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

using System.Net;

string host = Dns.GetHostName();
IPHostEntry ip = Dns.GetHostEntry(host);
Console.WriteLine(ip.AddressList[0].ToString());

刚在我的机器上测试过了,还能用。

其他回答

为了找到IP地址列表,我已经使用了这个解决方案

public static IEnumerable<string> GetAddresses()
{
    var host = Dns.GetHostEntry(Dns.GetHostName());
    return (from ip in host.AddressList where ip.AddressFamily == AddressFamily.lo select ip.ToString()).ToList();
}

但我个人喜欢下面的解决方案,以获得本地有效的IP地址

public static IPAddress GetIPAddress(string hostName)
{
    Ping ping = new Ping();
    var replay = ping.Send(hostName);

    if (replay.Status == IPStatus.Success)
    {
        return replay.Address;
    }
    return null;
 }

public static void Main()
{
    Console.WriteLine("Local IP Address: " + GetIPAddress(Dns.GetHostName()));
    Console.WriteLine("Google IP:" + GetIPAddress("google.com");
    Console.ReadLine();
}
using System.Net;

string host = Dns.GetHostName();
IPHostEntry ip = Dns.GetHostEntry(host);
Console.WriteLine(ip.AddressList[0].ToString());

刚在我的机器上测试过了,还能用。

如果你在内部网络中运行,你将能够获得本地机器的IP地址,如果不是,你将获得外部IP地址: 网络:

//this will bring the IP for the current machine on browser
System.Web.HttpContext.Current.Request.UserHostAddress

桌面:

//This one will bring all local IPs for the desired namespace
IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());
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");
    }

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。