Get a Header Field of an Attachment

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Demonstrates the Chilkat Email.GetAttachmentHeader method, which returns the value of a named header field of an attachment. The first argument is the zero-based attachment index and the second is the MIME header-field name. This example reads the Content-Disposition header of the first attachment.

Background: Each attachment is a MIME part with its own header block. Where GetAttachmentAttr extracts a single named parameter, GetAttachmentHeader returns the entire value of a header field — for example the full Content-Disposition: attachment; filename="notes.txt" line. That is useful for inspecting or debugging exactly how a part is described, including any custom X- headers a sender may have added.

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//  Demonstrates the GetAttachmentHeader method, which returns the value of a header field
//  (by name) of an attachment.  The first argument is the zero-based attachment index and the second is the
//  MIME header-field name.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Attachment header field";

email.AddStringAttachment("notes.txt","Some notes.");

//  Get the Content-Disposition header of the first attachment (index 0).
string disp = email.GetAttachmentHeader(0,"Content-Disposition");
Debug.WriteLine("Attachment 0 Content-Disposition: " + disp);