static async IAsyncEnumerable <IUserMessage> EnumerateMessagesAsync(IMessageChannel channel, [EnumeratorCancellation] CancellationToken cancellationToken = default)
{
await foreach (var page in channel.GetMessagesEnumerable(_loadMessages))
{
foreach (var message in page)
{
if (message is IUserMessage userMessage)
{
yield return(userMessage);
}
}
}
}