MailKit IMAP空闲-如何在CountChanged事件中访问'done‘CancellationTokenSource

using System;
using MailKit;
using MailKit.Net.Imap;
using MailKit.Search;
using System.Threading;

class Program
{
    static CancellationTokenSource doneTokenSource;

    static void Main(string[] args)
    {
        using (var client = new ImapClient())
        {
            client.Connect("imap.example.com", 993, true);
            client.Authenticate("username", "password");
            client.Inbox.Open(FolderAccess.ReadOnly);

            doneTokenSource = new CancellationTokenSource();

            client.Inbox.CountChanged += Inbox_CountChanged;

            // Keep the connection alive
            client.Idle(doneTokenSource.Token);

            // Disconnect
            client.Disconnect(true);
        }
    }

    static void Inbox_CountChanged(object sender, EventArgs e)
    {
        var doneToken = doneTokenSource.Token;

        if (doneToken.IsCancellationRequested)
        {
            // Handle cancellation logic
            Console.WriteLine("Cancellation requested. Exiting...");
            return;
        }

        // Handle count changed logic
        Console.WriteLine("New mail count: " + ((ImapFolder)sender).Count);
    }
}