(VB.NET UWP/WinRT) 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 interate over the message numbers in the set to download one by one.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

' This example copies an email from one mailbox to another.
Dim imap As New Chilkat.Imap

' Connect using TLS.
imap.Ssl = True
imap.Port = 993
Dim success As Boolean = Await imap.ConnectAsync("imap.example.com")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Authenticate
success = Await imap.LoginAsync("email_account_login","email_account_password")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Select an IMAP mailbox
success = Await imap.SelectMailboxAsync("Inbox")
If (success <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Search for messages having "Test email" in the subject.
Dim fetchUids As Boolean = True
Dim messageSet As Chilkat.MessageSet = Await imap.SearchAsync("ALL",fetchUids)
If (imap.LastMethodSuccess <> True) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Number of messages = " & messageSet.Count)

Dim i As Integer = 0
While i < messageSet.Count
    Dim email As Chilkat.Email = Await imap.FetchSingleAsync(messageSet.GetId(i),fetchUids)
    If (imap.LastMethodSuccess <> True) Then
        Debug.WriteLine(imap.LastErrorText)

        Exit Sub
    End If

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


    i = i + 1
End While



Debug.WriteLine("OK")