C#——获取本机IP

偶尔间用到获取本机IP这个方法，在网上搜集的几种方法分享。

1、

string[] GetLocalIpv4()
  {
  //事先不知道ip的个数，数组长度未知，因此用StringCollection储存
  IPAddress[] localIPs;
  localIPs = Dns.GetHostAddresses(Dns.GetHostName());
  StringCollection IpCollection = new StringCollection();
  foreach (IPAddress ip in localIPs)
  {
  //根据AddressFamily判断是否为ipv4,如果是InterNetWork则为ipv6
  if (ip.AddressFamily == AddressFamily.InterNetwork)
  IpCollection.Add(ip.ToString());
  }
  string[] IpArray = new string[IpCollection.Count];
  IpCollection.CopyTo(IpArray, 0);
  return IpArray;
  }

2、使用IPHostEntry获取本机局域网地址

1         static string GetLocalIp() 2  { 3             string hostname = Dns.GetHostName();//得到本机名 4             //IPHostEntry localhost = Dns.GetHostByName(hostname);//方法已过期，只得到IPv4的地址  

5             <SPAN style="WHITE-SPACE: pre"> </SPAN>    

              IPHostEntry localhost = Dns.GetHostEntry(hostname); 6             IPAddress localaddr = localhost.AddressList[0]; 7             return localaddr.ToString(); 8         }  

自己亲身试验的是个方法，有点出入，在本机中localhost.AddressList集合中内容如下：

不知道集合中的0、1、3是什么东西，但2是我本机IP.

 3、通过向网站向一些提供IP查询的网站发送webrequest，然后分析返回的数据流 （一些网站是可以查找IP的）

1        string strUrl = "提供IP查询的网站的链接";  2        Uri uri = new Uri(strUrl);  3        WebRequest webreq = WebRequest.Create(uri);  4        Stream s = webreq .GetResponse().GetResponseStream();  5        StreamReader sr = new StreamReader(s, Encoding.Default);  6        string all = sr.ReadToEnd();  7        int i = all.IndexOf("[") + 1;  8        //分析字符串得到IP  9        return ip; 10        /*11  我用的是http://www.ip.cn/getip.php?action=getip&ip_url=&from=web 12  (这种链接很容易找的，百度“IP”得到一些网站，分析一下网站的链接就能得到) 13  返回的数据是： 14  <div class="well"><p>当前 IP：<code>0.0.0.0</code>&nbsp;来自：XX省XX市 电信</p><p>GeoIP: Beijing, China</p></div> 15  解析这段就行 16       */  

4、通过获取CMD里ipconfig命令的结果来得到IP  

1    private void GetIP6()  
 2    {  
 3        Process cmd = new Process();  
 4        cmd.StartInfo.FileName = "ipconfig.exe";//设置程序名    5        cmd.StartInfo.Arguments = "/all";  //参数   
 6 //重定向标准输出    7        cmd.StartInfo.RedirectStandardOutput = true;  
 8        cmd.StartInfo.RedirectStandardInput = true;  
 9        cmd.StartInfo.UseShellExecute = false;  
10        cmd.StartInfo.CreateNoWindow = true;//不显示窗口（控制台程序是黑屏）   
11 //cmd.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;//暂时不明白什么意思   12        /*13 收集一下 有备无患 
14        关于:ProcessWindowStyle.Hidden隐藏后如何再显示？ 
15        hwndWin32Host = Win32Native.FindWindow(null, win32Exinfo.windowsName); 
16        Win32Native.ShowWindow(hwndWin32Host, 1);     //先FindWindow找到窗口后再ShowWindow 
17        */18        cmd.Start();  
19        string info = cmd.StandardOutput.ReadToEnd();  
20        cmd.WaitForExit();  
21        cmd.Close();  
22        textBox1.AppendText(info);  
23    }

5、 由于用到了ManagementClass、ManagementObjectCollection；必须添加引用System.Management.dll及using System.Management;

 private void GetIP()
         {
             string stringMAC = "";
             string stringIP = "";
             ManagementClass managementClass = new ManagementClass("Win32_NetworkAdapterConfiguration");
             ManagementObjectCollection managementObjectCollection = managementClass.GetInstances();
             foreach(ManagementObject managementObject in managementObjectCollection)
             {
                 if ((bool)managementObject["IPEnabled"] == true)
                 {
                     stringMAC += managementObject["MACAddress"].ToString();
                     string[] IPAddresses = (string[])managementObject["IPAddress"];
                     if (IPAddresses.Length > 0)
                     {
                         stringIP = IPAddresses[0];
                     }
                 }
             }
             txtMAC.Text = stringMAC.ToString();
             txtIP.Text = stringIP.ToString();
         }

6、NetworkInformation

 private void GetIP()
        {
     //需要的命名空间
            //using System.Net.NetworkInformation;
            //using System.Net.Sockets;
            string str = "";
            NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
            int i = 0;
            foreach (NetworkInterface adapter in adapters)
            {

                IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
                UnicastIPAddressInformationCollection allAddress =
                                                                                        adapterProperties.UnicastAddresses;
                if (allAddress.Count > 0)
                {
                    str += "interface   " + i + "description:\n\t " + adapter.Description + "\n ";
                    i++;
                    foreach (UnicastIPAddressInformation addr in allAddress)
                    {
                        if (addr.Address.AddressFamily == AddressFamily.InterNetworkV6)
                        {
                            ipListComb.Items.Add(addr.Address);
                        }
                        if (addr.Address.AddressFamily == AddressFamily.InterNetwork)
                        {
                            comboBox1.Items.Add(addr.Address);
                        }

                    }
                }
            }
            MessageBox.Show(str);
        }

来源：http://blog.csdn.net/frombegintoend/article/details/7713097