }
                }
            } 
        }
    }