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
private static string GetLocalIpAdresse()
{
var host = Dns.GetHostEntry(Dns.GetHostName());
foreach(var ip in host.AddressList)
{
if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
{
return ip.ToString();
}
}
throw new Exception ("No network adapters with an IPv4 address in the system");
}
其他回答
不，这几乎是最好的方法。由于一台机器可能有多个IP地址，您需要迭代它们的集合以找到合适的一个。
编辑:我唯一想改变的是改变这个:
if (ip.AddressFamily.ToString() == "InterNetwork")
:
if (ip.AddressFamily == AddressFamily.InterNetwork)
不需要ToString一个枚举进行比较。
namespace NKUtilities
{
using System;
using System.Net;
using System.Net.Sockets;
public class DNSUtility
{
public static int Main(string [] args)
{
string strHostName = "";
try {
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
{
// Otherwise, get the IP address of the host provided on the command line.
strHostName = args[0];
}
// Then using host name, get the IP address list..
IPHostEntry ipEntry = Dns.GetHostEntry (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;
}
catch(SocketException se)
{
Console.WriteLine("{0} ({1})", se.Message, strHostName);
return -1;
}
catch(Exception ex)
{
Console.WriteLine("Error: {0}.", ex.Message);
return -1;
}
}
}
}
详情请看这里。
你必须记住你的电脑可以有多个IP(实际上它总是这样)-所以你是哪一个。
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;
}
}
}
以最快的方式获取远程ip地址。您必须使用下载程序，或者在您的计算机上创建一个服务器。
使用这段简单代码的缺点:(这是推荐的)是它将花费3-5秒来获取您的远程IP地址，因为web客户端初始化时总是需要3-5秒来检查您的代理设置。
public static string GetIP()
{
string externalIP = "";
externalIP = new WebClient().DownloadString("http://checkip.dyndns.org/");
externalIP = (new Regex(@"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}"))
.Matches(externalIP)[0].ToString();
return externalIP;
}
这是我如何修复它..(第一次仍然需要3-5秒)，但在那之后，它总是会在0-2秒内得到你的远程IP地址，这取决于你的连接。
public static WebClient webclient = new WebClient();
public static string GetIP()
{
string externalIP = "";
externalIP = webclient.DownloadString("http://checkip.dyndns.org/");
externalIP = (new Regex(@"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}"))
.Matches(externalIP)[0].ToString();
return externalIP;
}
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();
