Attach a File to an Email

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Demonstrates the Chilkat Email.AddFileAttachment method, which attaches a file read from the filesystem. It returns the content type Chilkat assigned to the attachment (inferred from the file extension). This example attaches a PDF and prints its detected content type.

Background: Each attachment carries a Content-Type (MIME type) such as application/pdf or image/png that tells the receiving client how to handle it. Chilkat gets this from the file's extension. Because attachment bytes are binary, they are Base64-encoded for transport, which is handled automatically — you simply point AddFileAttachment at a path and the file is read, encoded, and packaged into the message.

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//  Demonstrates the AddFileAttachment method, which attaches a file read from the
//  filesystem.  It returns the content type Chilkat assigned to the attachment (based on
//  the file extension), or returns failure if the file could not be read.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Email with a file attachment";
email.Body = "Please see the attached file.";

//  Attach a file.  The return value is the auto-detected content type.
string contentType = email.AddFileAttachment("qa_data/attachments/report.pdf");
if (email.LastMethodSuccess == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

Debug.WriteLine("Attached content type = " + contentType);
Debug.WriteLine("NumAttachments = " + Convert.ToString(email.NumAttachments));

//  Note: The path "qa_data/attachments/report.pdf" is a relative local filesystem path,
//  relative to the current working directory of the running application.