exchange-server - 是什么原因导致EWS API的StreamingSubscriptionConnection中引发OnSubscriptionError？

我在生产中遇到此错误。不知道到底是什么原因造成的。

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

现在，我想在开发环境中模拟行为。

我已订阅事件Connection.OnSubscriptionError，我的事件处理程序是OnSubscriptionError。现在，我要测试处理程序。为此，我想要某种触发事件的方法，我很难解决。

我试图在应用程序运行时关闭Exchange主机服务，但这不会触发OnsubscriptionError Event。

我想知道触发OnsubscriptionError event时以下代码是否有效。还是在创建连接之前必须重新创建Subscription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)
    { }
 }

最佳答案

我实现了与您类似的机制，但无需调用Connection.Open();，而是需要重新启动整个订阅...因为正如我上面所说的@BraveHeart所说，一旦OnSubscriptionError出现，您就无法重新打开连接...

这是您可以使用的代码段

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);
}

关于exchange-server - 是什么原因导致EWS API的StreamingSubscriptionConnection中引发OnSubscriptionError？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/16579638/