(.NET Core 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.

Chilkat .NET Downloads Chilkat .NET Assemblies Chilkat for .NET Core Chilkat for Mono

// 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();