使用 c# 在 windows 中更改 DNS

Question

为这个混乱道歉，我几天前就开始了，我还在努力学习。 我的代码：

private void button1_Click(object sender, EventArgs e)
        {
            ManagementScope oMs = new ManagementScope();
            ObjectQuery oQuery =
                new ObjectQuery("Select * From Win32_NetworkAdapter");
            ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs, oQuery);
            ManagementObjectCollection oReturnCollection = oSearcher.Get();
            foreach (ManagementObject oReturn in oReturnCollection)
            {
                if (oReturn.Properties["NetConnectionID"].Value != null)
                {
                    // I want the result from this pasted into the "Network Adapter" prompt           
                    Console.WriteLine(oReturn.Properties["NetConnectionID"].Value);
                    // This is probably 100% wrong, sorry.
                    String NetworkAdapter = Console.WriteLine(oReturn.Properties["NetConnectionID"].Value);

                    Process process = new Process();
                    process.StartInfo.FileName = "cmd.exe";
                    process.StartInfo.CreateNoWindow = true;
                    process.StartInfo.RedirectStandardInput = true;
                    process.StartInfo.RedirectStandardOutput = true;
                    process.StartInfo.UseShellExecute = false;
                    process.Start();
                    // I want to insert the Name of a network adapter into this command prompt, but I can't seem to manage it.
                    process.StandardInput.WriteLine("netsh interface ipv4 set dns "NetworkAdapter" static 8.8.8.8");
                    process.StandardInput.WriteLine("netsh interface ipv4 add dns "NetworkAdapter" 8.8.4.4 index=2");
                    process.StandardInput.Flush();
                    process.StandardInput.Close();
                    process.WaitForExit();
                    Console.WriteLine(process.StandardOutput.ReadToEnd());
                    Console.Read();
                }
            }
       }

这个想法是，当我按下按钮时，它会检测我的活动网络适配器名称并通过 cmd.exe 提示将其粘贴到标准 dns 更改中。我开始认为我让自己变得更难了。

感谢您的帮助。

Answer 1

更改 dns 的简短版本：

首先获取网络适配器：

public static NetworkInterface GetActiveEthernetOrWifiNetworkInterface()
{
    var Nic = NetworkInterface.GetAllNetworkInterfaces().FirstOrDefault(
        a => a.OperationalStatus == OperationalStatus.Up &&
        (a.NetworkInterfaceType == NetworkInterfaceType.Wireless80211 || a.NetworkInterfaceType == NetworkInterfaceType.Ethernet) &&
        a.GetIPProperties().GatewayAddresses.Any(g => g.Address.AddressFamily.ToString() == "InterNetwork"));

    return Nic;
}

然后设置DNS：

public static void SetDNS(string DnsString)
{
    string[] Dns = { DnsString };
    var CurrentInterface = GetActiveEthernetOrWifiNetworkInterface();
    if (CurrentInterface == null) return;

    ManagementClass objMC = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection objMOC = objMC.GetInstances();
    foreach (ManagementObject objMO in objMOC)
    {
        if ((bool)objMO["IPEnabled"])
        {
            if (objMO["Caption"].ToString().Contains(CurrentInterface.Description))
            {
                ManagementBaseObject objdns = objMO.GetMethodParameters("SetDNSServerSearchOrder");
                if (objdns != null)
                {
                    objdns["DNSServerSearchOrder"] = Dns;
                    objMO.InvokeMethod("SetDNSServerSearchOrder", objdns, null);
                }
            }
        }
    }
}

然后使用类似的方法：

SetDNS("127.0.0.1");

取消设置 dns 使用：

public static void UnsetDNS()
{
    var CurrentInterface = GetActiveEthernetOrWifiNetworkInterface();
        if (CurrentInterface == null) return;

    ManagementClass objMC = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection objMOC = objMC.GetInstances();
    foreach (ManagementObject objMO in objMOC)
    {
        if ((bool)objMO["IPEnabled"])
        {
            if (objMO["Caption"].ToString().Contains(CurrentInterface.Description))
            {
                ManagementBaseObject objdns = objMO.GetMethodParameters("SetDNSServerSearchOrder");
                if (objdns != null)
                {
                    objdns["DNSServerSearchOrder"] = null;
                    objMO.InvokeMethod("SetDNSServerSearchOrder", objdns, null);
                }
            }
        }
    }
}