Bug 25231 - [iOS] 'AddMinutes' method is missing in NSDate Class after migrating sample by Xamarin.Mac Migration API tool.
Summary: [iOS] 'AddMinutes' method is missing in NSDate Class after migrating sample b...
Alias: None
Product: iOS
Classification: Xamarin
Component: Samples ()
Version: XI 8.6.0
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: Untriaged
Assignee: GouriKumari
Depends on:
Reported: 2014-12-10 09:55 UTC by Shruti
Modified: 2014-12-11 15:56 UTC (History)
5 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Shruti 2014-12-10 09:55:00 UTC

Comment 2 Sebastien Pouliot 2014-12-10 19:18:37 UTC
There never was a AddMinutes method on NSDate, even in classic. However there's one on .NET DateTime [1].

What happens is that we replaced the implicit cast with an explicit cast (because it's not always a lossless conversion).

That means you cannot do:

   NSDateTime dt = NSDateTime.Now.AddMinutes (x);

anymore. You need to do:

  NSDateTime dt = (NSDateTime) ((DateTime) NSDateTime.Now).AddMinutes (x);

or something cuter to avoid extra, not really required, conversions.

  NSDateTime dt = (NSDateTime) DateTime.Now.AddMinutes (x);

That's better since (even implicit) cast means extra code (and cost) to convert between the two types.

In any case that's a sample, not a class library, issue.

[1] http://msdn.microsoft.com/en-us/library/system.datetime.addminutes%28v=vs.110%29.aspx
Comment 3 Shruti 2014-12-11 00:33:14 UTC
Thanks Sebastien for describing the cause in detail.  As per comment2 , I am closing this issue.
Comment 4 Sebastien Pouliot 2014-12-11 08:17:53 UTC
Not sure you should be closing it. Comment #2 is just a description / clarification of the issue, not that there's no issues. IOW It's still a bug in the sample that needs to be fixed. 

@PJ ?
Comment 5 PJ 2014-12-11 15:56:45 UTC
> IOW It's still a bug in the sample that needs to be fixed. 

Normally this would be true, and I appreciate you double-checking! 

The sample in question has been updated on the branch intended for stable publishing to use the explicit cast, see https://github.com/xamarin/monotouch-samples/blob/monotouch-8.6-unified-api/Calendars/Calendars/Screens/Home/HomeController.cs#L138.

In this particular case Shruti is verifying the behavior of the API while testing the migration tool, so I think we can leave it VERIFIED. If the migration tool should be able to handle this scenario, we can REOPEN the bug (and move it to XS->iOS Add-in), but it's not currently part of the expected behavior.

Thanks Shruti and Sebastien!