Bug 35304 - [tvos] ArgumentNullException calling NSUserDefaults.StandardUserDefaults from Library
Summary: [tvos] ArgumentNullException calling NSUserDefaults.StandardUserDefaults from...
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.TVOS.dll ()
Version: XI 9.3 (xcode 7.1 previews)
Hardware: Macintosh Mac OS
: --- enhancement
Target Milestone: (C7)
Assignee: Rolf Bjarne Kvinge [MSFT]
: 35638 ()
Depends on:
Reported: 2015-10-27 14:18 UTC by Vincent Roggero
Modified: 2016-01-22 15:57 UTC (History)
3 users (show)

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

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Description Vincent Roggero 2015-10-27 14:18:06 UTC
NSUserDefaults nsUD = NSUserDefaults.StandardUserDefaults;

System.ArgumentNullException: Value cannot be null.
Parameter name: obj
  at at (wrapper managed-to-native) System.Threading.Monitor:enter_with_atomic_var (object,bool&)
  at System.Threading.Monitor.Enter (System.Object obj, System.Boolean& lockTaken) [0x00000] in /Users/builder/data/lanes/2128/155d35b9/source/watch/mono/mcs/class/corlib/System.Threading/Monitor.cs:202
  at ObjCRuntime.Runtime.TryGetNSObject (IntPtr ptr, Boolean evenInFinalizerQueue) [0x00000] in /Users/builder/data/lanes/2128/155d35b9/source/maccore/src/ObjCRuntime/Runtime.cs:842
  at ObjCRuntime.Runtime.TryGetNSObject (IntPtr ptr) [0x00000] in /Users/builder/data/lanes/2128/155d35b9/source/maccore/src/ObjCRuntime/Runtime.cs:837
  at ObjCRuntime.Runtime.GetNSObject[T] (IntPtr ptr) [0x00017] in /Users/builder/data/lanes/2128/155d35b9/source/maccore/src/ObjCRuntime/Runtime.cs:877
  at Foundation.NSUserDefaults.get_StandardUserDefaults () [0x00000] in /Users/builder/data/lanes/2128/155d35b9/source/maccore/src/build/ios/native/Foundation/NSUserDefaults.g.cs:662
  at ToolsMT.LangUtil.get_CurrentLanguageCodeFull () [0x00001] in /Users/vincentr/GitHub/Tools/ToolsMT/Utils.cs:1746
  at ToolsMT.LangUtil.get_CurrentLanguageCode () [0x00001] in /Users/vincentr/GitHub/Tools/ToolsMT/Utils.cs:1735
  at ToolsMT.Extension.localize (System.String key) [0x0000d] in /Users/vincentr/GitHub/Tools/ToolsMT/Utils.cs:1976
  at ToolsMT.LangUtil.Localize (System.String key) [0x00002] in /Users/vincentr/GitHub/Tools/ToolsMT/Utils.cs:1875
  at ToolsMT.MessageBox.Show (System.String messageBoxText, System.String caption, MessageBoxButton buttonType) [0x00025] in /Users/vincentr/GitHub/Tools/ToolsMT/MessageBox.cs:40
  at ToolsMT.MessageBox.Show (System.String messageBoxText) [0x00008] in /Users/vincentr/GitHub/Tools/ToolsMT/MessageBox.cs:188
  at THXTuneup.HomeViewController.btnGetStarted (Foundation.NSObject sender) [0x00006] in /Users/vincentr/GitHub/THX-tune-up/tvOS/THXTune-up/THXTune-up/HomeViewController.cs:33
  at at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Users/builder/data/lanes/2128/155d35b9/source/maccore/src/UIKit/UIApplication.cs:74
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/2128/155d35b9/source/maccore/src/UIKit/UIApplication.cs:58
  at THXTuneup.Application.Main (System.String[] args) [0x00008] in /Users/vincentr/GitHub/THX-tune-up/tvOS/THXTune-up/THXTune-up/Main.cs:12

