没有文件夹名称空间时在MailKit中打开邮件文件夹

Question

[在尝试打开邮件文件夹时，我们在客户端遇到了一个问题，但找不到它，因此我创建了以下方法，以尽最大努力找到该邮件文件夹所在的文件夹名称空间。] >

private FolderNamespace FindFolderNamespace(ImapClient imapClient, string folderName)
{
    string[] folderNameParts = folderName.Split('/');

    FolderNamespaceCollection folderNamespaces = new FolderNamespaceCollection();
    foreach (FolderNamespace folderNamespace in imapClient.PersonalNamespaces) folderNamespaces.Add(folderNamespace);
    foreach (FolderNamespace folderNamespace in imapClient.SharedNamespaces) folderNamespaces.Add(folderNamespace);
    foreach (FolderNamespace folderNamespace in imapClient.OtherNamespaces) folderNamespaces.Add(folderNamespace);

    Dictionary<FolderNamespace, string> potentialFolderNamespaces = new Dictionary<FolderNamespace, string>();
    foreach (FolderNamespace folderNamespace in folderNamespaces)
    {
        IMailFolder mailFolder = imapClient.GetFolder(folderNamespace);
        foreach (string folderNamePart in folderNameParts)
        {
            if (mailFolder.GetSubfolders().Any(mf => mf.Name.Equals(folderNamePart, StringComparison.OrdinalIgnoreCase)))
            {
                mailFolder = mailFolder.GetSubfolder(folderNamePart);
            }
            else
            {
                break;
            }
        }

        if (mailFolder.FullName.IndexOf(folderName, StringComparison.OrdinalIgnoreCase) >= 0)
        {
            return folderNamespace;
        }

        if (!mailFolder.IsNamespace)
        {
            potentialFolderNamespaces.Add(folderNamespace, mailFolder.FullName);
        }
    }

    FolderNamespace closestFolderNameSpace = potentialFolderNamespaces.OrderByDescending(n => n.Value.Length).FirstOrDefault().Key;
    if (closestFolderNameSpace != null)
    {
        return closestFolderNameSpace;
    }

    FolderNamespace defaultFolderNamespace = folderNamespaces.FirstOrDefault();

    return defaultFolderNamespace;
}
但是，这没有用。经过仔细检查，似乎PersonalNamespaces，SharedNamespaces和OtherNamespaces都是空的，因此该帐户没有文件夹名称空间。

作为快速检查，我尝试了以下方法：

imapClient.GetFolder(folderName)
但是，这引发了一个ImapProtocolException的说法：

IMAP服务器意外断开连接。

仅尝试使用根文件夹名称也做了同样的事情。

我有点茫然，我似乎无法找到该帐户，因此无法在该帐户上打开文件夹。我该怎么办？

---

更多详细信息：

• 。Net 4.6.1
• MailKit / MimeKit版本1.1，但更新至2.4.1没有帮助
• Office365 IMAP帐户

---

协议日志：

Connected to --cut--
S: * OK The Microsoft Exchange IMAP4 service is ready. --cut--
C: A00000000 CAPABILITY
S: * CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS MOVE ID UNSELECT CHILDREN IDLE NAMESPACE LITERAL+
S: A00000000 OK CAPABILITY completed.
C: A00000001 AUTHENTICATE XOAUTH2 --cut--
S: A00000001 NO AUTHENTICATE failed.
C: A00000002 AUTHENTICATE PLAIN --cut--
S: A00000002 OK AUTHENTICATE completed.
C: A00000003 CAPABILITY
S: * CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS MOVE ID UNSELECT CLIENTACCESSRULES CLIENTNETWORKPRESENCELOCATION BACKENDAUTHENTICATE CHILDREN IDLE NAMESPACE LITERAL+
S: A00000003 OK CAPABILITY completed.
C: A00000004 NAMESPACE
S: A00000004 BAD User is authenticated but not connected.
C: A00000005 LIST "" "INBOX"
S: A00000005 BAD User is authenticated but not connected.
S: * BYE Connection closed. 14

[在尝试打开邮件文件夹时，我们在客户端遇到了一个问题，但找不到它，因此我创建了以下方法，以尽最大努力找到邮件文件夹的文件夹名称空间...] >

Answer 1

这里是问题：

C: A00000004 NAMESPACE
S: A00000004 BAD User is authenticated but not connected.
C: A00000005 LIST "" "INBOX"
S: A00000005 BAD User is authenticated but not connected.
S: * BYE Connection closed. 14