IPAddress.Parse() using port on IPv4

Question

I'm trying to parse a string containing an IP address and a port using IPAddress.Parse. This works well with IPv6 addresses but not with IPv4 addresses. Can somone explain why this happens?

The code I'm using is:

IPAddress.Parse("[::1]:5"); //Valid
IPAddress.Parse("127.0.0.1:5"); //null

Answer 1

Uri url;
IPAddress ip;
if (Uri.TryCreate(String.Format("http://{0}", "127.0.0.1:5"), UriKind.Absolute, out url) &&
   IPAddress.TryParse(url.Host, out ip))
{
    IPEndPoint endPoint = new IPEndPoint(ip, url.Port);
}

Answer 2

This happens because the port is not part of the IP address. It belongs to TCP/UDP, and you'll have to strip it out first. The Uri class might be helpful for this.