Best way to create IPEndpoint from string

Question

Since IPEndpoint contains a ToString() method that outputs:

10.10.10.10:1010

There should also be

Answer 1

Create an extension method Parse and TryParse. I guess that is more elegant.

Answer 2

This is one solution...

public static IPEndPoint CreateIPEndPoint(string endPoint)
{
    string[] ep = endPoint.Split(':');
    if(ep.Length != 2) throw new FormatException("Invalid endpoint format");
    IPAddress ip;
    if(!IPAddress.TryParse(ep[0], out ip))
    {
        throw new FormatException("Invalid ip-adress");
    }
    int port;
    if(!int.TryParse(ep[1], NumberStyles.None, NumberFormatInfo.CurrentInfo, out port))
    {
        throw new FormatException("Invalid port");
    }
    return new IPEndPoint(ip, port);
}

Edit: Added a version that will handle IPv4 and IPv6 the previous one only handles IPv4.

// Handles IPv4 and IPv6 notation.
public static IPEndPoint CreateIPEndPoint(string endPoint)
{
    string[] ep = endPoint.Split(':');
    if (ep.Length < 2) throw new FormatException("Invalid endpoint format");
    IPAddress ip;
    if (ep.Length > 2)
    {
        if (!IPAddress.TryParse(string.Join(":", ep, 0, ep.Length - 1), out ip))
        {
            throw new FormatException("Invalid ip-adress");
        }
    }
    else
    {
        if (!IPAddress.TryParse(ep[0], out ip))
        {
            throw new FormatException("Invalid ip-adress");
        }
    }
    int port;
    if (!int.TryParse(ep[ep.Length - 1], NumberStyles.None, NumberFormatInfo.CurrentInfo, out port))
    {
        throw new FormatException("Invalid port");
    }
    return new IPEndPoint(ip, port);
}

Answer 3

IPAddress ipAddress = IPAddress.Parse(yourIPAddress);
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, Convert.ToInt16(yourPortAddress));

Answer 4

Here is a very simple solution, it handles both IPv4 and IPv6.

public class IPEndPoint : System.Net.IPEndPoint
{
    public IPEndPoint(long address, int port) : base(address, port) { }
    public IPEndPoint(IPAddress address, int port) : base(address, port) { }

    public static bool TryParse(string value, out IPEndPoint result)
    {
        if (!Uri.TryCreate($"tcp://{value}", UriKind.Absolute, out Uri uri) ||
            !IPAddress.TryParse(uri.Host, out IPAddress ipAddress) ||
            uri.Port < 0 || uri.Port > 65535)
        {
            result = default(IPEndPoint);
            return false;
        }

        result = new IPEndPoint(ipAddress, uri.Port);
        return true;
    }
}

Simply use the TryParse the way you would normally.

IPEndPoint.TryParse("192.168.1.10:80", out IPEndPoint ipv4Result);
IPEndPoint.TryParse("[fd00::]:8080", out IPEndPoint ipv6Result);

Answer 5

using System;
using System.Net;

static class Helper {
  public static IPEndPoint ToIPEndPoint(this string value, int port = IPEndPoint.MinPort) {
    if (string.IsNullOrEmpty(value) || ! IPAddress.TryParse(value, out var address)) 
      return null;
    var offset = (value = value.Replace(address.ToString(), string.Empty)).LastIndexOf(':');
    if (offset >= 0)
      if (! int.TryParse(value.Substring(offset + 1), out port) || port < IPEndPoint.MinPort || port > IPEndPoint.MaxPort)
        return null;
    return new IPEndPoint(address, port);
  }
}

class Program {
  static void Main() {
    foreach (var sample in new [] {
      // See https://docops.ca.com/ca-data-protection-15/en/implementing/platform-deployment/technical-information/ipv6-address-and-port-formats
      "192.168.0.3",
      "fe80::214:c2ff:fec8:c920",
      "10.0.1.53-10.0.1.80",
      "10.0",
      "10/7",
      "2001:0db8:85a3/48",
      "192.168.0.5:10",
      "[fe80::e828:209d:20e:c0ae]:375",
      ":137-139",
      "192.168:1024-65535",
      "[fe80::]-[fe81::]:80"
    }) {
      var point = sample.ToIPEndPoint();
      var report = point == null ? "NULL" : $@"IPEndPoint {{
  Address: {point.Address}
  AddressFamily: {point.AddressFamily}
  Port: {point.Port}
}}";
      Console.WriteLine($@"""{sample}"" to IPEndPoint is {report}
");
    }
  }
}

Answer 6

This is my take on the parsing of an IPEndPoint. Using the Uri class avoids having to handle the specifics of IPv4/6, and the presence or not of the port. You could can modify the default port for your application.

    public static bool TryParseEndPoint(string ipPort, out System.Net.IPEndPoint result)
    {
        result = null;

        string scheme = "iiiiiiiiiaigaig";
        GenericUriParserOptions options =
            GenericUriParserOptions.AllowEmptyAuthority |
            GenericUriParserOptions.NoQuery |
            GenericUriParserOptions.NoUserInfo |
            GenericUriParserOptions.NoFragment |
            GenericUriParserOptions.DontCompressPath |
            GenericUriParserOptions.DontConvertPathBackslashes |
            GenericUriParserOptions.DontUnescapePathDotsAndSlashes;
        UriParser.Register(new GenericUriParser(options), scheme, 1337);

        Uri parsedUri;
        if (!Uri.TryCreate(scheme + "://" + ipPort, UriKind.Absolute, out parsedUri))
            return false;
        System.Net.IPAddress parsedIP;
        if (!System.Net.IPAddress.TryParse(parsedUri.Host, out parsedIP))
            return false;

        result = new System.Net.IPEndPoint(parsedIP, parsedUri.Port);
        return true;
    }