private void Initialization_Load(object sender, EventArgs e)        {            cboxip.Items.Add("请选择IP地址");            List
     
       str = new List
      
       ();            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[0] == "127" || ipstr[0] == "10" || ipstr[0] == "172")                {                    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 = 0;        }