(.NET Core C#) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Imap imap = new Chilkat.Imap();

// Connect using TLS.
imap.Ssl = true;
imap.Port = 993;
bool success = imap.Connect("imap.example.com");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Authenticate
success = imap.Login("email_account_login","email_account_password");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Select an IMAP mailbox
success = imap.SelectMailbox("Inbox");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

// Search for messages and return a set of matching messages.
// (This example will simply search for ALL messages.)
bool fetchUids = true;
Chilkat.MessageSet messageSet = imap.Search("ALL",fetchUids);
if (imap.LastMethodSuccess != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

Debug.WriteLine("Number of messages = " + Convert.ToString(messageSet.Count));

int i = 0;
while (i < messageSet.Count) {
    Chilkat.Email email = imap.FetchSingle(messageSet.GetId(i),fetchUids);
    if (imap.LastMethodSuccess != true) {
        Debug.WriteLine(imap.LastErrorText);

        return;
    }

    Debug.WriteLine(email.From + "; " + email.Subject);

    i = i + 1;
}

Debug.WriteLine("OK");