c#-在EWS中使用StreamingSubscriptionConnection时自动重新连接

我创建了一个小应用程序,可以使用EWS托管dll监视收件箱.

当我创建StreamingSubscriptionConnection时,我传递了1分钟的断开连接.

然后在断开连接事件处理程序中,我睡了45秒钟,然后重新连接.

如果在45秒的睡眠时间内将任何内容发送到收件箱,它最初看上去就像是醒来并正确触发了NotificationEventDelegate.但是,经过一些测试,当收到多封电子邮件时,它似乎会对同一封电子邮件多次触发.

如果我不睡觉,那么我就不会有这个问题.所以我的问题是,为什么NotificationEventDelegate在重新连接时无法正常运行,并且立即重新连接是否存在问题？

我的代码如下

private MailDirectorServer()
{
    _isRunning = false;

    ExchangeService _service = new ExchangeService()
    {
        Credentials = new WebCredentials(userName, password),
        Url = new Uri(uriAddress)
    };

    _connection = 
        new StreamingSubscriptionConnection(_service, 1);

    // set up subscriptions here.
    _connection.OnNotificationEvent +=
                new StreamingSubscriptionConnection.NotificationEventDelegate(OnNewMail);

    _connection.OnDisconnect +=
        new StreamingSubscriptionConnection.SubscriptionErrorDelegate(OnDisconnect);

    _connection.Open();
    _isRunning = true;
}

private void OnDisconnect(object sender, SubscriptionErrorEventArgs args)
{
    while (true)
    {
        if (_isRunning)
        {
            //_logger.Debug("Sleeping for 45 seconds");
            //Thread.Sleep(new TimeSpan(0, 0, 45));
            _connection.Open();
            _logger.Info("Connection Re Opened");
            break;
        }
        else
        {
            _logger.Info("Closing Down");
            break;
        }
    }
}

解决方法:

删除Sleep呼叫-只需立即重新连接(connection.Open).请参阅related SO post.Microsoft也为recommends this process of automatic reconnect in their forums.

我还将断开间隔延长到30分钟,以避免持续打开和关闭连接.断开一分钟后,您可能还会使用Pull Subscriptions.

您还应处理OnSubscriptionError,以在流式传输订阅出现错误时进行捕获.

标签：exchangewebservices,ews-managed-api,c
来源： https://codeday.me/bug/20191127/2076771.html