C# 获取本机的所有ip地址，并过滤内网ip

private void Initialization_Load(object sender, EventArgs e)

        {

            cboxip.Items.Add("请选择IP地址");

            List<string> str = new List<string>();

            string hostName = Dns.GetHostName();//本机名

            //System.Net.IPAddress[] addressList = Dns.GetHostByName(hostName).AddressList;//会警告GetHostByName()已过期，我运行时且只返回了一个IPv4的地址

            System.Net.IPAddress[] addressList = Dns.GetHostAddresses(hostName);//会返回所有地址，包括IPv4和IPv6

            foreach (IPAddress ip in addressList)

            {

                string _temp_ip = ip.MapToIPv4().ToString();

                string[] ipstr = _temp_ip.Split('.');

                if (ipstr[] == "" || ipstr[] == "" || ipstr[] == "")

                {

                    continue;

                }

                else {

                    string temp = str.Where(s => s == _temp_ip).FirstOrDefault();

                    if (temp == null)

                    {

                        str.Add(_temp_ip);

                        cboxip.Items.Add(_temp_ip);

                    }

                }

            }

            cboxip.SelectedIndex = ;

        }