C#程序之快速切换IP地址

一般每个人至少有两种使用计算机的环境：单位工作场所和家。如果这两个场景使用计算机都是使用自动获取IP地址的话，那么可以略过这篇文章了。笔者使用的场景是：家里是自动获取IP地址的，而单位里是使用的静态IP地址。在这种情况下，把笔记本带到家中和单位，总要手工设置IP，才能正常使用网络。
看了上面的内容，如果还想要继续往下看的，那么就是跟我的情况相似了。那么就Follow Me!

1.界面如下

2.需要作一下dll引用

3.名称空间引用

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;
using System.IO;
using System.Net;

4.修改按钮代码如下：

ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");ManagementObjectCollection moc = mc.GetInstances();foreach (ManagementObject mo in moc){if ((bool)mo["IPEnabled"]){if (mo["Description"].ToString() == comboBox1.SelectedItem.ToString().Trim()){ManagementBaseObject newIP = mo.GetMethodParameters("EnableStatic");ManagementBaseObject newGateway = mo.GetMethodParameters("SetGateways");ManagementBaseObject newDNS = mo.GetMethodParameters("SetDNSServerSearchOrder");// 将要修改的目标 IP 地址//   string selectNewIP;string IPStr = "";string[] IPPart = ipAdd.Text.Split('.');for (int i = 0; i <= 3; i++){//删除尾部首部的空格IPStr += (IPPart[i].Trim() + ".");}IPStr = IPStr.Substring(0, IPStr.Length - 1);newIP["IPAddress"] = new string[] { IPStr };//设置子网掩码string subStr = "";string[] subPart = subMask.Text.Split('.');for (int i = 0; i <= 3; i++){//删除尾部首部的空格subStr += (subPart[i].Trim() + ".");}subStr = subStr.Substring(0, subStr.Length - 1);newIP["SubnetMask"] = new string[] { subStr };//设置网关地址 string gatStr = "";string[] gatPart = gateWay.Text.Split('.');for (int i = 0; i <= 3; i++){gatStr += (gatPart[i].Trim() + ".");}gatStr = gatStr.Substring(0, gatStr.Length - 1);newGateway["DefaultIPGateway"] = new string[] { gatStr };// 将要修改的目标 DNS 首选地址string dnsStr1 = "";string[] dnsPart1 = DNS1.Text.Split('.');for (int i = 0; i <= 3; i++){dnsStr1 += (dnsPart1[i].Trim() + ".");}dnsStr1 = dnsStr1.Substring(0, dnsStr1.Length - 1);// 将要修改的目标 DNS 备用地址string dnsStr2 = "";if (DNS2.Text.Trim()!=""){string[] dnsPart2 = DNS2.Text.Split('.');for (int i = 0; i <= 3; i++){dnsStr2 += (dnsPart2[i].Trim() + ".");}dnsStr2 = dnsStr2.Substring(0, dnsStr2.Length - 1);newDNS["DNSServerSearchOrder"] = new string[] { dnsStr1, dnsStr2 }; }elsenewDNS["DNSServerSearchOrder"] = new string[] { dnsStr1 }; // 修改网络设置try{ManagementBaseObject setIP = mo.InvokeMethod("EnableStatic", newIP, null);ManagementBaseObject setGateways = mo.InvokeMethod("SetGateways", newGateway, null);ManagementBaseObject setDNS = mo.InvokeMethod("SetDNSServerSearchOrder", newDNS, null);MessageBox.Show("设置成功");}catch (Exception ex){MessageBox.Show(ex.Message);}break;}}}

5.自动获取代码如下

ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");ManagementObjectCollection moc = mc.GetInstances();foreach (ManagementObject mo in moc){if ((bool)mo["IPEnabled"]){if (mo["Description"].ToString() == comboBox1.SelectedItem.ToString().Trim()){//重置DNS为空   mo.InvokeMethod("SetDNSServerSearchOrder", null);//开启DHCP   mo.InvokeMethod("EnableDHCP", null);MessageBox.Show("自动获取IP成功！");break;}}}

6.保存配置文件代码

 try{string path = Application.StartupPath + "\\config.ini";if (File.Exists(path)){File.Delete(path);}using (StreamWriter sw = File.AppendText(path)){sw.WriteLine(ipAdd.Text);sw.WriteLine(subMask.Text);sw.WriteLine(gateWay.Text);sw.WriteLine(DNS1.Text);sw.WriteLine(DNS2.Text);}}catch (Exception ex){MessageBox.Show("写入配置文件错误！" + ex.Message);}

7. 退出代码

 Application.Exit();

8.窗体Load事件代码

string carName = "";ManagementObjectSearcher search = new ManagementObjectSearcher("SELECT * FROM Win32_NetWorkAdapterConfiguration");foreach (ManagementObject sear in search.Get()){if (sear["IPAddress"] != null){carName = sear["Description"].ToString().Trim();comboBox1.Items.Add(carName);}}comboBox1.SelectedIndex = 0;string path=Application.StartupPath+"\\config.ini";if(File.Exists(path)){using (StreamReader sr = File.OpenText(path)){ipAdd.Text = sr.ReadLine();subMask.Text = sr.ReadLine();gateWay.Text = sr.ReadLine();DNS1.Text = sr.ReadLine();DNS2.Text = sr.ReadLine();}}else{ShowInfo();}

9.自定义方法 ShowInfo()

 public void ShowInfo(){ManagementClass myMClass = new ManagementClass("Win32_NetworkAdapterConfiguration");ManagementObjectCollection myMOCollection = myMClass.GetInstances();foreach (ManagementObject MObject in myMOCollection){if (!(bool)MObject["IPEnabled"])continue;string[] strIP = (string[])MObject["IPAddress"];            //获取IP地址string[] strSubnet = (string[])MObject["IPSubnet"];         //获取子网掩码string[] strGateway = (string[])MObject["DefaultIPGateway"];//获取默认网关string[] strDns = (string[])MObject["DNSServerSearchOrder"];//获取DNS服务器ipAdd.Text = "";//显示IP地址foreach (string ip in strIP){IPAddress ipaddress = IPAddress.Parse(ip);if (ipaddress.AddressFamily.ToString() != "InterNetwork")continue;if (ipAdd.Text.Trim() != ""){ipAdd.Text += "," + ip;}else{ipAdd.Text = ip;}}subMask.Text = "";//显示子网掩码foreach (string subnet in strSubnet){if (subnet.IndexOf('.') <= 0)continue;if (subMask.Text.Trim() != ""){subMask.Text += "," + subnet;}else{subMask.Text = subnet;}}gateWay.Text = "";//显示默认网关foreach (string gateway in strGateway){IPAddress ipaddress = IPAddress.Parse(gateway);if (ipaddress.AddressFamily.ToString() != "InterNetwork")continue;if (gateWay.Text.Trim() != ""){gateWay.Text += "," + gateway;}else{gateWay.Text = gateway;}}try{//显示DNS服务器for (int i = 0; i < strDns.Length; i++){if (i == 0)DNS1.Text = strDns[i];elseDNS2.Text = strDns[i];}}catch { }}}

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