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

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i'm trying unread mails gmail imap protocol. followed tuto : https://briancaos.wordpress.com/2012/04/24/reading-mails-using-imap-and-mailsystem-net/#comment-4999 , recieved many comments. when call

messagecollection messages = mails.searchparse("unseen");

i got error message "index , length must refer location within string". call simple function, don't know what's wrong. more detail, here code snippet:

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     {                 {             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;     } }

this error may occur when mails contain non-ascii characters. don't see easy fix here , mailsystem.net no longer supported, recommend using alternative library.

mailkit seems option. here further reference: https://stackoverflow.com/a/23375968


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