Question

我使用EWS API连接并检索来自Exchange 2007服务器的邮件，该工作正常。现在我想获得拉动通知。我找到了一个例子here，这是我尝试过的：

public IEnumerable<ItemEvent> GetPullNotifications(FolderId folderId)
{
    PullSubscription subscription = Service.SubscribeToPullNotifications(new FolderId[] { folderId }, 5, null, EventType.NewMail, EventType.Created, EventType.Deleted);
    return subscription.GetEvents().ItemEvents;
}

public void CheckPullNotifications(object source, ElapsedEventArgs e)
{
    Console.WriteLine("Check...");
    IEnumerable<ItemEvent> itemEvents = ewsClient.GetPullNotifications(WellKnownFolderName.Inbox);
    foreach (ItemEvent itemEvent in itemEvents)
    {
        switch (itemEvent.EventType)
        {
            case EventType.NewMail:
                MessageBox.Show("New mail: " + itemEvent.ItemId.UniqueId);
                break;
            case EventType.Deleted:
                MessageBox.Show("Mail deleted: " + itemEvent.ItemId.UniqueId);
                break;
        }
    }

    return;
}

//...
Timer myTimer = new Timer();
myTimer.Elapsed += new ElapsedEventHandler(CheckPullNotifications);
myTimer.Interval = 1000;
myTimer.Start();

但是，当我在那里放置断点时，我从未接触到上述开关。我发了几封邮件并删了一些，没有任何反应。

为什么这不起作用的任何想法？或者还有其他方法可以获得拉动通知吗？

Answer 1

我找到了解决方案。我上面做的是创建一个新的订阅，并立即尝试获得结果。相反，我必须创建一次订阅，然后不时地提取结果。

示例：

public void SubscribePullNotifications(FolderId folderId)
{
    Subscription = Service.SubscribeToPullNotifications(new FolderId[] { folderId }, 1440, null, EventType.NewMail, EventType.Created, EventType.Deleted);
}

public void GetPullNotifications()
{
    IEnumerable<ItemEvent> itemEvents = Subscription.GetEvents().ItemEvents;
    foreach (ItemEvent itemEvent in itemEvents)
    {
        switch (itemEvent.EventType)
        {
            case EventType.NewMail:
                MessageBox.Show("New Mail");
                break;
        }
    }
}
// ...
SubscribePullNotifications(WellKnownFolderName.Inbox);
Timer myTimer = new Timer();
myTimer.Elapsed += new ElapsedEventHandler(GetPullNotifications);
myTimer.Interval = 10000;
myTimer.Start();

EWS API：如何获取拉动通知？

1 个答案: