Outlook ContactItem: get containing folder?

I am maintaining an Outlook add in that manages Outlook contacts. I have a function that g开发者_如何学Goets all the contacts in a folder and its subfolders. Now, I need to determine which folder a given contact was retrieved from. Is this possible without scanning each of the folders or returning the paths along with each of the contact items?

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This works for me:

public string GetFolderFullName(Outlook.ContactItem ci) {
    Outlook.MAPIFolder mf = ci.Parent;
    string path = mf.FolderPath;
    return path;
}