EWS 拉取订阅新的或修改的日历事件

我一直在寻找一个 EWS 拉取订阅示例，该示例允许我获取自拉取订阅启动以来为用户创建或修改的日历事件列表。 我有工作代码来获取收件箱的此信息，但我还没有找到如何为日历执行此操作的好示例。

下面是收件箱的示例;任何人都可以为我提供一个链接或代码示例，以便使用 Exchange Web 服务请求订阅为日历事件或约会完成相同的操作吗？

    ExchangeService service;
    PullSubscription subscriptionInbox;
    private void SetService() {
        service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
        service.Url = new Uri("https://mail.myserver.com/EWS/Exchange.asmx");
    }
    private void SetSubscription() {
        if(service == null) {
            SetService();
        }
        // Subscribe to pull notifications in the Inbox folder, and get notified when
        // a new mail is received, when an item or folder is created, or when an item
        // or folder is deleted. 
        subscriptionInbox = service.SubscribeToPullNotifications(
        new FolderId[] { WellKnownFolderName.Inbox },
        5 /* timeOut: the subscription will end if the server is not polled within 5 minutes. */,
        null /* watermark: null to start a new subscription. */,
        EventType.NewMail, EventType.Modified);
    }
    private void btnGetLatestMessages_Click(object sender, EventArgs e) {
        if(subscriptionInbox == null) {
            SetSubscription();
        }
        GetEventsResults eventsInbox = subscriptionInbox.GetEvents();
        EmailMessage message;
        // Loop through all item-related events.
        foreach(ItemEvent itemEvent in eventsInbox.ItemEvents) {
            switch(itemEvent.EventType) {
                case EventType.NewMail:
                    try {
                        Item item = Item.Bind(service, itemEvent.ItemId);
                        if(item.ItemClass.ToLower() == "IPM.Note".ToLower()) {
                            message = EmailMessage.Bind(service, itemEvent.ItemId);
                            MessageBox.Show("Inbox/NewMail - " + message.Subject);
                        }
                    } catch(Exception ex) {
                        MessageBox.Show("EventType.NewMail - " + itemEvent.ItemId);
                    }
                    break;
                case EventType.Modified:
                    try {
                        Item item = Item.Bind(service, itemEvent.ItemId);
                        if(item.ItemClass.ToLower() == "IPM.Note".ToLower()) {
                            message = EmailMessage.Bind(service, itemEvent.ItemId);
                            MessageBox.Show("Inbox/Modified - " + message.Subject);
                        }
                    } catch(Exception ex) {
                        MessageBox.Show("EventType.NewMail - " + itemEvent.ItemId);
                    }
                    break;
            }
        }
    }

var subscriptionCalendar = service.SubscribeToPullNotifications(
    new[] { new FolderId(WellKnownFolderName.Calendar) }, 
    1440, 
    null, 
    EventType.Created, EventType.Modified);