System.OutOfMemoryException下載很多附件時使用MailKit

我從幾個電子郵件帳戶下載附件。我在每個賬戶上都有300個附件（他們是鏡子）。當我想只從一個帳戶下載附件，我在程序日誌中出現錯誤：System.OutOfMemoryException下載很多附件時使用MailKit

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09.04.2017 16:10:07: Download attachment nr 108 from task Movie.avi 
09.04.2017 16:10:59: Download attachment nr 109 from task Movie.avi 
09.04.2017 16:11:26: Download attachment nr 110 from task Movie.avi 
09.04.2017 16:12:07: Download attachment nr 111 from task Movie.avi 
09.04.2017 16:12:34: Download attachment nr 112 from task Movie.avi 
09.04.2017 16:13:07: Download attachment nr 113 from task Movie.avi 
09.04.2017 16:13:55: Download attachment nr 114 from task Movie.avi 
09.04.2017 16:14:03: System.OutOfMemoryException: Zgłoszono wyjątek typu 'System.OutOfMemoryException'. 
    w MimeKit.IO.MemoryBlockStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
    w MailKit.Net.Imap.ImapFolder.FetchStream(ImapEngine engine, ImapCommand ic, Int32 index) 
    w MailKit.Net.Imap.ImapEngine.ProcessUntaggedResponse(CancellationToken cancellationToken) 
    w MailKit.Net.Imap.ImapCommand.Step() 
    w MailKit.Net.Imap.ImapEngine.Iterate() 
    w MailKit.Net.Imap.ImapEngine.Wait(ImapCommand ic) 
    w MailKit.Net.Imap.ImapFolder.GetMessage(UniqueId uid, CancellationToken cancellationToken, ITransferProgress progress) 
    w MailExchange.Form1.makeDownload(String nazwa) w c:\Users\DamianOS.MP5\Documents\mailexchange\MailExchange\Form1.cs:wiersz 1086 
09.04.2017 16:14:47: System.OutOfMemoryException: Zgłoszono wyjątek typu 'System.OutOfMemoryException'. 
    w MailKit.Net.Imap.ImapStream.ReadQuotedStringToken(Byte* inbuf, CancellationToken cancellationToken) 
    w MailKit.Net.Imap.ImapStream.ReadToken(String specials, CancellationToken cancellationToken) 
    w MailKit.Net.Imap.ImapStream.ReadToken(CancellationToken cancellationToken) 
    w MailKit.Net.Imap.ImapUtils.ParseEnvelopeAddress(ImapEngine engine, String format, CancellationToken cancellationToken) 
    w MailKit.Net.Imap.ImapUtils.ParseEnvelopeAddressList(InternetAddressList list, ImapEngine engine, String format, CancellationToken cancellationToken) 
    w MailKit.Net.Imap.ImapUtils.ParseEnvelope(ImapEngine engine, CancellationToken cancellationToken) 
    w MailKit.Net.Imap.ImapFolder.FetchSummaryItems(ImapEngine engine, ImapCommand ic, Int32 index) 
    w MailKit.Net.Imap.ImapEngine.ProcessUntaggedResponse(CancellationToken cancellationToken) 
    w MailKit.Net.Imap.ImapCommand.Step() 
    w MailKit.Net.Imap.ImapEngine.Iterate() 
    w MailKit.Net.Imap.ImapEngine.Wait(ImapCommand ic) 
    w MailKit.Net.Imap.ImapFolder.Fetch(Int32 min, Int32 max, MessageSummaryItems items, CancellationToken cancellationToken) 
    w MailExchange.Form1.makeDownload(String nazwa) w c:\Users\DamianOS.MP5\Documents\mailexchange\MailExchange\Form1.cs:wiersz 1041 
09.04.2017 16:15:04: System.OutOfMemoryException: Zgłoszono wyjątek typu 'System.OutOfMemoryException'. 
