c# - EWS 托管 API 拉取通知以查看新电子邮件不起作用

Question

我正在创建一个应用程序，它将在后台充当窗口服务。该应用程序将解析收件箱中的新电子邮件并保存附件。我尝试过流式通知，但由于连接在 30 分钟后断开，我想使用拉取通知。下面是我调试的代码，但我在控制台上看不到任何输出。一旦我运行应用程序，它就会关闭控制台窗口，因此不知道它是否正常工作。我希望在新电子邮件进入收件箱后立即查看它，因此需要一些指导如何实现这一目标。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Exchange.WebServices.Data;
using System.Configuration;
using System.Timers;

namespace PullNotification
{
    class Program
    {
        static void Main(string[] args)
        {
            ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
             WebCredentials wbcred = new WebCredentials(ConfigurationSettings.AppSettings["user"], ConfigurationSettings.AppSettings["PWD"]); 
            PullSubscription SubscriptionInbox;

            service.Credentials = wbcred;
            service.AutodiscoverUrl(ConfigurationSettings.AppSettings["user-id"], RedirectionUrlValidationCallback);


            SubscriptionInbox = service.SubscribeToPullNotifications(new FolderId[] { WellKnownFolderName.Inbox }, 5/* subcription will end if the server is not polled within 5 mints*/, null/*to start a new subcription*/, EventType.NewMail, EventType.Modified);
            //Timer myTimer = new Timer();
            //myTimer.Elapsed += new ElapsedEventHandler(GetPullNotifications);
            //myTimer.Interval = 10000;
            //myTimer.Start();


            GetEventsResults events = SubscriptionInbox.GetEvents();
            EmailMessage message;

            foreach (ItemEvent itemEvent in events.ItemEvents)
            {
                switch (itemEvent.EventType)
                {
                    case EventType.NewMail:
                        try
                        {
                            Item item = Item.Bind(service, itemEvent.ItemId);
                            if (item.Subject == "A123")
                            {
                                Console.WriteLine("check the code");
                            }
                        }
                        catch (Exception e)
                        {
                            Console.WriteLine("error=" + e.Message);
                        }
                        break;
                    case EventType.Deleted:
                        Item item1 = Item.Bind(service, itemEvent.ItemId);
                        Console.WriteLine("Mail with subject" + item1.Subject + "--is deleted");
                        break;
                }
            }
            //Loop 




               }





        internal static bool RedirectionUrlValidationCallback(string redirectionUrl)
        {
            //The default for the validation callback is to reject the URL
            bool result=false;

            Uri redirectionUri=new Uri(redirectionUrl);
            if(redirectionUri.Scheme=="https")
            {
                result=true;
            }
            return result;
        }   



    }
}

Answer 1

当您想要更新时，拉取通知要求您发出拉取请求(通过 GetEvents)。https://msdn.microsoft.com/en-us/library/office/dn458791%28v=exchg.150%29.aspx 中描述了通知方法之间的差异。您的代码没有循环，仅发出一个 GetItem 请求，这就是为什么它的行为方式与您描述的正常情况相同。

I want watch the new email as soon as it enters in the inbox so need some guidance how to achieve that.

如果您希望服务器在电子邮件到达时通知您，那么您需要查看推送或流通知 拉取通知要求您轮询服务器以获取更新。

I tried streaming notification but as the connection disconnects after 30 mints

这很正常，您只需要代码来重新连接和管理订阅，请参阅 http://blogs.msdn.com/b/emeamsgdev/archive/2013/04/16/ews-streaming-notification-sample.aspx一个好的样本。

干杯格伦