C#修改IP地址

方法一：1、在 “方案總管” 右擊 “引用” 添加 “System.Management” 的引用。
2、添加 “using System.Management;”。 

        static void SetNetworkAdapter()
        {
            ManagementBaseObject inPar = null;
            ManagementBaseObject outPar = null;
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = mc.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                if (!(bool)mo["IPEnabled"])
                    continue;

                //設定ip地址和子網路遮罩
                inPar = mo.GetMethodParameters("EnableStatic");
                inPar["IPAddress"] = new string[] { "192.168.16.248", "192.168.16.249" };// 1.備用 2.IP
                inPar["SubnetMask"] = new string[] { "255.255.255.0", "255.255.255.0" };
                outPar = mo.InvokeMethod("EnableStatic", inPar, null);

                //設定網關地址
                inPar = mo.GetMethodParameters("SetGateways");
                inPar["DefaultIPGateway"] = new string[] { "192.168.16.2", "192.168.16.254" }; // 1.網關;2.備用網關
                outPar = mo.InvokeMethod("SetGateways", inPar, null);

                //設定DNS
                inPar = mo.GetMethodParameters("SetDNSServerSearchOrder");
                inPar["DNSServerSearchOrder"] = new string[] { "211.97.168.129", "202.102.152.3" }; // 1.DNS 2.備用DNS
                outPar = mo.InvokeMethod("SetDNSServerSearchOrder", inPar, null);
                break;
            }
        }

方法二：

using System;
using System.Collections;
using System.Text;
using System.Management;
using System.Text.RegularExpressions;
namespace Kingthy.Windows.IPChanger.Providers
{
    /// <summary>
    /// IPProvider 的摘要說明。
    /// </summary>
    public class IPProvider
    {
        public IPProvider()
        {
            //
            // TODO: 在此處添加建構函式邏輯
            //
        }
        /// <summary>
        /// 設定DNS
        /// </summary>
        /// <param name="dns"></param>
        public static void SetDNS(string[] dns)
        {
            SetIPAddress(null, null, null, dns);
        }
        /// <summary>
        /// 設定網關
        /// </summary>
        /// <param name="getway"></param>
        public static void SetGetWay(string getway)
        {
            SetIPAddress(null, null, new string[] { getway }, null);
        }
        /// <summary>
        /// 設定網關
        /// </summary>
        /// <param name="getway"></param>
        public static void SetGetWay(string[] getway)
        {
            SetIPAddress(null, null, getway, null);
        }
        /// <summary>
        /// 設定IP地址和掩碼
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="submask"></param>
        public static void SetIPAddress(string ip, string submask)
        {
            SetIPAddress(new string[] { ip }, new string[] { submask }, null, null);
        }
        /// <summary>
        /// 設定IP地址，掩碼和網關
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="submask"></param>
        /// <param name="getway"></param>
        public static void SetIPAddress(string ip, string submask, string getway)
        {
            SetIPAddress(new string[] { ip }, new string[] { submask }, new string[] { getway }, null);
        }
        /// <summary>
        /// 設定IP地址，掩碼，網關和DNS
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="submask"></param>
        /// <param name="getway"></param>
        /// <param name="dns"></param>
        public static void SetIPAddress(string[] ip, string[] submask, string[] getway, string[] dns)
        {
            ManagementClass wmi = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = wmi.GetInstances();
            ManagementBaseObject inPar = null;
            ManagementBaseObject outPar = null;
            foreach (ManagementObject mo in moc)
            {
                //如果沒有啟用IP設定的網路裝置則跳過
                if (!(bool)mo["IPEnabled"])
                    continue;
                //設定IP地址和掩碼
                if (ip != null && submask != null)
                {
                    inPar = mo.GetMethodParameters("EnableStatic");
                    inPar["IPAddress"] = ip;
                    inPar["SubnetMask"] = submask;
                    outPar = mo.InvokeMethod("EnableStatic", inPar, null);
                }
                //設定網關地址
                if (getway != null)
                {
                    inPar = mo.GetMethodParameters("SetGateways");
                    inPar["DefaultIPGateway"] = getway;
                    outPar = mo.InvokeMethod("SetGateways", inPar, null);
                }
                //設定DNS地址
                if (dns != null)
                {
                    inPar = mo.GetMethodParameters("SetDNSServerSearchOrder");
                    inPar["DNSServerSearchOrder"] = dns;
                    outPar = mo.InvokeMethod("SetDNSServerSearchOrder", inPar, null);
                }
            }
        }
        /// <summary>
        /// 啟用DHCP伺服器
        /// </summary>
        public static void EnableDHCP()
        {
            ManagementClass wmi = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = wmi.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                //如果沒有啟用IP設定的網路裝置則跳過
                if (!(bool)mo["IPEnabled"])
                    continue;
                //重設DNS為空白
                mo.InvokeMethod("SetDNSServerSearchOrder", null);
                //開啟DHCP
                mo.InvokeMethod("EnableDHCP", null);
            }
        }
        /// <summary>
        /// 判斷是否IP地址格式
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        public static bool IsIPAddress(string ip)
        {
            string[] arr = ip.Split('.');
            if (arr.Length != 4)
                return false;
            string pattern = @"\d{1,3}";
            for (int i = 0; i < arr.Length; i++)
            {
                string d = arr[i];
                if (i == 0 && d == "0")
                    return false;
                if (!Regex.IsMatch(d, pattern))
                    return false;
                if (d != "0")
                {
                    d = d.TrimStart('0');
                    if (d == "")
                        return false;
                    if (int.Parse(d) > 255)
                        return false;
                }
            }
            return true;
        }
    }
}