Get IPv4 address from notation (xxx.xxx.xxx.xxx) or hostname - CSharp System.Net

CSharp examples for System.Net:IP Address

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Description

Get IPv4 address from notation (xxx.xxx.xxx.xxx) or hostname

Demo Code

/* Copyright (c) 2010 Michael Lidgren

Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom
the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software./*from  w  w w .j a  v  a 2s  .c  o  m*/

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
using System.Text.RegularExpressions;
using System.Text;
using System.Net.Sockets;
using System.Net.NetworkInformation;
using System.Net;
using System;

public class Main{
        /// <summary>
      /// Get IPv4 address from notation (xxx.xxx.xxx.xxx) or hostname
      /// </summary>
      public static IPAddress Resolve(string ipOrHost)
      {
         if (string.IsNullOrEmpty(ipOrHost))
            throw new ArgumentException("Supplied string must not be empty", "ipOrHost");

         ipOrHost = ipOrHost.Trim();

         IPAddress ipAddress = null;
         if (IPAddress.TryParse(ipOrHost, out ipAddress))
         {
            if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
               return ipAddress;
            throw new ArgumentException("This method will not currently resolve other than ipv4 addresses");
         }

         // ok must be a host name
         IPHostEntry entry;
         try
         {
            entry = Dns.GetHostEntry(ipOrHost);
            if (entry == null)
               return null;

            // check each entry for a valid IP address
            foreach (IPAddress ipCurrent in entry.AddressList)
            {
               if (ipCurrent.AddressFamily == AddressFamily.InterNetwork)
                  return ipCurrent;
            }

            return null;
         }
         catch (SocketException ex)
         {
            if (ex.SocketErrorCode == SocketError.HostNotFound)
            {
               //LogWrite(string.Format(CultureInfo.InvariantCulture, "Failed to resolve host '{0}'.", ipOrHost));
               return null;
            }
            else
            {
               throw;
            }
         }
      }
        /// <summary>
      /// Get IPv4 endpoint from notation (xxx.xxx.xxx.xxx) or hostname and port number
      /// </summary>
      public static IPEndPoint Resolve(string ipOrHost, int port)
      {
         IPAddress adr = Resolve(ipOrHost);
         return new IPEndPoint(adr, port);
      }
}

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