本文实例实现了C#一键换IP、重置DNS、网关及掩码的功能，具体实现的功能为在程序界面窗口中设置ip地址和子网掩码，设置网关地址，设置DNS，并且在设置过程中程序将判断如果没有启用IP设置的网络设备则跳过，重置DNS为空，并开启DHCP。

主要功能代码如下：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Management;namespace changeIP{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { 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; //设置ip地址和子网掩码 inPar = mo.GetMethodParameters("EnableStatic"); string ip = ""; ip = numericUpDown1.Value.ToString() + "." + numericUpDown2.Value.ToString() + "." + numericUpDown3.Value.ToString() + "." + numericUpDown4.Value.ToString(); inPar["IPAddress"] = new string[] { ip };// 1.备用 2.IP string ym = ""; ym = numericUpDown8.Value.ToString() + "." + numericUpDown7.Value.ToString() + "." + numericUpDown6.Value.ToString() + "." + numericUpDown5.Value.ToString(); inPar["SubnetMask"] = new string[] { ym }; outPar = mo.InvokeMethod("EnableStatic", inPar, null); //设置网关地址 inPar = mo.GetMethodParameters("SetGateways"); string wg = ""; wg = numericUpDown12.Value.ToString() + "." + numericUpDown11.Value.ToString() + "." + numericUpDown10.Value.ToString() + "." + numericUpDown9.Value.ToString(); inPar["DefaultIPGateway"] = new string[] { wg }; // 1.网关;2.备用网关 outPar = mo.InvokeMethod("SetGateways", inPar, null); //设置DNS inPar = mo.GetMethodParameters("SetDNSServerSearchOrder"); string dns1 = numericUpDown16.Value.ToString() + "." + numericUpDown15.Value.ToString() + "." + numericUpDown14.Value.ToString() + "." + numericUpDown13.Value.ToString(); string dns2 = numericUpDown20.Value.ToString() + "." + numericUpDown19.Value.ToString() + "." + numericUpDown18.Value.ToString() + "." + numericUpDown17.Value.ToString(); inPar["DNSServerSearchOrder"] = new string[] { dns1, dns2 }; // 1.DNS 2.备用DNS outPar = mo.InvokeMethod("SetDNSServerSearchOrder", inPar, null); break; } } private void button2_Click(object sender, EventArgs e) { ManagementClass wmi = new ManagementClass("Win32_NetworkAdapterConfiguration"); ManagementObjectCollection moc = wmi.GetInstances(); foreach (ManagementObject mo in moc) { //如果没有启用IP设置的网络设备则跳过 if (!(bool)mo["IPEnabled"]) continue; //重置DNS为空 mo.InvokeMethod("SetDNSServerSearchOrder", null); //开启DHCP mo.InvokeMethod("EnableDHCP", null); } } private void button3_Click(object sender, EventArgs e) { this.Close(); this.Dispose(); } private void Form1_KeyDown(object sender, KeyEventArgs e) { switch (e.KeyCode) { case Keys.F2: button1_Click(sender, e); break; case Keys.F3: button2_Click(sender, e); break; } } }}