How Can I Attach Files from a MemoryStream to a MailMessage?

Accessing Memory Streams for File Attachments in MailMessages

Attaching files from a MemoryStream to a MailMessage can eliminate the need for intermediate file storage. This article explores a solution to this problem.

To achieve this, a MemoryStream is created and populated with the file's content using a StreamWriter. Once the file is in memory, its position is reset to the beginning.

A MimeContentType is then defined based on the file type (e.g., text/plain for plain text). Finally, a new Attachment is created using the MemoryStream and assigned a filename.

Here's an example code snippet:

System.IO.MemoryStream ms = new System.IO.MemoryStream();
System.IO.StreamWriter writer = new System.IO.StreamWriter(ms);
writer.Write("Hello its my sample file");
writer.Flush();
writer.Dispose();
ms.Position = 0;

System.Net.Mime.ContentType ct = new System.Net.Mime.ContentType(System.Net.Mime.MediaTypeNames.Text.Plain);
System.Net.Mail.Attachment attach = new System.Net.Mail.Attachment(ms, ct);
attach.ContentDisposition.FileName = "myFile.txt";

This approach allows you to attach files directly from memory, eliminating the need for intermediate file storage on disk. You can specify different MimeTypes to accommodate various file formats and ensure proper filename extensions.

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