我正在运行一个服务器，我想显示我自己的IP地址。
获取计算机自身(如果可能的话，外部)IP地址的语法是什么?
有人编写了以下代码。
IPHostEntry host;
string localIP = "?";
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily.ToString() == "InterNetwork")
{
localIP = ip.ToString();
}
}
return localIP;
然而，我通常不信任作者，我不理解这段代码。有更好的方法吗?
当前回答
另一种获取公共IP地址的方法是使用OpenDNS的resolve1.opendns.com服务器，并将myip.opendns.com作为请求。
在命令行上，这是:
nslookup myip.opendns.com resolver1.opendns.com
或者在c#中使用DNSClient nuget:
var lookup = new LookupClient(new IPAddress(new byte[] { 208, 67, 222, 222 }));
var result = lookup.Query("myip.opendns.com", QueryType.ANY);
这比敲击http端点并解析响应要简洁一些。
其他回答
WebClient webClient = new WebClient();
string IP = webClient.DownloadString("http://myip.ozymo.com/");
使用LINQ获取所有IP地址为字符串:
using System.Linq;
using System.Net.NetworkInformation;
using System.Net.Sockets;
...
string[] allIpAddresses = NetworkInterface.GetAllNetworkInterfaces()
.SelectMany(c=>c.GetIPProperties().UnicastAddresses
.Where(d=>d.Address.AddressFamily == AddressFamily.InterNetwork)
.Select(d=>d.Address.ToString())
).ToArray();
为了过滤掉私人信息…
首先，定义一个扩展方法IsPrivate():
public static class IPAddressExtensions
{
// Collection of private CIDRs (IpAddress/Mask)
private static Tuple<int, int>[] _privateCidrs = new []{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"}
.Select(c=>Tuple.Create(BitConverter.ToInt32(IPAddress
.Parse(c.Split('/')[0]).GetAddressBytes(), 0)
, IPAddress.HostToNetworkOrder(-1 << (32-int.Parse(c.Split('/')[1])))))
.ToArray();
public static bool IsPrivate(this IPAddress ipAddress)
{
int ip = BitConverter.ToInt32(ipAddress.GetAddressBytes(), 0);
return _privateCidrs.Any(cidr=>(ip & cidr.Item2)==(cidr.Item1 & cidr.Item2));
}
}
．.． 然后用它来过滤私人ip:
string[] publicIpAddresses = NetworkInterface.GetAllNetworkInterfaces()
.SelectMany(c=>c.GetIPProperties().UnicastAddresses
.Where(d=>d.Address.AddressFamily == AddressFamily.InterNetwork
&& !d.Address.IsPrivate() // Filter out private ones
)
.Select(d=>d.Address.ToString())
).ToArray();
了解你的公共IP的唯一方法是让别人告诉你;这段代码可以帮助你:
public string GetPublicIP()
{
String direction = "";
WebRequest request = WebRequest.Create("http://checkip.dyndns.org/");
using (WebResponse response = request.GetResponse())
using (StreamReader stream = new StreamReader(response.GetResponseStream()))
{
direction = stream.ReadToEnd();
}
//Search for the ip in the html
int first = direction.IndexOf("Address: ") + 9;
int last = direction.LastIndexOf("</body>");
direction = direction.Substring(first, last - first);
return direction;
}
namespace NKUtilities
{
using System;
using System.Net;
public class DNSUtility
{
public static int Main (string [] args)
{
String strHostName = new String ("");
if (args.Length == 0)
{
// Getting Ip address of local machine...
// First get the host name of local machine.
strHostName = Dns.GetHostName ();
Console.WriteLine ("Local Machine's Host Name: " + strHostName);
}
else
{
strHostName = args[0];
}
// Then using host name, get the IP address list..
IPHostEntry ipEntry = DNS.GetHostByName (strHostName);
IPAddress [] addr = ipEntry.AddressList;
for (int i = 0; i < addr.Length; i++)
{
Console.WriteLine ("IP Address {0}: {1} ", i, addr[i].ToString ());
}
return 0;
}
}
}
也许通过外部IP，您可以考虑(如果您在Web服务器上下文中)使用此方法
Request.ServerVariables["LOCAL_ADDR"];
我也在问你同样的问题，我在这篇stackoverflow的文章中找到了它。
这对我很管用。
