如何在C#中处理从IMAP服务器下载电子邮件和附件？

using MailKit.Net.Imap;
using MailKit.Search;
using MailKit;
using MimeKit;

// 连接到IMAP服务器
using (var client = new ImapClient())
{
    client.Connect("imap.example.com", 993, true);
    client.Authenticate("username", "password");

    // 选择收件箱文件夹
    client.Inbox.Open(FolderAccess.ReadOnly);

    // 搜索并下载邮件
    var query = SearchQuery.All;
    var uids = client.Inbox.Search(query);
    foreach (var uid in uids)
    {
        var message = client.Inbox.GetMessage(uid);

        // 处理邮件信息
        Console.WriteLine("Subject: {0}", message.Subject);
        Console.WriteLine("From: {0}", message.From);
        Console.WriteLine("To: {0}", message.To);

        // 下载附件
        foreach (var attachment in message.Attachments.OfType<MimePart>())
        {
            // 处理附件
            Console.WriteLine("Attachment: {0}", attachment.FileName);
            // 保存附件到本地文件系统
            attachment.Save("path/to/save/attachment");
        }
    }

    client.Disconnect(true);
}