实时获取IMAP邮件的新数据

Question

在使用C#的MailKit收取IMAP邮件时，有没有办法实时获取新接收的邮件，我目前的做法是用while一直请求，这样的话不会第一时间获取数据的更新，可能延迟有个10多20秒 可能更多。这是我的一部分代码

```c#
            var today = DateTimeOffset.Now.Date;
            String  mail = "[e-mail]";
            var Query = SearchQuery.DeliveredAfter(today).And(SearchQuery.FromContains( mail));
            String imapServer = "imap.qq.com";
            int port = 993;
            CancellationTokenSource cts = new CancellationTokenSource();
            using (var client = new ImapClient())
            {
                client.Connect(imapServer, port, true);
                client.Authenticate("[e-mail]", "234234214312");
                var inbox = client.Inbox;
                inbox.Open(FolderAccess.ReadOnly); 

                var  Results = inbox.Search( Query);
                foreach (var uid in  Results)
                {
                    var message = inbox.GetMessage(uid);
                    DateTimeOffset sentDate = message.Date;
                     
                    MessageBox.Show("sssss");
                }
            } 

```

Answer 1

让【道友老李】来帮你解答，本回答参考gpt编写，并整理提供，如果还有疑问可以点击头像关注私信或评论。

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在使用MailKit收取IMAP邮件时，可以通过实现邮件监听器（IMailFolder）来实现实时获取新接收的邮件。其中可以使用事件订阅的方式，在有新邮件到达时触发事件，从而获取最新的邮件数据。 下面是一种实现方式的示例代码：

using System;
using MailKit;
using MailKit.Net.Imap;
using MailKit.Search;
using System.Threading;
class Program
{
    static void Main(string[] args)
    {
        var today = DateTimeOffset.Now.Date;
        String wechatemail = "[e-mail]";
        var wechatQuery = SearchQuery.DeliveredAfter(today).And(SearchQuery.FromContains(wechatemail));
        String imapServer = "imap.qq.com";
        int port = 993;
        
        using (var client = new ImapClient())
        {
            client.Connect(imapServer, port, true);
            client.Authenticate("[e-mail]", "234234214312");
            
            var inbox = client.Inbox;
            inbox.Open(FolderAccess.ReadOnly);
            var wechatResults = inbox.Search(wechatQuery);
            foreach (var uid in wechatResults)
            {
                var message = inbox.GetMessage(uid);
                DateTimeOffset sentDate = message.Date;
                Console.WriteLine("Received new message: " + message.Subject);
            }
            
            // Implement email listener to get real-time updates
            inbox.CountChanged += (sender, e) =>
            {
                var newMessage = inbox.GetMessage(inbox.Count - 1);
                Console.WriteLine("Received new message: " + newMessage.Subject);
            };
            
            // Keep the program running to continue listening for new emails
            while (!cts.Token.IsCancellationRequested)
            {
                client.Idle();
            }
        }
    }
}

通过实现邮件监听器并订阅CountChanged事件，可以在有新邮件到达时得到实时通知。这样就避免了轮询请求导致的延迟，实现了及时获取新接收的邮件数据。