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[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;
}