使用c發送帶有大附件的郵件＃

我正在嘗試使用「smtp.gmail.com」使用Smtp發送電子郵件。我們的項目使用.net 3.5 Framweork和c＃來保持XP兼容性。但是，當附件超過5MB時，我總是失敗。我讀過谷歌smtp允許發送大至25MB的附件。然而，當我嘗試這樣做，它總是拋出錯誤：使用c發送帶有大附件的郵件＃

System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: The write operation failed, see inner exception. ---> System.Threading.ThreadAbortException: Thread was being aborted. 
    at System.Net.UnsafeNclNativeMethods.OSSOCK.send(IntPtr socketHandle, Byte* pinnedBuffer, Int32 len, SocketFlags socketFlags) 
    at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, SocketError& errorCode) 
    at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) 
    at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size) 
    at System.Net.Security._SslStream.StartWriting(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) 
    at System.Net.Security._SslStream.ProcessWrite(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) 
    --- End of inner exception stack trace --- 
    at System.Net.Security._SslStream.ProcessWrite(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest) 
    at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size) 
    at System.Net.DelegatedStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.DelegatedStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.DelegatedStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.DelegatedStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.DelegatedStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.DelegatedStream.Write(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.Base64Stream.FlushInternal() 
    at System.Net.Base64Stream.Write(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.Mime.MimePart.Send(BaseWriter writer) 
    at System.Net.Mime.MimeMultiPart.Send(BaseWriter writer) 
    at System.Net.Mail.SmtpClient.Send(MailMessage message) 
    --- End of inner exception stack trace --- 
    at System.Net.Mail.SmtpClient.Send(MailMessage message)

這是我用來發送郵件的方法：

public void Send(SMTPServerInfo serverInfo, string from, string to, string subject, string body, IList<Attachment> attachments) 
{ 
    SmtpClient client = new SmtpClient(); 
    client.EnableSsl = serverInfo.EnableSSL; 
    MailMessage message = new MailMessage(from, to, subject, body); 
    if(IsHTML) 
    message.IsBodyHtml = true; 
    client.Host = serverInfo.ServerName; 
    if(!Text.IsEmpty(serverInfo.UserName)) 
    client.Credentials = new NetworkCredential(serverInfo.UserName, serverInfo.Password); 
    if(serverInfo.Port.HasValue) 
    client.Port = serverInfo.Port.Value; 
    if(attachments != null) 
    foreach(Attachment attachment in attachments) 
     message.Attachments.Add(attachment); 

    client.Send(message); 
    message.Dispose(); 
}

我不知道爲什麼會這樣。

來源

2016-09-27 kfmlx

什麼是內部異常信息？ – ChrisBint

我已經用GMX郵件服務器測試過你的代碼，它工作得很好。我用.NET 3.5編譯它，併發送8.53 MB文件 - 沒有錯誤。我認爲這可能是GMail的限制。（可能會在帳戶設置中以某種方式調整？） –

@ChrisBint我更新內部異常堆棧跟蹤。 – kfmlx

此錯誤時拋出的SMTP是力發送大附件時停止。問題不在SMTP內，也不在Timeout中。參見：

System.Threading.ThreadAbortException: Thread was being aborted

這就是顯示錯誤的原因。發送電子郵件的線程被中止。請參閱我們可能需要檢查線程問題的更多信息。

來源

2016-10-14 01:46:41 kfmlx

你必須實例化郵件是這樣的：

System.Net.Mail.Attachment attachment1; 
attachment1 = new System.Net.Mail.Attachment(attachmentFilePath_Here); 
message.Attachments.Add(attachment1);

來源

2016-09-27 07:46:43 redzsol

這個問題不是添加附件，而是它們的大小，上面的幫助如何？ – ChrisBint

使用c發送帶有大附件的郵件＃

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