exchange-server - 什么导致 OnSubscriptionError 在 EWS API 的 StreamingSubscriptionConnection 中被触发？

Question

我在生产中遇到此错误。不知 Prop 体是什么原因造成的。

OnSubscriptionError : 
    Microsoft.Exchange.WebServices.Data.ServiceResponseException: 
       The specified subscription was not found.

现在我想模拟我的 中的行为开发环境 .

我已订阅事件 Connection.OnSubscriptionError我的事件处理程序是 OnSubscriptionError .现在我想测试处理程序。为此，我想要某种方式来触发我遇到麻烦的那个事件。

我曾尝试在应用程序运行时关闭交换主机服务，但这不会触发 OnsubscriptionError Event .

我想知道以下代码在 OnsubscriptionError event 时是否有效被解雇。或者我必须在创建连接之前重新创建订阅对象。

这是示例代码:

Subscription =_exchangeService.SubscribeToStreamingNotifications(
                new FolderId[] { WellKnownFolderName.Inbox },
                EventType.NewMail);
CreateStreamingSubscription(_exchangeService, Subscription);

private void CreateStreamingSubscription(ExchangeService service,
                                         StreamingSubscription subscription)
{

    // public StreamingSubscriptionConnection(ExchangeService service, int lifetime) lifetime is in minutes and 30 mins is the maximum time till which
    // the connection can be open.
    Connection = new StreamingSubscriptionConnection(service, 30);
    Connection.AddSubscription(subscription);
    Connection.OnNotificationEvent += OnNotificationEvent;
    Connection.OnSubscriptionError += OnSubscriptionError;
    Connection.OnDisconnect += OnDisconnect;
    Connection.Open();
 }  
 private void OnSubscriptionError(object sender, SubscriptionErrorEventArgs args)
 {
    if (args.Exception is ServiceResponseException)
    {
        var exception = args.Exception as ServiceResponseException; 
    }
    else if (args.Exception !=null)
    {
        Logwriter.LogMsg(_clientInfo.LogId, LogLevel.FATAL,
                         "OnSubscriptionError() : " + args.Exception.Message +
                         " Stack Trace : " + args.Exception.StackTrace + 
                         " Inner Exception : " + args.Exception.InnerException);
    }
    try
    {
        Connection = (StreamingSubscriptionConnection)sender;
        if(!Connection.IsOpen)
            Connection.Open();
    }
    catch (ServiceResponseException exception)
    { }
    catch (Exception ex)
    { }
 }

Answer 1

我和你一样实现了一个类似的机制，但没有调用 Connection.Open();您需要重新启动整个订阅...因为正如我上面的@BraveHeart 所说，一次 OnSubscriptionError发生您无法重新打开连接...

这是您可以使用的代码片段

private void OnSubscriptionError(object sender, SubscriptionErrorEventArgs args)
{
    connection = (StreamingSubscriptionConnection)sender;
    //Log here
    if (args.Subscription != null)
    {
        try
        {
            connection.RemoveSubscription(args.Subscription);
        }
        catch (Exception removeSubscriptionException)
        {
            //Log Here
        }
     }
     if (connection != null && connection.IsOpen)
     {
         try
         {
             connection.Close();
         }
         catch (Exception subscriptionCloseException)
         {
             //Log Here
         }
      }
      Subscription =_exchangeService.SubscribeToStreamingNotifications(
             new FolderId[] { WellKnownFolderName.Inbox },EventType.NewMail);
      CreateStreamingSubscription(_exchangeService, Subscription);
}