Set the Content-Disposition of an Attachment

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Demonstrates the Chilkat Email.SetAttachmentDisposition method, which sets the Content-Disposition value for the attachment at a given zero-based index. The default disposition is attachment. This example changes an attachment's disposition to inline.

Background: The Content-Disposition header hints how a client should present a part: attachment means "offer it as a download," while inline means "display it within the message" (as an email client does with an embedded image). Setting it lets you control that behavior — though clients ultimately decide how to honor the hint.

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bool success = false;

//  Demonstrates the SetAttachmentDisposition method, which sets the Content-Disposition
//  value for the attachment at the given zero-based index.  The default disposition is
//  "attachment".

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Set attachment disposition";

email.AddStringAttachment("image.txt","(pretend inline content)");

//  Set the disposition of the first attachment (index 0) to "inline".
success = email.SetAttachmentDisposition(0,"inline");
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  The attachment's Content-Disposition is now "inline".
Debug.WriteLine(email.GetMime());