Enumerate the Header Fields of an Email

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Demonstrates the read-only Chilkat Email.NumHeaderFields property together with GetHeaderFieldName and GetHeaderFieldValue to enumerate every header field. Indexing is zero-based, so fields run from 0 to NumHeaderFields - 1. Repeated header fields (a field name that appears more than once) are counted separately. This example builds a small email and prints each header field.

Background: A header field is a single Name: value line at the top of a MIME message. The same field name can legitimately appear multiple times — for example, a message can carry several Received lines, one added by each mail server it passed through. That is why enumerating by index (rather than looking up by name) matters: it lets you see every occurrence in the order it appears.

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//  Demonstrates the read-only Email.NumHeaderFields property and enumerating each
//  header field by zero-based index using GetHeaderFieldName and GetHeaderFieldValue.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Header field enumeration";
email.From = "mary@example.com";
email.AddTo("Joe","joe@example.com");

int n = email.NumHeaderFields;
Debug.WriteLine("NumHeaderFields = " + Convert.ToString(n));

int i;
for (i = 0; i <= n - 1; i++) {
    Debug.WriteLine(email.GetHeaderFieldName(i) + ": " + email.GetHeaderFieldValue(i));
}