Umbraco-如何添加自定义通知？

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public class CustomEvents : ApplicationBase
{
    public CustomEvents()
    {
        Document.AfterUnPublish += new Document.UnPublishEventHandler(Document_AfterUnPublish);
    }

    void Document_AfterUnPublish(Document sender, umbraco.cms.businesslogic.UnPublishEventArgs e)
    {
        var user = User.GetCurrent();

        if (!string.IsNullOrEmpty(user.Email) && user.GetNotifications(sender.Path).Contains(\"UnPublish\"))
        {
            //Send a notification here using default Umbraco settings, or, construct email and send manually:
            string umbracoNotificationSenderAddress = \"\";   //How to get the address stored in umbracoSettings.config -> <notifications> -> <email>

            //How to use the same subject/message formats used for other notifications? With the links back to the content?
            string subject = \"Notification of UnPublish performed on \" + MyUtilities.GetFriendlyName(sender.Id);
            string message = MyUtilities.GetFriendlyName(sender.Id) + \" has just been unpublished.\";

            umbraco.library.SendMail(umbracoNotificationSenderAddress, user.Email, subject, message, true);
        }
    }
}