C#获取本地IP和外网IP的方法[含ipv4和ipv6]
  

获取本机的IP地址集合:

///
        /// 获取本机所有ip地址
        /// 
        ///"InterNetwork":ipv4地址,"InterNetworkV6":ipv6地址
        /// ip地址集合
        public static List GetLocalIpAddress(string netType)
        {
            string hostName = Dns.GetHostName();//获取主机名称  
            IPAddress[] addresses = Dns.GetHostAddresses(hostName); //解析主机IP地址  

            List IPList = new List();
            if (netType==string.Empty)
            {
                for (int i = 0; i < addresses.Length; i++)
                {
                    IPList.Add(addresses[i].ToString());
                }
            }
            else
            {
                //AddressFamily.InterNetwork表示此IP为IPv4,
                //AddressFamily.InterNetworkV6表示此地址为IPv6类型
                for (int i = 0; i < addresses.Length; i++)
                {
                    if (addresses[i].AddressFamily.ToString() == netType)
                    {
                        IPList.Add(addresses[i].ToString());
                    }
                }
            }
            return IPList;
        }

List ips= GetLocalIpAddress("");//获取本地所有ip
List ipv4_ips = GetLocalIpAddress("InterNetwork");//获取ipv4类型的ip
List ipv6_ips = GetLocalIpAddress("InterNetworkV6");//获取ipv6类型的ip

2、获取本机局域网内IP地址:
如果本机在局域网内,直接调用上面的方法即可,以ipv4为例:

List ipv4_ips = GetLocalIpAddress("InterNetwork");

如果本机只有一个网卡,且没有安装虚拟网卡,那么ipv4_ips里应该只有一条数据,即局域网内地址;

3、获取本机的公网IP地址:
1)、如果本机是拨号上网的或具有独立公网IP的情况下,使用上面的方法即可,以ipv4为例:

List ipv4_ips = GetLocalIpAddress("InterNetwork");

如果本机只有一个网卡,且没有安装虚拟网卡,那么ipv4_ips里应该只有一条数据,即公网IP地址;

2)、如果是路由上网的,想获取网关的外网IP,只能通过访问一些公网的地址来获取外网IP了;
步骤:先获取到含有本机外网ip的页面信息,再通过正则获取到ip信息;


///
        /// 获取页面html
        /// 
        ///请求的地址
        ///编码方式
        /// 
        public static string HttpGetPageHtml(string url, string encoding)
        {
            string pageHtml = string.Empty;
            try
            {
                using (WebClient MyWebClient = new WebClient())
                {
                    Encoding encode = Encoding.GetEncoding(encoding);
                    MyWebClient.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.84 Safari/537.36");
                    MyWebClient.Credentials = CredentialCache.DefaultCredentials;//获取或设置用于向Internet资源的请求进行身份验证的网络凭据
                    Byte[] pageData = MyWebClient.DownloadData(url); //从指定网站下载数据
                    pageHtml = encode.GetString(pageData);
                }
            }
            catch (Exception e)
            {
                
            }
            return pageHtml;
        }
        ///
        /// 从html中通过正则找到ip信息(只支持ipv4地址)
        /// 
        ///
        /// 
        public static string GetIPFromHtml(String pageHtml)
        {
            //验证ipv4地址
            string reg = @"(?:(?:(25[0-5])|(2[0-4]\d)|((1\d{2})|([1-9]?\d)))\.){3}(?:(25[0-5])|(2[0-4]\d)|((1\d{2})|([1-9]?\d)))";
            string ip = "";
            Match m = Regex.Match(pageHtml, reg);
            if (m.Success)
            {
                ip = m.Value;
            }
            return ip;
        }

可测试的几个地址:


1     var t0_html = HttpGetPageHtml("https://www.ip.cn", "utf-8");
2     var t1_html = HttpGetPageHtml("http://www.ip138.com/ips138.asp", "gbk");
3     var t2_html = HttpGetPageHtml("http://www.net.cn/static/customercare/yourip.asp", "gbk");
4     var t0_ip = GetIPFromHtml(t0_html);// 111.198.29.123
5     var t1_ip = GetIPFromHtml(t1_html);// 111.198.29.123
6     var t2_ip = GetIPFromHtml(t2_html);// 111.198.29.123



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