AttachmentCollection.cs

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using System.Collections.Generic;
using System.Collections.ObjectModel;
 
namespace System.Net.Mail;
 
public sealed class AttachmentCollection : Collection<Attachment>, IDisposable
{
    private bool _disposed;
 
    internal AttachmentCollection()
    {
    }
 
    public void Dispose()
    {
        if (_disposed)
        {
            return;
        }
        using (IEnumerator<Attachment> enumerator = GetEnumerator())
        {
            while (enumerator.MoveNext())
            {
                Attachment current = enumerator.Current;
                current.Dispose();
            }
        }
        Clear();
        _disposed = true;
    }
 
    protected override void RemoveItem(int index)
    {
        if (_disposed)
        {
            throw new ObjectDisposedException(GetType().FullName);
        }
        base.RemoveItem(index);
    }
 
    protected override void ClearItems()
    {
        if (_disposed)
        {
            throw new ObjectDisposedException(GetType().FullName);
        }
        base.ClearItems();
    }
 
    protected override void SetItem(int index, Attachment item)
    {
        if (_disposed)
        {
            throw new ObjectDisposedException(GetType().FullName);
        }
        if (item == null)
        {
            throw new ArgumentNullException("item");
        }
        base.SetItem(index, item);
    }
 
    protected override void InsertItem(int index, Attachment item)
    {
        if (_disposed)
        {
            throw new ObjectDisposedException(GetType().FullName);
        }
        if (item == null)
        {
            throw new ArgumentNullException("item");
        }
        base.InsertItem(index, item);
    }
}