EWS错误：超过了1000个项目的最大数量，可以在一个请求中将其删除

Question

我正在使用EWS Exchange Sync，在我的一种方法中，这就是说我超出了可以在单个请求中删除的1000个项目的最大数量。是否可以解决此问题，而不是从日历中删除所有内容，而只从今天起删除，而不是及时删除？

导致错误的方法在这里：

        public void DeleteAllSafeAppointments(SCDriftConnection conn, ExchangeService service, SAFEAgent agent) {

        if(conn == null)

            throw new ArgumentNullException("conn");

        if(service == null)

            throw new ArgumentNullException("service");

        if(agent == null)

            throw new ArgumentNullException("agent");

        try {

            var calendar = GetAgentCalendar(service, agent);

            service.DeleteItems(GetAllSafeAppointments(calendar).Select(a => a.Id), DeleteMode.HardDelete, SendCancellationsMode.SendToNone, null);

            var scheduledActivitiesOnAgent = ScheduledActivity.GetScheduleToExchange(new QueryParameters<ScheduledActivity>(s => s.Initials == agent.Initials && s.ExchangeId != null));

            foreach(var schedAct in scheduledActivitiesOnAgent) {

                schedAct.ExchangeId = null;

                schedAct.Save(conn);

            }

            ResetAgentSyncState(calendar, agent);

        } catch(Exception ex) {

            throw new Exception("An error occured while clearing exchange calendar for " + agent.Initials, ex);

        }

        agent.ExchangeSyncronizationSettings.LastSync = DateTime.Now;

        agent.ExchangeSyncronizationSettings.Save(conn);

    }

Answer 1

private IEnumerable<Appointment> GetAllSafeAppointments(Folder calendar) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ItemView view = new ItemView(512);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; view.PropertySet = new PropertySet(BasePropertySet.IdOnly);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SearchFilter filter = new SearchFilter.SearchFilterCollection(LogicalOperator.And,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new SearchFilter.IsEqualTo(SafeAppointmentFlag, true));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; while(true) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; var results = SendExchangeRequest(() => calendar.FindItems(filter, view));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foreach(var r in results.OfType<Appointment>())&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; yield return r;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(!results.MoreAvailable)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; view.Offset = results.NextPageOffset.Value;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }

Answer 2

您可以批量处理请求。我为此编写了一个通用批处理方法：private IEnumerable<IEnumerable<T>> Batch<T>(IEnumerable<T> input, int batchSize){&nbsp; &nbsp; List<T> items = new List<T>();&nbsp; &nbsp; foreach (var item in input)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; items.Add(item);&nbsp; &nbsp; &nbsp; &nbsp; if (items.Count == batchSize)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; yield return items;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; items = new List<T>();&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; if (items.Count > 0)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; yield return items;&nbsp; &nbsp; }}现在，您可以使用它将您的物品分成几批：var batches = Batch(GetAllSafeAppointments(calendar).Select(a => a.Id), 1000);foreach (var batch in batches){&nbsp; &nbsp; service.DeleteItems(batch, DeleteMode.HardDelete, SendCancellationsMode.SendToNone, null);}现在最多一次将删除1000个。