(C#) Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server.

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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 to an IMAP server.
// Use TLS
imap.Ssl = true;
imap.Port = 993;
bool success = imap.Connect("imap.someMailServer.com");
if (success != true) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

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

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

// After selecting the mailbox. the total number of emails
// is immediately available:
int totalNum = imap.NumMessages;
Debug.WriteLine("Num messages = " + Convert.ToString(totalNum));

// To determine the number of unseen messages, a call
// to Search is required, which returns the set of UIDs
// of all unseen messages.

// We can choose to fetch UIDs or sequence numbers.
bool fetchUids = true;

Chilkat.MessageSet messageSet = imap.Search("UNSEEN",fetchUids);
if (imap.LastMethodSuccess == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

int numUnseen = messageSet.Count;
Debug.WriteLine(Convert.ToString(numUnseen));

Debug.WriteLine("UIDs ----");

// Display the UIDs
int i = 0;
int msgId;
while (i < messageSet.Count) {
    msgId = messageSet.GetId(i);
    Debug.WriteLine(Convert.ToString(msgId));
    i = i + 1;
}

// Disconnect from the IMAP server.
success = imap.Disconnect();