.Net - 通过 IMAP 协议从 Gmail 获取未读邮件时出错

Question

我正在尝试通过 IMAP 协议从 Gmail 中获取未读邮件。我遵循了这个教程： https://briancaos.wordpress.com/2012/04/24/reading-mails-using-imap-and-mailsystem-net/#comment-4999 ，它收到了很多好评。但是当我打电话给

MessageCollection messages = mails.SearchParse("UNSEEN");

我收到错误消息 "index and length must refer to a location within the string"。我只是调用了一个简单的函数，所以我不知道哪里出了问题。有关详细信息，这是我的代码片段：

public class MailRepository
{

    private Imap4Client _client = null;

    public MailRepository(string mailServer, int port, bool ssl, string login, string password)
    {
        if (ssl)
            Client.ConnectSsl(mailServer, port);
        else
            Client.Connect(mailServer, port);
        Client.Login(login, password);
    }

    public IEnumerable<Message> GetAllMails(string mailBox)
    {
        return GetMails(mailBox, "ALL").Cast<Message>();
    }

    public IEnumerable<Message> GetUnreadMails(string mailBox)
    {
        return GetMails(mailBox, "UNSEEN").Cast<Message>();
    }

    protected Imap4Client Client
    {
        get
        {
            if (_client == null)
                _client = new Imap4Client();
            return _client;
        }
    }

    private MessageCollection GetMails(string mailBox, string searchPhrase)
    {
        Mailbox mails = Client.SelectMailbox(mailBox);
        MessageCollection messages = mails.SearchParse(searchPhrase);
        return messages;
    }
}

Answer 1

当您的邮件包含非 ASCII 字符时，可能会出现此错误。由于我在这里看不到简单的修复方法，并且不再支持 MailSystem.NET，因此我建议使用替代库。

Mailkit seems to be a good option. Also look here for further reference:

.Net - 通过 IMAP 协议从 Gmail 获取未读邮件时出错

.Net - Error when get unread mail from Gmail by IMAP protocol

c#

asp.net

imap

gmail-imap