****Note: XS intellisense and Immediate window will resolve properly;
> NSUserDefaults.StandardUserDefaults
{<NSUserDefaults: 0x7fce89e127b0>}
	Class: {ObjCRuntime.Class}
	ClassHandle (Foundation.NSUserDefaults): 0x10b820f30
	ClassHandle (Foundation.NSObject): 0x10b820f30
	DebugDescription: "<NSUserDefaults: 0x7fce89e127b0>"
	Description: "<NSUserDefaults: 0x7fce89e127b0>"
	Handle: 0x7fce89e127b0
	IsProxy: false
	RetainCount: 7
	Self: {<NSUserDefaults: 0x7fce89e127b0>}
	SuperHandle: 0x11a1fdbf8
	Superclass: {ObjCRuntime.Class}
	Zone: {Foundation.NSZone}
	Static members: 
	Non-public members:
Comment 1 Vincent Roggero 2015-10-27 14:27:17 UTC
=== Xamarin Studio ===

Version 5.10 (build 913)
Installation UUID: 5df374dd-127a-4b3e-bfa6-0a872d52b886
	Mono 4.0.4 ((detached/d481017)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 400040004

=== Xamarin.Profiler ===

Not Installed

=== Apple Developer Tools ===

Xcode 7.1 (9079)
Build 7B91b

=== Xamarin.Mac ===

Version: (Starter Edition)

=== Xamarin.iOS ===

Version: (Business Edition)
Hash: 155d35b
Branch: master
Build date: 2015-09-30 18:26:52-0400

=== Xamarin.Android ===

Version: (Business Edition)
Android SDK: /Users/vincentr/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		2.3   (API level 10)
		4.0.3 (API level 15)
		4.4   (API level 19)
		5.0   (API level 21)

SDK Tools Version: 24.1.2
SDK Platform Tools Version: 22.0.0
SDK Build Tools Version: 22.0.1

Java SDK: /usr
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

=== Xamarin Android Player ===

Not Installed

=== Build Information ===

Release ID: 510000913
Git revision: d437b9453df0bd08103df76b60a2bb95c3a864a6
Build date: 2015-09-30 16:56:55-04
Xamarin addins: 2c839fd62864efbeb8d02091e4ba3dfde24a099a
Build lane: monodevelop-lion-xcode7.1

=== Operating System ===

Mac OS X 10.10.5
Darwin Vincents-iMac.local 14.5.0 Darwin Kernel Version 14.5.0
    Wed Jul 29 02:26:53 PDT 2015
    root:xnu-2782.40.9~1/RELEASE_X86_64 x86_64
Comment 2 Sebastien Pouliot 2015-11-09 21:03:10 UTC
This sounds very similar to but #35638.

Unit tests works fine for that call and the location of the stack trace (Monitor.cs) looks incorrect. Can you provide us with a test case that can reproduce this issue, even if a bit randomly ? Thanks
Comment 3 Sebastien Pouliot 2015-12-01 13:44:07 UTC
Were you able to track down why this happened ? or how you solved it ?
Comment 4 Vincent Roggero 2015-12-01 15:23:56 UTC
I believe the issue was due to my library using Xamarin.iOS.
To resolve this issue I've created a tvOS library, linked the source files from the iOS library, and added #if compiler directives when building for iOS vs tvOS.
Comment 5 Sebastien Pouliot 2016-01-11 17:49:07 UTC
*** Bug 35638 has been marked as a duplicate of this bug. ***
Comment 6 Sebastien Pouliot 2016-01-11 17:51:00 UTC
@Rolf, wrt comment #4 can you check that we do not allow two platform assemblies being referenced. I'm sure we had that for monotouch.dll/Xamarin.iOS.dll but maybe not for the new tv/watch platforms.
Comment 7 Rolf Bjarne Kvinge [MSFT] 2016-01-22 15:57:14 UTC
Fixed mtouch to detect (and show an error) any incorrect platform assembly, not just monotouch.dll vs Xamarin.iOS.dll

maccore/master: 76aa5761ac84b3587fcfea91690ffd87cdfd1013