    w System.Text.StringBuilder..ctor(String value, Int32 startIndex, Int32 length, Int32 capacity) 
    w MimeKit.Utils.ParseUtils.TryParseDotAtom(Byte[] text, Int32& index, Int32 endIndex, Byte[] sentinels, Boolean throwOnError, String tokenType, String& dotatom) 
    w MimeKit.InternetAddress.TryParseAddrspec(Byte[] text, Int32& index, Int32 endIndex, Byte[] sentinels, Boolean throwOnError, String& addrspec) 
    w MimeKit.InternetAddress.TryParseMailbox(ParserOptions options, Byte[] text, Int32 startIndex, Int32& index, Int32 endIndex, String name, Int32 codepage, Boolean throwOnError, InternetAddress& address) 
    w MimeKit.InternetAddress.TryParse(ParserOptions options, Byte[] text, Int32& index, Int32 endIndex, AddressParserFlags flags, InternetAddress& address) 
    w MimeKit.InternetAddressList.TryParse(ParserOptions options, Byte[] text, Int32& index, Int32 endIndex, Boolean isGroup, Boolean throwOnError, List`1& addresses) 
    w MimeKit.MimeMessage.AddAddresses(Header header, InternetAddressList list) 
    w MimeKit.MimeMessage.HeadersChanged(Object o, HeaderListChangedEventArgs e) 
    w MimeKit.HeaderList.OnChanged(Header header, HeaderListChangedAction action) 
    w MimeKit.HeaderList.Add(Header header) 
    w MimeKit.MimeMessage..ctor(ParserOptions options, IEnumerable`1 headers) 
    w MimeKit.MimeParser.ParseMessage(Byte* inbuf) 
    w MimeKit.MimeParser.ParseMessage(CancellationToken cancellationToken) 
    w MailKit.Net.Pop3.Pop3Client.DownloadHeaderContext.Parse(Pop3Stream data, CancellationToken cancellationToken) 
    w MailKit.Net.Pop3.Pop3Client.DownloadContext`1.OnDataReceived(Pop3Engine pop3, Pop3Command pc, String text) 
    w MailKit.Net.Pop3.Pop3Engine.ReadResponse(Pop3Command pc) 
    w MailKit.Net.Pop3.Pop3Engine.Iterate() 
    w MailKit.Net.Pop3.Pop3Client.DownloadContext`1.DownloadItem(Int32 seqid, Boolean headersOnly, CancellationToken cancellationToken) 
    w MailKit.Net.Pop3.Pop3Client.GetMessageHeaders(Int32 index, CancellationToken cancellationToken) 
    w MailExchange.Form1.makeDownload(String nazwa) w c:\Users\DamianOS.MP5\Documents\mailexchange\MailExchange\Form1.cs:wiersz 1053

當我下載例如，從第一個帳戶100個附件，從第二個帳戶100個附件，100從第三個帳戶，一切沒問題。但我想從一個帳戶下載300個附件。行有錯誤：

//1086 line: 
readyMessages.Add(client.Inbox.GetMessage(imapReadySubjects[posortowanaLista[i]].UniqueId, cancellationToken, progress)); 
//1041 line: 
IList<IMessageSummary> allMailList = client.Inbox.Fetch(0, -1, MessageSummaryItems.Envelope | MessageSummaryItems.UniqueId, cancellationToken); 
//1053 line: 
for (int i = 0; i < client2.Count; i++) 
    allMailLists.Add(client2.GetMessageHeaders(i), i);

從文件的完整代碼： https://bitbucket.org/DamianOS_MP5/mailexchange/src/3af44d3ffa7e61fb40afbcb7d75fefd068b80ff6/MailExchange/Form1.cs?at=master&fileviewer=file-view-default

來源

2017-04-09 DamianOS.MP5

你能提供更多信息嗎？你的問題不是很清楚。你是問爲什麼更大的下載批量可能是一個問題，以及你如何解決它？你在問別的嗎？ – stackuser83