Get a Header Field of a Related Item

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Demonstrates the Chilkat Email.GetRelatedHeader method, which returns the value of a named header field of a related item. The first argument is the zero-based related-item index and the second is the MIME header-field name. This example reads the Content-Type header of a related style sheet.

Background: Each related item is a MIME part with its own header block. Where GetRelatedAttr extracts a single named parameter from a header, GetRelatedHeader returns the entire value of a header field — for example the full Content-Type or Content-Location line — which is handy for inspecting exactly how an embedded resource is described.

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

Chilkat.Email email = new Chilkat.Email();
email.Subject = "GetRelatedHeader example";

//  Set an HTML body and add a related style sheet (index 0).
email.SetHtmlBody("<html><head><link rel=\"stylesheet\" href=\"styles.css\"/></head><body>Styled.</body></html>");
email.AddRelatedString2("styles.css","body { color: navy; }","utf-8");

//  Get the Content-Type header of the first related item (index 0).
string ct = email.GetRelatedHeader(0,"Content-Type");
Debug.WriteLine("Related item 0 Content-Type: " + ct);