C#实现一键换IP、重置DNS、网关及掩码的方法

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;
      }
    }
  }
}