MailAddressCollection.cs

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using System.Collections.Generic;
using System.Collections.ObjectModel;
 
namespace System.Net.Mail;
 
public class MailAddressCollection : Collection<MailAddress>
{
    public void Add(string addresses)
    {
        if (addresses == null)
        {
            throw new ArgumentNullException("addresses");
        }
        if (addresses.Length == 0)
        {
            throw new ArgumentException(System.SR.Format(System.SR.net_emptystringcall, "addresses"), "addresses");
        }
        ParseValue(addresses);
    }
 
    protected override void SetItem(int index, MailAddress item)
    {
        if (item == null)
        {
            throw new ArgumentNullException("item");
        }
        base.SetItem(index, item);
    }
 
    protected override void InsertItem(int index, MailAddress item)
    {
        if (item == null)
        {
            throw new ArgumentNullException("item");
        }
        base.InsertItem(index, item);
    }
 
    internal void ParseValue(string addresses)
    {
        IList<MailAddress> list = MailAddressParser.ParseMultipleAddresses(addresses);
        for (int i = 0; i < list.Count; i++)
        {
            Add(list[i]);
        }
    }
 
    public override string ToString()
    {
        return string.Join(", ", this);
    }
 
    internal string Encode(int charsConsumed, bool allowUnicode)
    {
        string text = string.Empty;
        using IEnumerator<MailAddress> enumerator = GetEnumerator();
        while (enumerator.MoveNext())
        {
            MailAddress current = enumerator.Current;
            text = ((!string.IsNullOrEmpty(text)) ? (text + ", " + current.Encode(1, allowUnicode)) : current.Encode(charsConsumed, allowUnicode));
        }
        return text;
    }
}