Suppression d'événements d'agenda avec Microsoft Graph - Pourquoi dois-je appeler plusieurs fois?

Question

Après beaucoup de recherches et les tests bêta Je suis venu avec l'approche suivante pour supprimer des événements de calendrier:

public async Task<bool> DeleteCalendarEvents(SettingsBase oSettings, string valueProperty1, string valueProperty2) 
{ 
    string strFilterDateRange = String.Format("start/dateTime ge '{0}T00:00' and end/dateTime le '{1}T23:59'", 
    oSettings.StartDate.ToString("yyyy-MM-dd"), 
    oSettings.EndDate.ToString("yyyy-MM-dd")); 

    // Filter the events on the TruckleSoft1 property 
    string strFilterProperty1 = $"singleValueExtendedProperties/Any(ep: ep/id eq '{SettingsBase.Property_TruckleSoft1}' and ep/value eq '{valueProperty1}')"; 

    // Build the filter 
    string strFilter = $"{strFilterDateRange} and {strFilterProperty1}"; 

    // Filter the events on the TruckleSoft2 property (this is optional) 
    if (valueProperty2 != "") 
    { 
     string strFilterProperty2 = $"singleValueExtendedProperties/Any(ep: ep/id eq '{SettingsBase.Property_TruckleSoft2}' and ep/value eq '{valueProperty2}')"; 

     // Update the filter 
     strFilter += $" and {strFilterProperty2}"; 
    } 


    var oCalendar = await _graphClient.Me.Calendars[oSettings.CalendarID].Request().GetAsync(); 
    string strName = oCalendar.Name; 


    var oEvents = await _graphClient 
          .Me 
          .Calendars[oSettings.CalendarID] 
          .Events 
          .Request() 
          .Filter(strFilter) 
          .OrderBy("start/DateTime") 
          .GetAsync(); 

    Program.file.WriteLine($"Calendar {strName}"); 
    int iPage = 0, iTotal = 0, iLoop = 0; 
    bool bDeleted = false; 

    do 
    { 
     iLoop++; 

     if (oEvents?.Count > 0) 
     { 
      iPage++; 

      foreach(Event oEvent in oEvents) 
      { 
       Program.file.WriteLine($"Loop {iLoop} Page {iPage} Count {oEvents.Count.ToString()} Event Data: {oEvent.Start.DateTime} Id: {oEvent.Id} Subject: {oEvent.Subject}"); 
       await _graphClient.Me.Events[oEvent.Id].Request().DeleteAsync(); 
       bDeleted = true; 
      } 

      iTotal += oEvents.Count; 
     } 

     if (oEvents.NextPageRequest != null) 
      oEvents = await oEvents.NextPageRequest.GetAsync(); 
     else 
     { 
      oEvents = null; 
     } 
    } while (oEvents != null); 

    Program.file.WriteLine($"Count: {iTotal}" + Environment.NewLine); 

    return bDeleted; 
} 

Cependant, les besoins ci-dessus à appeler comme ceci:

bool bContinue = await oOutlook.DeleteCalendarEvents(_DataSRR.SettingsSRR, _DataSRR.SettingsSRR.CalendarEntryType, _DataSRR.SettingsSRR.ScheduleType); 
while(bContinue) 
    bContinue = await oOutlook.DeleteCalendarEvents(_DataSRR.SettingsSRR, _DataSRR.SettingsSRR.CalendarEntryType, _DataSRR.SettingsSRR.ScheduleType); 

Les résultats en mon journal:

Calendar Test 5 
Loop 1 Page 1 Count 10 Event Data: 09/21/2017 19:15:00 Id: AA== Subject: Midweek Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 09/24/2017 13:00:00 Id: AA== Subject: Weekly Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 09/28/2017 19:15:00 Id: AA== Subject: Midweek Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 10/01/2017 13:00:00 Id: AA== Subject: Weekly Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 10/05/2017 19:15:00 Id: AA== Subject: Midweek Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 10/08/2017 13:00:00 Id: AA== Subject: Weekly Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 10/12/2017 19:15:00 Id: AA== Subject: Midweek Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 10/15/2017 13:00:00 Id: AA== Subject: Weekly Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 10/19/2017 19:15:00 Id: AA== Subject: Midweek Meeting Duty Assignments 
Loop 1 Page 1 Count 10 Event Data: 10/22/2017 13:00:00 Id: AA== Subject: Weekly Meeting Duty Assignments 
Count: 10 

Calendar Test 5 
Loop 1 Page 1 Count 2 Event Data: 10/26/2017 19:15:00 Id: AQ== Subject: Midweek Meeting Duty Assignments 
Loop 1 Page 1 Count 2 Event Data: 10/29/2017 13:00:00 Id: AQ== Subject: Weekly Meeting Duty Assignments 
Count: 2 

Calendar Test 5 
Count: 0 

Comme vous pouvez le voir, je dois faire mon appel plusieurs fois. Finalement, il efface tous les événements convenus. Mais pourquoi ne peut-il pas le faire avec une itération?

Answer 1

Si j'utilise l'option $top je peux ajuster la taille des pages et réduire ainsi le nombre d'appels que je dois faire:

List<QueryOption> listQueryOptions = new List<QueryOption>() 
{ 
    new QueryOption("$top", "50") 
}; 

var oEvents = await _graphClient 
         .Me 
         .Calendars[oSettings.CalendarID] 
         .Events 
         .Request(listQueryOptions) 
         .Filter(strFilter) 
         .OrderBy("start/DateTime") 
         .GetAsync(); 

Cela peut être simplifié que d'autres:

var oEvents = await _graphClient 
         .Me 
         .Calendars[oSettings.CalendarID] 
         .Events 
         .Request() 
         .Top(50) 
         .Filter(strFilter) 
         .OrderBy("start/DateTime") 
         .GetAsync(); 

Cette resource était très pratique. À la fin j'ai:

public async Task<bool> DeleteCalendarEvents(SettingsBase oSettings) 
{ 
    try 
    { 
     var oEvents = await _graphClient 
           .Me 
           .Calendars[oSettings.CalendarID] 
           .Events 
           .Request() 
           .Select("Start,Subject,Id") // TODO: Is there any point doing this? 
           .Top(50) 
           .Filter(oSettings.GetFilterString()) 
           .OrderBy("start/DateTime") 
           .GetAsync(); 

     List<Event> listEvents = new List<Event>(); 

     listEvents.AddRange(oEvents); 
     while(oEvents.NextPageRequest != null) 
     { 
      oEvents = await oEvents.NextPageRequest.GetAsync(); 
      listEvents.AddRange(oEvents); 
     } 

     foreach(Event oEvent in listEvents) 
     { 
      await _graphClient.Me.Events[oEvent.Id].Request().DeleteAsync(); 
     } 

    } 
    catch(Exception ex) 
    { 
     SimpleLog.Log(ex); 
     Console.WriteLine("DeleteCalendarEvents: See error log."); 
     return false; 
    } 

    return true; 
}