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 Parse() and/or TryParse() method but there isn't.

I can split the string on the : and parse an IP address and a port.

But is there a more elegant way?

Answer 1

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 2

I had the requirement of parsing an IPEndpoint with IPv6, v4 and hostnames. The solution I wrote is listed below:

    public static IPEndPoint Parse(string endpointstring)     {         return Parse(endpointstring, -1);     }      public static IPEndPoint Parse(string endpointstring, int defaultport)     {         if (string.IsNullOrEmpty(endpointstring)             || endpointstring.Trim().Length == 0)         {             throw new ArgumentException("Endpoint descriptor may not be empty.");         }          if (defaultport != -1 &&             (defaultport < IPEndPoint.MinPort             || defaultport > IPEndPoint.MaxPort))         {             throw new ArgumentException(string.Format("Invalid default port '{0}'", defaultport));         }          string[] values = endpointstring.Split(new char[] { ':' });         IPAddress ipaddy;         int port = -1;          //check if we have an IPv6 or ports         if (values.Length <= 2) // ipv4 or hostname         {             if (values.Length == 1)                 //no port is specified, default                 port = defaultport;             else                 port = getPort(values[1]);              //try to use the address as IPv4, otherwise get hostname             if (!IPAddress.TryParse(values[0], out ipaddy))                 ipaddy = getIPfromHost(values[0]);         }         else if (values.Length > 2) //ipv6         {             //could [a:b:c]:d             if (values[0].StartsWith("[") && values[values.Length - 2].EndsWith("]"))             {                 string ipaddressstring = string.Join(":", values.Take(values.Length - 1).ToArray());                 ipaddy = IPAddress.Parse(ipaddressstring);                 port = getPort(values[values.Length - 1]);             }             else //[a:b:c] or a:b:c             {                 ipaddy = IPAddress.Parse(endpointstring);                 port = defaultport;             }         }         else         {             throw new FormatException(string.Format("Invalid endpoint ipaddress '{0}'", endpointstring));         }          if (port == -1)             throw new ArgumentException(string.Format("No port specified: '{0}'", endpointstring));          return new IPEndPoint(ipaddy, port);     }      private static int getPort(string p)     {         int port;          if (!int.TryParse(p, out port)          || port < IPEndPoint.MinPort          || port > IPEndPoint.MaxPort)         {             throw new FormatException(string.Format("Invalid end point port '{0}'", p));         }          return port;     }      private static IPAddress getIPfromHost(string p)     {         var hosts = Dns.GetHostAddresses(p);          if (hosts == null || hosts.Length == 0)             throw new ArgumentException(string.Format("Host not found: {0}", p));          return hosts[0];     } 

This has been tested to work with the following examples:

• 0.0.0.0:100
• 0.0.0.0
• [::1]:100
• [::1]
• ::1
• [a:b:c:d]
• [a:b:c:d]:100
• example.org
• example.org:100