VB.NET Google Calendar API - Event Get (GetRequest) failing - vb.net

Question

What I'm attempting to do should be SO easy. Here's my question:
Using VB.NET (If you do C# that's cool too.) with the Google Calendar API, upon a simple GetRequest for one event, with four measly lines of code as shown below, why on earth am I getting
Message[Not Found] Location[ - ] Reason[notFound] Domain[global]
Private Function GetEvent(ByVal CalID As String, ByVal EventID As String) As [Event]
Dim service As CalendarService = GetCalendarService()
Dim request As EventsResource.GetRequest = service.Events.Get(CalID, EventID)
Dim ThisEvent As [Event] = request.Execute()
Return ThisEvent
End Function
It seems this should be easy... I can already retrieve a list of all my calendars, lists of events from any calendar, and I can insert events into any calendar. All of that is working great. I almost thought I knew what I was doing, until this cropped up.
Since I think the reader may be inclined to point to scope, proper credentials, or that my EventID and CalendarID don't match up, those aren't it. The EventID and the CalendarID were both obtained from a previous event ListRequest.
I'm aware that I could "cheat" and use an event ListRequest (since I'm doing that successfully) to get just the one event, but that's not the proper way to go about it and I'm pretty sure a GetRequest (using EventID) will be faster. I only want the one event.
Any guidance would be much appreciated.

