(C#)how to delete attach file after send mail?

Question

1.00/5 (1 vote)

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I use SmtpClient's SendAsync method,when after send mail, i delete the file ,tip The process cannot access the file because it is being used by another process.

C#

System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
SmtpClient client = new SmtpClient();

 if(attachmentPath != "")
   {
    using (Attachment dataAttach = new Attachment(attachmentPath))
    {
        msg.Attachments.Add(new Attachment(attachmentPath));
        dataAttach.Dispose();
    }
   }
   .....
   .....
   client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);
   client.SendAsync(msg, userState);

   private static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e)
  {
    ......
    ......
    ......  
    System.IO.File.Delete(AttachFileNamePath);  //here tip: The process cannot access the file because it is being used by another process.
}

Posted 21-Jul-13 20:16pm

gzdreamway

Updated 31-May-22 4:00am

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Comments

Sergey Alexandrovich Kryukov 22-Jul-13 2:23am

Do you understand that nothing is really "attached"? The file content is simply embedded in the body of the mail, as a "part".
So, strictly speaking, you don't need a source file.
—SA

gzdreamway 22-Jul-13 2:50am

I omitted part of the code, the attachment is a picture
--------------------------------------------------------------------------
System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
SmtpClient client = new SmtpClient();
string attachmentPath="c:\\test.jpg"
if(attachmentPath != "")
{
........
.......
}

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Thanks7872 · Answer 1 · 2013-07-21T20:33:00

Solution 1

Error is always self explanatory. Its not there just to show you that something went wrong,but further it also says something. Its very clear that file is being used by some process. In order to overcome this error,try to release that resource first.

You are trying to delete the file which is being attached and sent.

Regards..:laugh:

Posted 21-Jul-13 20:33pm

Thanks7872

Comments

gzdreamway 22-Jul-13 2:37am

try to release that resource
--------------------------------------------------------------------------
I release here ， but not work.
dataAttach.Dispose();

Thanks7872 22-Jul-13 2:38am

Try to release it at appropriate time,like after mail sent successfully.

msg.Attachments.Add(new Attachment(attachmentPath));

By this line,you have attached nothing in real sense.

gzdreamway 22-Jul-13 2:48am

System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
SmtpClient client = new SmtpClient();
string attachmentPath="c:\\test.jpg"

if(attachmentPath != "")
........
.......

gzdreamway · Answer 2 · 2013-07-21T20:33:00

I omitted part of the code, the attachment is a picture

C#

System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
SmtpClient client = new SmtpClient();
string attachmentPath="c:\\test.jpg" 
 
 if(attachmentPath != "")
   {
    using (Attachment dataAttach = new Attachment(attachmentPath))
    {
        msg.Attachments.Add(new Attachment(attachmentPath));
        dataAttach.Dispose();
    }
   }

seyedbagheri · Answer 3 · 2022-05-31T04:00:00

Solution 3

Try to use attachment Dispose() method after sending the email

C#

smtpClient.SendCompleted += SendCompletedCallback;
await smtpClient.SendMailAsync(message);
message.Attachments.Dispose();

Posted 31-May-22 4:00am

seyedbagheri

Comments

Dave Kreskowiak 31-May-22 10:35am

You didn't understand the question nor the problem.

The attached files will be locked until they are uploaded to the email server. Disposing the attachments collection will not fix this problem, nor does it delete the files off the client machine after they are sent.

(C#)how to delete attach file after send mail?

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