一、测试

1、手动修改IP

2、自动获取IP

二、测试平台

操作系统：Windows 7

开发工具：Visual Studio 2022

三、主要代码

1、获取网卡

private void InitalNetworkInterfaceName()
{   
    NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
    foreach (var adapter in adapters)
    {   //添加网卡中的以太网或无线网络类型
        if (adapter.NetworkInterfaceType == NetworkInterfaceType.Ethernet
            || adapter.NetworkInterfaceType == NetworkInterfaceType.Wireless80211)
            Adapter.Items.Add(adapter.Description);
    }
}

使用了NetworkInterface类，获得一个包含网卡各种属性的数组，包括：Description、Id、Name、NetworkInterfaceType、Speed等。

2、读取IP

private void Adapter_SelectedIndexChanged(object sender, EventArgs e)
{   //网卡选择改变，刷新IP数据
    NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
    foreach (var adapter in adapters)
    {  
        if (adapter.Description == (string)Adapter.SelectedItem)
        {
            GateWay.Text = "";//刷新前先清除
            IP.Text = "";  MaskCode.Text = "";
            DNS1.Text = ""; DNS2.Text = "";
            var iP = adapter.GetIPProperties();
            int gateWayNum = iP.GatewayAddresses.Count;//网关(自动1，手动设1，手动不设0)
            var ipcollection = iP.UnicastAddresses;//IP和子网掩码
            int dnsCount = iP.DnsAddresses.Count;//DNS(自动1，手动设两个2，手动设一个1,手动不设3)
            if (gateWayNum == 0) GateWay.Text = "不存在！";
            while (--gateWayNum >= 0)   GateWay.Text = iP.GatewayAddresses[gateWayNum].Address.ToString();
            foreach (var item in ipcollection)
            {
                if (item.Address.AddressFamily == AddressFamily.InterNetwork)
                {   //IPV4过滤
                    IP.Text = item.Address.ToString();  //显示IP
                    MaskCode.Text = item.IPv4Mask.ToString(); //显示子网掩码
                }
            }
            if (0 < dnsCount & dnsCount < 3)
            {
                DNS1.Text = iP.DnsAddresses[0].ToString();//显示DNS1
                if (dnsCount > 1)  DNS2.Text = iP.DnsAddresses[1].ToString();//显示DNS2
                else  DNS2.Text = "不存在！";
            }
            else
            {
                DNS1.Text = "不存在！";
                DNS2.Text = "不存在！";
            }
        }
    }
}

3、手动修改IP

private void Modify_Click(object sender, EventArgs e)
{   
    ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection moc = mc.GetInstances();
    foreach (ManagementObject mo in moc)
    {
        if (!(bool)mo["IPEnabled"])//网卡未启用则不能修改
            continue;
        if (mo["Description"].ToString() == (string)Adapter.SelectedItem)
        {
            if (IP.Text != null)//IP设置
            {
                ManagementBaseObject newIP = mo.GetMethodParameters("EnableStatic");
                newIP["IPAddress"] = new string[] { IP.Text };
                newIP["SubnetMask"] = new string[] { MaskCode.Text };
                mo.InvokeMethod("EnableStatic", newIP, null);
            }
            if (GateWay.Text != null)//网关设置
            {
                ManagementBaseObject newGateway = mo.GetMethodParameters("SetGateways");
                newGateway["DefaultIPGateway"] = new string[] { GateWay.Text };
                mo.InvokeMethod("SetGateways", newGateway, null);
            }
            if (DNS1.Text != null)//DNS设置
            {
                ManagementBaseObject newDNS = mo.GetMethodParameters("SetDNSServerSearchOrder");
                string[] dns = new string[] { DNS1.Text, DNS2.Text };
                newDNS["DNSServerSearchOrder"] = dns;
                mo.InvokeMethod("SetDNSServerSearchOrder", newDNS, null);
            }
            MessageBox.Show("适配器设置完成！", "提示：");
            break;
        }
    }
}

使用了ManagementClass类的GetInstances()方法，获取网卡所有实例。

4、自动获取IP

private void Autoget_Click(object sender, EventArgs e)
{   //自动获取IP
    ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
    ManagementObjectCollection moc = mc.GetInstances();
    foreach (ManagementObject mo in moc)
    {
        if (!(bool)mo["IPEnabled"])
            continue;
        if (mo["Description"].ToString() == (string)Adapter.SelectedItem)
        {
            mo.InvokeMethod("SetDNSServerSearchOrder", null);//重置DNS  
            mo.InvokeMethod("EnableDHCP", null);//开启DHCP  
            MessageBox.Show("已设置为自动获取IP！", "提示：");
            break;
        }
    }
}

5、自动输入掩码

private void MaskCode_Click(object sender, EventArgs e)
{
    if (string.IsNullOrEmpty(MaskCode.Text))  MaskCode.Text = "255.255.255.0";
}

四、完整程序

链接：https://pan.baidu.com/s/1B_OB3fjDvW8gtdVNHx8grQ?pwd=7777

提取码：7777

五、参考文章

https://www.jb51.net/article/67937.htm
https://blog.csdn.net/asdcsj/article/details/49961967
https://blog.csdn.net/qq_42766764/article/details/122730101

本文例程功能简略，多有不足之处，仅供参考。