Answer 1

I have to be honest, I don't know how I solved it. I decided to start a whole new project from scratch to test all of the features of the API I have tried so far:
Getting a list of calendars
Getting Lists of events within calendars
Inserting events
And (what failed before) a get request. ...which now works.
WHY it works and it didn't before, I still have no idea. The problem must be elsewhere in my project where it fails, but I'll find it.
For those who may find it helpful (there are very few VB examples out there), make a new project with Form1, add four buttons, a textbox, and a combobox with their default names.
So here's the code:
Imports System.IO
Imports System.Threading
Imports Google.Apis.Auth.OAuth2
Imports Google.Apis.Calendar.v3
Imports Google.Apis.Calendar.v3.Data
Imports Google.Apis.Services
Imports Google.Apis.Util.Store
Imports System.Windows.Forms
Public Class Form1
Private Shared Scopes() As String = {CalendarService.Scope.CalendarEvents, CalendarService.Scope.CalendarReadonly} ', CalendarService.Scope.Calendar}
'If I ever need to create calendars, or read them
Private objCalendars As Data.CalendarList '///Holds all calendars.
Private selectedCalendarID As String = "" '//Holds the currently selected Calendar ID.
Private Const calendarTimeZone = "America/Los_Angeles"
'Both of these are for testing purposes.
Dim TestEventID As String = ""
Dim TestCalendarID As String = "primary"
Private Function GetCalendarService() As CalendarService
Dim credential As UserCredential
Using stream = New FileStream("credentials.json", FileMode.Open, FileAccess.ReadWrite)
Dim credPath As String = "token.json"
credential = GoogleWebAuthorizationBroker.AuthorizeAsync(GoogleClientSecrets.Load(stream).Secrets, Scopes, "user", CancellationToken.None, New FileDataStore(credPath, True)).Result
End Using
Return New CalendarService(New BaseClientService.Initializer() With {.HttpClientInitializer = credential})
End Function
Private Sub LoadCalendars()
Dim service As CalendarService = GetCalendarService()
Dim objCalendarListRequest As CalendarListResource.ListRequest = service.CalendarList.List
objCalendars = objCalendarListRequest.Execute()
If objCalendars Is Nothing Or objCalendars.Items.Count = 0 Then
'** No calendars. Something is wrong. Give up and die.
MsgBox("No calendars found? That's weird.")
End
Else
ComboBox1.Items.Clear()
ComboBox1.Items.Add("primary")
For Each objCal As Data.CalendarListEntry In objCalendars.Items
Console.WriteLine(objCal.Summary)
ComboBox1.Items.Add(objCal.Summary)
Next
ComboBox1.SelectedIndex = 0
End If
End Sub
Private Function GetCalendarIDFromSummary(ByVal Summary) As String
If Summary = "primary" Then Return Summary
If objCalendars IsNot Nothing AndAlso objCalendars.Items.Count > 0 Then
For Each objCal As Data.CalendarListEntry In objCalendars.Items
If objCal.Summary = Summary Then
Return objCal.Id
End If
Next
End If
Return "" 'Should have found a match if objCalendars was properly loaded.
End Function
Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles Button1.Click
Call LoadCalendars()
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim summary As String = "Hello World"
If Trim(TextBox1.Text) <> "" Then summary = Trim(TextBox1.Text)
Call InsertEvent(summary, "1600 Pennsylvania Avenue NW, Washington, DC 20500", "My Description of this event.", Now, 60, GetCalendarIDFromSummary(ComboBox1.SelectedItem.ToString))
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
If TestEventID <> "" Then
MsgBox(GetEvent(TestCalendarID, TestEventID).Summary)
End If
End Sub
Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
Call SearchEvents()
End Sub
Private Sub SearchEvents()
Me.Cursor = Cursors.WaitCursor
Dim EventCount As Integer = 0
Dim service As CalendarService = GetCalendarService()
If objCalendars IsNot Nothing AndAlso objCalendars.Items.Count > 0 Then
For Each objCal As Data.CalendarListEntry In objCalendars.Items
If InStr(objCal.Description, "#") = 1 Then 'OPTIONAL: I decided adding this character in the first postion of the description of the calendar is a flag to indicate we search it.
Console.WriteLine("***NEW CALENDAR***: " & objCal.Summary)
Dim request As EventsResource.ListRequest = service.Events.List(objCal.Id)
If TextBox1.Text <> "" Then request.Q = Trim(TextBox1.Text)
request.SingleEvents = True
request.OrderBy = EventsResource.ListRequest.OrderByEnum.StartTime
Dim events As Events = request.Execute()
If events.Items IsNot Nothing AndAlso events.Items.Count > 0 Then
For Each eventItem In events.Items
If eventItem.Start.DateTime IsNot Nothing Then
Dim DateToShow As String = Format(eventItem.Start.DateTime, "MMM dd, \'yy hh:mmtt")
Console.WriteLine(DateToShow & ":" & eventItem.Summary & " > EventID: " & eventItem.Id & " > CalID:" & objCal.Id)
End If
EventCount += 1
Me.Text = EventCount.ToString
Next eventItem
End If
End If
Next objCal
End If
Me.Cursor = Cursors.Default
MsgBox("Total items: " & EventCount.ToString)
End Sub
Private Sub InsertEvent(ByVal Summary As String, ByVal Location As String, ByVal Description As String, ByVal StartDateTime As DateTime, ByVal DurationMinutes As Integer, ByVal CalendarID As String)
Dim service As CalendarService = GetCalendarService()
Dim newEvent As New [Event]() With {
.Summary = Summary,
.Location = Location,
.Description = Description,
.Start = New EventDateTime() With {.DateTime = StartDateTime, .TimeZone = calendarTimeZone},
.End = New EventDateTime() With {.DateTime = DateAdd(DateInterval.Minute, DurationMinutes, StartDateTime), .TimeZone = calendarTimeZone}
}
Dim request As EventsResource.InsertRequest = service.Events.Insert(newEvent, CalendarID)
Dim createdEvent As [Event] = request.Execute()
TestEventID = createdEvent.Id
TestCalendarID = CalendarID
Console.WriteLine("Event created:", createdEvent.Id)
End Sub
Private Function GetEvent(ByVal CalID As String, ByVal EventID As String) As [Event]
Dim service As CalendarService = GetCalendarService()
Dim request As EventsResource.GetRequest = service.Events.Get(CalID, EventID)
Dim ThisEvent As [Event] = request.Execute()
Return ThisEvent
End Function
End Class

Answer 2

Solution
If you take a look at the implementation of the Events.Get method you will see that the parameters are passed in the opposite way: first calendarId, then eventId
/// <summary>Returns an event.</summary>
/// <param name="calendarId">Calendar identifier. To retrieve calendar IDs call the calendarList.list method. If you
/// want to access the primary calendar of the currently logged in user, use the "primary" keyword.</param>
///
/// <param name="eventId">Event identifier.</param>
public virtual GetRequest Get(string calendarId, string eventId)
{
return new GetRequest(service, calendarId, eventId);
}
Reference
.NET Google Client API