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();
}

LINQ解决方案:

Dns.GetHostEntry(Dns.GetHostName()).AddressList.Where(ip => ip.AddressFamily == AddressFamily.InterNetwork).Select(ip => ip.ToString()).FirstOrDefault() ?? ""

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();

清洁和一体解决方案:D

//This returns the first IP4 address or null
return Dns.GetHostEntry(Dns.GetHostName()).AddressList.FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork);

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());

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;
}