mailkit imap client Inbox.MoveTo "The folder is not currently open in read-write mode."-CodePudding

I am having an issue moving mail out of the inbox to a subfolder on the mail server using the MailKit/MimeKit tools. Currently I can read email in either folder, as well as delete email from either folder. The mail server is microsoft exchange 365. I am not currently having any issue with any imap function using the Mozilla Thunderbird client. My code is as follows:

public void MoveEmail(string index, string folder)
{
    using (var client = new MailKit.Net.Imap.ImapClient())
    {
        client.Connect(ServerUrl, ServerPort, true);
        client.Authenticate(UserName, Password);
        client.Inbox.Open(MailKit.FolderAccess.ReadWrite);
        if (!client.Inbox.IsOpen == true)
            throw new Exception("Inbox is not open.");

        var dingle = client.Inbox.GetSubfolder(folder);
        dingle.Open(MailKit.FolderAccess.ReadWrite);
        if (!dingle.IsOpen == true)
            throw new Exception("Dingle is not open.");

        client.Inbox.MoveTo(0, dingle);

        var dangle = dingle.Count;
        var wingle = dingle.Fetch(0, -1, MailKit.MessageSummaryItems.Full);

        dingle.Close(false);
        client.Disconnect(true);
    }
}

The code executes all the way through until it hits the move statement, then it throws an exception: "The folder is not currently open in read-write mode."

Thanks for reading! Carl

CodePudding user response：

The problem is that once you open the dingle folder, it closes the Inbox folder. This is how IMAP works (it can only have 1 folder open at a time).

The solution is to not open the dingle folder, just open the Inbox folder.

The code should look like this:

public void MoveEmail(string index, string folder)
{
    using (var client = new MailKit.Net.Imap.ImapClient())
    {
        client.Connect(ServerUrl, ServerPort, true);
        client.Authenticate(UserName, Password);
        client.Inbox.Open(MailKit.FolderAccess.ReadWrite);
        if (!client.Inbox.IsOpen == true)
            throw new Exception("Inbox is not open.");

        var dingle = client.Inbox.GetSubfolder(folder);

        client.Inbox.MoveTo(0, dingle);

        dingle.Open(MailKit.FolderAccess.ReadWrite);
        if (!dingle.IsOpen == true)
            throw new Exception("Dingle is not open.");

        var dangle = dingle.Count;
        var wingle = dingle.Fetch(0, -1, MailKit.MessageSummaryItems.Full);

        dingle.Close(false);
        client.Disconnect(true);
    }
}