DnsEndPoint.cs

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using System.Diagnostics.CodeAnalysis;
using System.Net.Sockets;
 
namespace System.Net;
 
public class DnsEndPoint : EndPoint
{
    private readonly string _host;
 
    private readonly int _port;
 
    private readonly AddressFamily _family;
 
    public string Host => _host;
 
    public override AddressFamily AddressFamily => _family;
 
    public int Port => _port;
 
    public DnsEndPoint(string host, int port)
        : this(host, port, AddressFamily.Unspecified)
    {
    }
 
    public DnsEndPoint(string host, int port, AddressFamily addressFamily)
    {
        if (host == null)
        {
            throw new ArgumentNullException("host");
        }
        if (string.IsNullOrEmpty(host))
        {
            throw new ArgumentException(System.SR.Format(System.SR.net_emptystringcall, "host"));
        }
        if (port < 0 || port > 65535)
        {
            throw new ArgumentOutOfRangeException("port");
        }
        if (addressFamily != AddressFamily.InterNetwork && addressFamily != AddressFamily.InterNetworkV6 && addressFamily != 0)
        {
            throw new ArgumentException(System.SR.net_sockets_invalid_optionValue_all, "addressFamily");
        }
        _host = host;
        _port = port;
        _family = addressFamily;
    }
 
    public override bool Equals([NotNullWhen(true)] object? comparand)
    {
        if (!(comparand is DnsEndPoint dnsEndPoint))
        {
            return false;
        }
        if (_family == dnsEndPoint._family && _port == dnsEndPoint._port)
        {
            return _host == dnsEndPoint._host;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return StringComparer.OrdinalIgnoreCase.GetHashCode(ToString());
    }
 
    public override string ToString()
    {
        return _family.ToString() + "/" + _host + ":" + _port;
    }
}