MulticastOption.cs

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namespace System.Net.Sockets;
 
public class MulticastOption
{
    private IPAddress _group;
 
    private IPAddress _localAddress;
 
    private int _ifIndex;
 
    public IPAddress Group
    {
        get
        {
            return _group;
        }
        set
        {
            _group = value ?? throw new ArgumentNullException("value");
        }
    }
 
    public IPAddress? LocalAddress
    {
        get
        {
            return _localAddress;
        }
        set
        {
            _ifIndex = 0;
            _localAddress = value;
        }
    }
 
    public int InterfaceIndex
    {
        get
        {
            return _ifIndex;
        }
        set
        {
            if (value < 0 || value > 16777215)
            {
                throw new ArgumentOutOfRangeException("value");
            }
            _localAddress = null;
            _ifIndex = value;
        }
    }
 
    public MulticastOption(IPAddress group, IPAddress mcint)
    {
        if (group == null)
        {
            throw new ArgumentNullException("group");
        }
        if (mcint == null)
        {
            throw new ArgumentNullException("mcint");
        }
        _group = group;
        LocalAddress = mcint;
    }
 
    public MulticastOption(IPAddress group, int interfaceIndex)
    {
        if (group == null)
        {
            throw new ArgumentNullException("group");
        }
        if (interfaceIndex < 0 || interfaceIndex > 16777215)
        {
            throw new ArgumentOutOfRangeException("interfaceIndex");
        }
        _group = group;
        _ifIndex = interfaceIndex;
    }
 
    public MulticastOption(IPAddress group)
    {
        if (group == null)
        {
            throw new ArgumentNullException("group");
        }
        _group = group;
        LocalAddress = IPAddress.Any;
    }
}