Get a Header Attribute of an Attached Message

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Demonstrates the Chilkat Email.GetAttachedMessageAttr method, which returns a header-field attribute value for the Nth attached (embedded) email. The first argument is the zero-based attached-message index, the second is the header field name, and the third is the attribute name. This example attaches an email and reads the filename attribute of its Content-Disposition header.

Background: MIME header fields can carry named attributes (parameters) after the main value — for example Content-Disposition: attachment; filename="report.eml", where filename is an attribute. Rather than parsing the raw header yourself, this method extracts a single named attribute from a chosen header of a specific embedded message, which is convenient when a message forwards other emails as nested message/rfc822 parts.

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bool success = false;

//  Demonstrates the GetAttachedMessageAttr method, which returns a header-field attribute
//  value for the Nth attached (embedded) email.  The first argument is the zero-based
//  attached-message index, the second is the header field name, and the third is the attribute name.

//  Build an inner email to attach.
Chilkat.Email innerEmail = new Chilkat.Email();
innerEmail.Subject = "Embedded message";
innerEmail.From = "alice@example.com";
innerEmail.AddTo("Bob","bob@example.com");

//  Attach it to an outer email as a message/rfc822 part.
Chilkat.Email email = new Chilkat.Email();
email.Subject = "Has an attached message";
success = email.AttachEmail(innerEmail);
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  Get the "filename" attribute of the "Content-Disposition" header of the first
//  attached message (index 0).
string fname = email.GetAttachedMessageAttr(0,"Content-Disposition","filename");
Debug.WriteLine("Attached message filename attribute: " + fname);